2colorthresh --- Automatically thresholds an image to binary (b/w) format using an adaptive spatial subdivision color reduction technique. 3Dbox --- Generates a perspective view of a 3D box at any orientation with pictures pasted on each of its sides 3Dcover --- Wraps an image around the front and left or right side of box viewed in rotated perspective. 3Dreflection --- Adds a fading reflection below an image and views it in perspective. 3Drotate --- Applies a perspective distortion to an image by providing three rotation angles, zoom, offsets, background color, perspective exaggeration and auto zoom/centering 3Dtext --- Converts text into an image with a 3D extrusion effect. accentedges --- Applies accented edges to an image. adaptivegamma --- Enhances the contrast/brightness in an image using a locally adaptive gamma method. adjoin --- Appends multiple images together with positional justification. anglegradient --- Creates a gradient effect at a specific orientation angle. aspect --- Resizes an image to a specific size allowing either cropping or padding to deal with the aspect ratio change. aspectcrop --- Crops an image to a specified aspect ratio. aspectpad --- Pads an image with a color to a specified aspect ratio and orientation. autocaption --- Places text automatically in a specified square size region that has the least color variation. autocolor --- Automatically color balances an image. autogamma --- Modifies an image to automatically apply a gamma correction. autolabel --- Places text automatically in a specified size region that best matches a reference color. autolevel --- Modifies an image to automatically stretch the dynamic range between full black and white and automatically apply a gamma correction. autotone --- Automatically tone balances an image. autotone2 --- Automatically tone balances an image. autotrim --- Automatically trims the background border around a normally oriented or rotated image. autowhite --- Automatically adjusts the white balance of an image. balance --- Enhances the shadows, midtones and highlight regions of the image. bcimage --- Changes the brightness, contrast and/or saturation of an image. bcmatch --- Modifies one image to try to match its brightness, contrast and optionally saturation to that of another image. bevel --- Applies an inner bevel or outer bevel or emboss effect to an image. bevelborder --- Applies a bevel effect to border of an image. bilinearwarp --- Generates a proper four-point bilinear warp of the input image. binomial --- Generates high pass or low pass filtered images based upon convolution kernels whose weights are derived from the binomial coefficients binomialedge --- Sharpens (or blurs) an image near edges using a Binomial shaped filter. bokeh --- Applies a bokeh blurring effect to an image. bordereffects --- Creates various dispersion-like effects in the border of an image. bordergrid --- Creates various grid effects in the border of an image. bubblewarp --- Applies or reverses a warp of an image onto a bubble. bump --- Applies a hemispherical-like bump distortion to an image. bumptext --- Applies a raised text effect onto an image. camerablur --- Blurs an image in the frequency domain using an ideal blurring filter for either motion blur or lens defocus. cameradeblur --- Deblurs an image in the frequency domain using an ideal deblurring filter for either motion blur or lens defocus. captcha --- Creates a six-alphanumeric-character image for use as a challenge response test. cartoon --- Creates a cartoon-like appearance to an image. centertrim --- Trims an image so as to preserve the image center. cepstrum --- Creates the cepstrum to depict the type, amount and orientation of camera type blurring in an image. chrome --- Applies a chrome effect to a binary image. clip --- Stretches the channels of an image to full black and white according to a clip amount on each end of the histogram. collage --- Creates a multi-variant collage of the input image. color2alpha --- Creates a ramped alpha channel from the input image according to the specified color. color2gray --- Mixes the color channels from an image into a grayscale image using a weighted combination. coloration --- Mixes the color channels from an image into a grayscale image and then tints it. colorbalance --- Manually color balances an image in midtones, highlights, shadows or overall. colorbalance2 --- Manually color balances an image in midtones, highlights, or shadows. colorboost --- Enhances the color in an under saturated image. colorcells --- Randomly modifies the color of rectangular cells of an image. colorconverter --- To convert any valid ImageMagick color specification to the other ImageMagick color representations. colorcoords --- Locates in the image the first location and/or last location for the closest pixel within the fuzz value to the color specified. colorfilter --- Applies a photographic color filter to an image. colorfulness --- Computes a metric that represents the colorfulness of an image. colorglow --- Applies a color glow effect to an image. colorspectrum --- Generates a spectrum-like image from the colors in an image. colortemp --- Transforms an image's overall color balance according to a desired color temperature change. colortoning --- Color tones an image in highlights and/or shadows and/or overall. cone --- Draws a cone-shaped object on an image. conformal --- Applies a conformal mapping to an image. contour --- Applies a contour outline to the image content. corners --- Detects corner structures in an image. cosinebell --- Creates a cosine-bell-shaped tapered alpha channel in an image and optionally blends the image into a background image. crosshatch --- Applies a crosshatch effect to an image. crossprocess --- Applies a color crossprocessing effect to an image. crystallize --- Creates random crystal-like regions in an image. cube2sphericalpano --- Transforms 6 cube face images into a spherical panorama image. cumhist --- Creates the combined grayscale cumulative histogram of one or more images. curves --- Generate a smoothly interpolated, curved mapping look up table from a set of break points and applies it to an image. cylinderize --- Applies a cylinder distortion to an image so that the image is wrapped about the cylinder. cylinderwarp --- Applies a cylinder distortion to an image using a displacement map and arguments provided by the script cylinderize. davehilleffect --- Applies a DaveHill-like effect to an image. defisheye --- Corrects for fisheye distortion in an image. denoise --- Reduces the noise in an image. derivative --- Applies a first directional derivative filter to an image. diagcollage --- Collages three images in a diagonal orientation. dice --- Randomly rotates each successive square-sized patch in the image. disperse --- Applies a dispersion effect to an image. dog --- Create an edge extracted image using the difference of two Gaussian blurs. dominantcolor --- Finds the dominant color in an image. dotproductcorr --- Computes the dot product correlation surface to find where a small image best matches within a larger image. downsize --- Downsizes (reduces) an image to a specified file size. draganeffect --- Applies a Dragan-like effect to an image to enhance wrinkles creating a 'gritty' effect. dualtonemap --- Enhances the shadows and/or highlight regions in an image. duotonemap --- Enhances the shadows and/or highlight regions in an image. edgefx --- Extracts the edges in an image and optionally composes them with the image to create interesting effects. edges --- Applies edge extraction to image. emboss --- Applies an emboss effect to an image. embroidery --- Applies an embroidery effect to each color in an image. endpoints --- Applies a Photoshop-like curves operation on an image that only adjusts the linear endpoints. enhancelab --- Applies brightness/contrast/colorization enhancement on an image via LAB colorspace. enrich --- Enhances an image by high pass filtering and composition. entropy --- Computes the normalized entropy of an image channel-by-channel. exposure --- Changes the exposure level of an image. feather --- Feathers (smoothes) the white-to-black transition in a binary mask image. fftconvol --- Performs convolution on an image in the frequency domain. fftdeconvol --- Performs deconvolution on an image in the frequency domain. fftfilter --- Performs filtering on an image in the frequency domain. filmgrain --- Applies film grain noise to an image. fisheye --- Applies a fisheye distortion to an image. fisheye2pano --- Generates a strip panoramic image from a linear type fisheye image with optional vertical perspective correction. fisheye2rect --- Generates a perspective (rectilinear) image from a region of a vertically viewed fisheye image. flicker --- Displays and optionally save an animation of the input images. flickerchannel --- Displays and optionally save an animation of the channels in an image. frosted --- Applies a frosted glass effect to an image. furrowed --- Applies a furrowed-looking effect to an image to enhance wrinkles creating a "gritty" look. fuzzythresh --- Automatically thresholds an image to binary (b/w) format using the fuzzy c-means technique. fxtransitions --- Creates an animated transition between two images using a special effect distortion. gaussian --- Generates high pass or low pass filtered images based upon a Gaussian shaped convolution. gaussianedge --- Sharpens (or blurs) an image near edges using a Gaussian shaped filter. glasseffects --- Modifies an image so that it appears to be viewed through textured and/or tiled glass. glow --- Creates a glowing effect in an image. gradient --- Applies a gradient filter to an image. graytoning --- Mixes color channels from an image into a grayscale image and optionally tints it. greenscreen --- Removes background green color in a green screen image. grid --- Superimposes a set of horizontal and/or vertical grid lines on an image. halo --- Applies a circular halo to an image. hamming --- Computes the percent hamming distance between two binary string perceptual hashes. hexagons --- Creates a hexagonal grid of the randomly rotated input image. histcompare --- Computes one of several metrics characterizing the difference between the histograms of two images. histmatch --- Modifies one image to try to match its histogram and optionally saturation to that of another image. histog --- Generates an output image which is composed of the histograms from each channel of the input image. huemap --- Transforms the hues in an image from one range to another. houghlines --- Uses the Hough Transform technique to compute and display straight lines from a binary edge image. imageborder --- Appends an image border by extending the outer regions of the image. innercrop --- Crops an image to a rectangle that will just trim any irregularly shaped outer boundary color. interleave --- Interleaves the channels of a single image or each image of a set of multiple images. interweave --- Interleaves two images together in swaths. isodatathresh --- Automatically thresholds an image to binary (b/w) format using the isodata technique. isolatecolor --- Isolates a particular color in an image. isonoise --- Reduces isolated noise in an image. juliaset --- Creates a julia set fractal image. kaleidoscope --- Applies a kaleidoscope effect to an image. kaleidoscopic --- Applies a kaleidoscope effect to an image. kapurthresh --- Automatically thresholds an image to binary (b/w) format using Kapur's entropy technique. kmeans --- Applies k-means color reduction to an image. kmeansthresh --- Automatically thresholds an image to binary (b/w) format using the k-means technique. kneemap --- Creates a symmetric soft knee-shaped curved mapping look up table and applies it to an image. kuwahara --- Applies a Kuwahara type edge preserving noise reduction filter to an image. laplacian --- Applies a laplacian filter to an image. levelcolors --- Applies a color level transformation to an image channel-by-channel. levels --- Applies a Photoshop-like levels operation on an image. lichtenstein --- Applies a Roy Lichtenstein newspaper cartoon effect to an image. limitedtrim --- Trims an image on all sides by a maximum amount specified by the user. localthresh --- Automatically thresholds an image to binary (b/w) format using a moving window adaptive thresholding approach. locatecolors --- Modifies an image showing only those pixels which are within the specified color range. logpolar --- Applies either a rectangular (cartesian) to log-polar transformation or a log-polar to rectangular (cartesian) transformation on an image. lomography --- Applies a lomographic effect to an image. lucisarteffect --- Applies a LucisArt-like effect to an image. lupe --- Applies a magnifying glass effect in a local area of an image. magicwand --- Isolates a contiguous region of an image based upon a color determined from a user specified image coordinate. mandala --- Creates a Mandala type image from simple graphic figures. mandalascope --- Converts an image into a mandala-like kaleidoscope image. mandelbrot --- Creates a mandelbrot set fractal image. mapcolors --- Maps or translates one set of colors in an image to another set of colors. matchimage --- Matches the brightness and contrast of one image to another image. maxima --- Locates one or more local maxima in a grayscale image. maxrgb --- Converts an RGB image to keep only the channel with the maximum value at each pixel. median --- Computes the median value of an image. melt --- Creates a melting-like blur effect in an image. meshwarp --- Warps an image according to a user supplied triangular mesh. mesmerize --- Creates a mesmerizing animation from an image. midgradient --- Creates a two-color gradient with adjustable mid-color location. midtonebalance --- Color balances an image in the midtones in a manner similar to Photoshop. mirrorize --- Creates a mirror effect in an image. mode --- Computes the mode value of an image. modulatecolor1 --- Changes brightness, saturation and/or hue for any primary or secondary color in an image. modulatecolor2 --- Changes brightness, saturation and/or hue for any primary or secondary color in an image. moments --- Computes shift, scale and rotation invariant image moments as well as elliptical shape descriptors. morphology --- Performs binary or grayscale morphologic operations on an image, including dilate, erode, open and close. mosaictiles --- Applies a mosaic tiles effect to image. mottle --- Applies various mottle effects to an image. multicrop --- Crops and unrotates multiple images from a scanned image. multicrop2 --- Crops and unrotates multiple images from a scanned image. multigradient --- Creates either a linear or radial gradient image with two or more color stops. nearestcolor --- Finds the nearest color value in an image to a reference color. neg2pos - Converts from a (scanned film) negative image to a positive image. negative2positive - Converts from a (scanned film) negative image to a positive image. nightvision --- Simulates a picture as viewed through night vision goggles. noisecleaner --- Iteratively cleans noise from an image. normcrosscorr --- Computes the normalized cross correlation surface to find where a small image best matches within a larger image. notch --- Creates and applies a notch filter to an image in the frequency domain to remove dither patterns and other regular noise patterns. omnistretch --- Enhances the dynamic range of brightness values and optionally saturation values in an image ortoneffect --- Applies an Orton effect to an image. otsuthresh --- Automatically thresholds an image to binary (b/w) format using Otsu's between class variance technique. outfit --- Transforms a pattern image to place it over an image of some piece of clothing or outfit. outfitwarper --- Transforms a pattern image to place it over an image of some piece of clothing or outfit. overlapcrop --- Creates a sequence of cropped subsections permitting optional overlap of the subsections. pagecurl --- Applies a pagecurl effect to the lower right corner of an image. pagepeel --- Applies a pagepeel effect to the lower right corner of an image. painteffect --- Applies a paint type effect to an image. pano2fisheye --- Transforms a spherical panorama to a fisheye view. pano2rect --- Applies vertical perspective correction to an angular panoramic image. peelingpaint --- Applies a peeling paint effect to an image. perforations --- Applies film-like perforations to two opposite edges of an image. perlin --- Creates an image composed of Perlin type noise. phasecorr --- Computes the phase correlation surface to find where a small image best matches within a larger image. phashcompare --- Compares two 168 digit phash strings to compute a phash metric. phashconvert --- Converts the 42 phash float values for an image to a string of 168 digits. phashes --- Computes and stores one or more perceptual hashes for all provided images. picframe --- Adds a picture frame around an image. picturefold --- Applies a map-like folded appearance to an image. pinbarrel --- Applies or corrects pincushion and/or barrel lens distortion to an image. pip --- Creates a picture-in-picture effect. pixelize --- Creates a pixelized or blocky effect in an image. plm --- Generates a piece-wise linear mapping grayscale look up table and applies it to an image. plmlut --- Generates a piece-wise linear mapping grayscale look up table. plot --- Generates a profile of an image row or column or an image histogram. plot3D --- Generates a 3D plot of a single channel or grayscale image. polar --- Applies either a rectangular (cartesian) to polar transformation or a polar to rectangular (cartesian) transformation on an image. polarblur --- Applies a polar blur to an image. polyring --- Creates a polygon ring image from one or more images. popart --- Creates a pop art style image. position --- Positions (aligns) one image relative to another image. postagestamp --- Applies a perforated postage stamp like border around an image. posteredges --- Applies posterized edges to an image. profile --- Generates a profile of an image row or column. pseudocolor --- Generates a pseudocolored image or pseudocolored animation from grayscale image using a rainbow colored transformation. ptilethresh --- Automatically thresholds an image to binary (b/w) format at a specified percentile on the cumulative histogram. puzzle --- Applies a puzzle like effect to an image. quadcorners1 --- Finds the four corners of a binary quadrilateral using the intersection of Hough lines. quadcorners2 --- Finds the four corners of a binary quadrilateral by finding maximum curvature on the convex hull outline. radialgradient --- Creates a radial gradient image. radialgrid --- Superimposes circular grid lines on an image. randomblob --- Creates an image composed of a moderate sized black random blob shape on a white background. randomclipart --- Randomly distributes clip art over the image. rangethresh --- Converts an image to binary using range values for each channel of the input. recursion --- Creates a recursive affine composite effect in an image. redeye --- Removes redeye from an image. redist --- Modifies an image so that its (grayscale) histogram has a either Gaussian, distribution or a Uniform Distribution. reflect --- Splits an image, reflects each side and appends them to form horizontally symmetric images. remap --- Remaps the colors in an image using a 3D color distance metric relative to a color table map image. removecolorcast --- Removes a color cast from an image. replacecolor --- Changes one color to another color in an image. retinex --- Enhances detail and color in an image using the multiscale retinex algorithm. rgbdots --- Transforms an image into dots in primary and secondary colors. ripples --- Applies various circular ripple effects to an image. rmsecorr --- Computes the root mean squared correlation surface to find where a small image best matches within a larger image. rotate3D --- Applies a perspective distortion to an image by providing three rotation angles and an optional perspective exaggeration. sahoothresh --- Automatically thresholds an image to binary (b/w) format using Sahoo's entropy technique. saturation --- Changes the color saturation in an image. scalescroll --- Creates a scaled scrolling animation. scatter --- Generates a channel-by-channel scatter diagram between two images. scatterchannels --- Generates a scatter diagram between channels of an image. screeneffects --- Applies screen-like effects to an image. scriptbatch --- Runs another script over a folder of images. separate --- Identifies each separate white shape in a binary image. shadowhighlight --- Adjusts the tone in shadow and highlight areas of an image. shadows --- Applies drop shadows to an image that has an alpha channel. shapecluster --- Creates a division of the image into 5 separated rectangular regions. shapecompare --- Compares two images' shapes using metrics computed from Hu image moments. shapemorph --- Create a shape morphing animation sequence between two images. shapemorph2 --- Create a shape morphing animation sequence between two images. sharp --- Adaptively sharpens an image or extract edges. sharpedge --- Adaptively sharpens (or blurs) an image near edges. shimmer --- Creates a reflected heat shimmering effect animation. shuffle --- Randomly shuffles positions of square sized tiles in an image. sigmoidal --- Applies a sigmoidal brightness and/or contrast adjustment to an image. similar --- Computes the normalized cross correlation similarity metric between two equal dimensioned images. sinescrollimage --- Creates a sinusoidal curved scrolling image banner animation. sinescrolltext --- Creates a sinusoidal curved scrolling text banner animation. sketch --- Applies a sketch effect to an image. sketcher --- Applies a sketch effect to an image. sketchetch --- Creates an etch-like sketch from an image. sketching --- Applies a sketch effect to an image. skew --- Applies a skew distortion to an image. slantedlight --- Applies slanted lighting to an image. slice --- Thresholds an image (inclusively) between a range of graylevels and optionally colorizes inside and/or outside the threshold range. smartcrop --- Automatically crops an image to a given size around the hightest detail region. smarttrim --- Automatically trims an image around the region of highest detail in the image. softfocus --- Applies a softfocus effect to an image. softlight --- Applies soft light to an image. space --- Applies a spatially adaptive contrast (and brightness) enhancement filter to an image. space2 --- Applies a spatially adaptive contrast (and brightness) enhancement filter to an image. spectrum --- Computes the spectrum image from the magnitude of the Fourier Transform of an image. spectrumhist --- Creates either a color spectrum or histogram of the colors in an image. sphere --- Creates a colored sphere with a combination of diffuse and specular illumination. sphericalpano2cube --- Transforms a spherical panorama into a cubical representation. sphericalpano2rect --- Generate a perspective (rectilinear) image from a region of a spherical panorama image. spherize --- Warps an image onto a (hemi-)sphere. splice --- Applies a jagged cut and splice effect to an image. spline --- Draws a spline curve on an image based upon supplied points. splitcrop --- Crops an image into two or four sections according to the given x,y coordinates. splitimage --- Generates a side-by-side append of two partial images with an option to animate the amount of each image used in the append. splittone1 --- Applies a color splittone effect to an image. splittone2 --- Applies a color splittone effect to an image. splittone3 --- Applies a color splittone effect to an image. spots --- Converts the image into a series or uniform-colored spots. squareup --- Resizes an image and squares it up either by padding or cropping. ssim --- Computes the structural similarity metric between two equal sized images. stainedglass --- Applies a stained glass cell effect to an image. starburst --- Applies a starburst pattern to an image. statsfilt --- Computes various localized (neighborhood) statistical filters on an image. stdimage --- Computes a pixel-by-pixel standard deviation or variance image from multiple input images. stretch --- Modifies an image to automatically stretch the dynamic range between full black and white. striations --- Applies radial or circular striations to image. stripes --- Adds a striped border to an image. stutter --- Creates a 'stuttered' offset-like effect in an image. surroundblur --- Creates a blurred background region around the input image. textcleaner --- Processes a scanned document of text to clean the text background. textdeskew --- Unrotates (deskews) an image containing text. textdistort --- Distorts repeated text to warp it to the shape of the image content. texteffect --- Convert text to an image after applying various effects, styling and color. texteffect2 --- Converts large size text to an image with color, effects and styling. textetch --- Adds text to an image to simulate etching on glass. textglow --- Adds glowing text to an image or some background color. texturize --- Creates a texture pattern and optionally applies it to the background of an input image. thermography --- Simulates a picture taken with a thermal imaging camera. thresholds --- Applies one or two thresholds to an image. tileimage --- Tiles an image to a given size with various tile arrangements. tiler --- Converts an image into a tilable texture. tiltshift --- Applies a tiltshift effect to an image. tintilize --- Applies a color tint to the mid-range of a grayscale image. tinyplanet --- Transforms a spherical panorama to a linear fisheye view. tonemap1 --- Enhances the shadows and/or highlight regions in an image using a non-linear log or gamma function. tonemap2 --- Enhances the shadows and/or highlight regions in an image using a non-linear log or gamma function plus an extra processing function. tonemap3 --- Enhances the shadows and/or highlight regions in an image using a non-linear log or gamma function plus an extra processing function. tonemap4 --- Enhances the shadows and/or highlight regions in an image using a dual gamma function plus an extra processing function. toon --- Applies a cartoon effect to an image. toonify --- Applies a cartoon-like effect to an image. toonizarro --- Applies a Superman Bizarro-like cartoon effect to an image. toycamera --- Simulates pictures taken by lomographic or holga type toy cameras. transfercolor --- Transfers the coloring from one image to another image. transitions --- Applies an animated transition between two images. trianglethresh --- Automatically thresholds an image to binary (b/w) format using the triangle technique. tricolorize --- Smoothly colorizes a grayscale image with either one, two or three different colors. trim2detail --- Trims an image to the bounding rectangle about the image's main content. trim2rect --- Automatically trims the sides of an image until no outer row or column contains the background color. trimcorners --- Automatically crops the image to removed rounded corners. trimmer --- Trims the background from any number of specified sides of an image. tshirt --- Transforms an image to place it in a region of a tshirt image. tshirtwarp --- Transforms an image to place it in a region of a tshirt image using a lighting file, a displacement map and arguments provided by the script tshirt. tshirtwarper --- Transforms an image to place it in a region of a tshirt image using a lighting file, a displacement map and arguments provided by the script tshirt. tunnelize --- Creates a tunnel-like effect on an image. turbulence --- Applies a turbulence-like warping of the image. turn --- Simultaneously rotates and crops an image to eliminate any background. typewriter --- Creates a typewriter style text animation. unperspective --- Automatically removes pespective distortion from an image. unrotate --- Automatically unrotates a rotated image and trims the surrounding border. unrotate2 --- Automatically unrotates a rotated image and trims the surrounding border. unrotate3 --- Automatically unrotates a rotated image and trims the surrounding border. unsaturatehue --- Desaturates a given hue (range) in an image. unwatermark --- removes a larger (uniform colored) watermark from a small font text image. uwcorrect --- Corrects the color balance for red light attenuation in pictures taken underwater. variableblur --- Applies a variable blur to an image based upon a mask image. vibrance --- Applies a non-linear change to the saturation of an image. vibrance2 --- Applies a non-linear change to the chroma channel of an image. vibrance3 --- Applies a non-linear change to the chroma channel of an image. videoglitch --- Applies a video glitch effect to an image. vignette --- Applies a vignette effect to a picture. vignette2 --- Applies a vignette effect to a picture. vignette3 --- Applies a vignette effect to a picture. vintage1 --- Applies a classic blue-green vintage effect to an image. vintage2 --- Applies a colorful vintage effect to an image. vintage3 --- Applies an old, heritage style vintage effect to an image. vividize --- Enhances the colors in an image. warholeffect --- Creates an Andy Warhol style colorization image. warplog --- Resizes an image according to a logarithmic transformation. watercolor --- Applies a watercolor effect to an image. wavemap --- Transforms the graylevels in each RGB channel according to a sinusoidal wave function. weave --- Applies an irregular linear weave-like distortion to an image. whitebalance --- Transform an image's overall color balance according to a desired change in a specified white point color. whitebalancing --- Applies white balancing to an image according to a gray world method in LAB colorspace. whiteboard --- Processes a picture of a whiteboard to clean up the background and correct the perspective. wiggle --- Creates a sinusoidal wiggling animation. woodbrand --- Creates a branded effect in a wood grain image using a binary image as the brand. woodcut --- Applies a woodcut effect to an image. woodgrain --- Simulates a woodgrain texture. xpand --- Applies a non-uniform outward stretch of the image in one direction. xposure --- Changes the exposure level of an image by photographic stops. xtract --- Uses Hough lines to extract and rectify a quadrilateral area from an image. zerocrossing --- Applies a zero crossing edge detector to an image. zoomblur --- Applies a radial or zoom blur to an image. zoomrotatetext --- Creates a zoomed rotating text animation.