Friday, March 11, 2011

Various options available in ImageMagick

I explained how to resize the image using convert command from command line. This is only one of the options in ImageMagick. There are lots more. Here is the complete list of options available in ImageMagick that we can use from command line:

convert [options ...] file [ [options ...] file ...] [options ...] file

Image Settings:
  -adjoin                                    join images into a single multi-image file
  -affine matrix                           affine transform matrix
  -alpha option                           activate, deactivate, reset, or set the alpha channel
  -antialias                                  remove pixel-aliasing
  -authenticate password            decipher image with this password
  -attenuate value                        lessen (or intensify) when adding noise to an image
  -background color                   background color
  -bias value                               add bias when convolving an image
  -black-point-compensation      use black point compensation
  -blue-primary point                  chromaticity blue primary point
  -bordercolor color                   border color
  -caption string                          assign a caption to an image
  -channel type                          apply option to select image channels
  -colors value                           preferred number of colors in the image
  -colorspace type                     alternate image colorspace
  -comment string                      annotate image with comment
  -compose operator                 set image composite operator
  -compress type                       type of pixel compression when writing the image
  -define format:option               define one or more image format options
  -delay value                            display the next image after pausing
  -density geometry                   horizontal and vertical density of the image
  -depth value                           image depth
  -direction type                        render text right-to-left or left-to-right
  -display server                       get image or font from this X server
  -dispose method                    layer disposal method
  -dither method                       apply error diffusion to image
  -encoding type                       text encoding type
  -endian type                          endianness (MSB or LSB) of the image
  -family name                         render text with this font family
  -fill color                              color to use when filling a graphic primitive
  -filter type                            use this filter when resizing an image
  -font name                           render text with this font
  -format "string"                    output formatted image characteristics
  -fuzz distance                      colors within this distance are considered equal
  -gravity type                        horizontal and vertical text placement
  -green-primary point           chromaticity green primary point
  -intent type                          type of rendering intent when managing the image color
  -interlace type                     type of image interlacing scheme
  -interline-spacing value        set the space between two text lines
  -interpolate method             pixel color interpolation method
  -interword-spacing value     set the space between two words
  -kerning value                    set the space between two letters
  -label string                        assign a label to an image
  -limit type value                  pixel cache resource limit
  -loop iterations                   add Netscape loop extension to your GIF animation
  -mask filename                   associate a mask with the image
  -mattecolor color                frame color
  -monitor                             monitor progress
  -orient type                        image orientation
  -page geometry                 size and location of an image canvas (setting)
  -ping                                 efficiently determine image attributes
  -pointsize value                 font point size
  -precision value                maximum number of significant digits to print
  -preview type                   image preview type
  -quality value                    JPEG/MIFF/PNG compression level
  -quiet                               suppress all warning messages
  -red-primary point            chromaticity red primary point
  -regard-warnings              pay attention to warning messages
  -remap filename               transform image colors to match this set of colors
  -respect-parentheses        settings remain in effect until parenthesis boundary
  -sampling-factor geometry                   horizontal and vertical sampling factor
  -scene value                     image scene number
  -seed value                      seed a new sequence of pseudo-random numbers
  -size geometry                  width and height of image
  -stretch type                    render text with this font stretch
  -stroke color                   graphic primitive stroke color
  -strokewidth value           graphic primitive stroke width
  -style type                       render text with this font style
  -taint                               image as ineligible for bi-modal delegate
  -texture filename              name of texture to tile onto the image background
  -tile-offset geometry         tile offset
  -treedepth value               color tree depth
  -transparent-color color    transparent color
  -undercolor color            annotation bounding box color
  -units type                       the units of image resolution
  -verbose                         print detailed information about the image
  -view                              FlashPix viewing transforms
  -virtual-pixel method       virtual pixel access method
  -weight type                   render text with this font weight
  -white-point point           chromaticity white point

Image Operators:
  -adaptive-blur geometry                   adaptively blur pixels; decrease effect near edges
  -adaptive-resize geometry                adaptively resize image using 'mesh' interpolation
  -adaptive-sharpen geometry            adaptively sharpen pixels; increase effect near edges
  -alpha option                                      on, activate, off, deactivate, set, opaque, copy
                                                                transparent, extract, background, or shape
  -annotate geometry text                    annotate the image with text
  -auto-gamma                                       automagically adjust gamma level of image
  -auto-level                                           automagically adjust color levels of image
  -auto-orient                                         automagically orient (rotate) image
  -bench iterations                                measure performance
  -black-threshold value                      force all pixels below the threshold into black
  -blue-shift factor                                simulate a scene at nighttime in the moonlight
  -blur geometry                                    reduce image noise and reduce detail levels
  -border geometry                               surround image with a border of color
  -bordercolor color                              border color
  -brightness-contrast geometry        improve brightness / contrast of the image
  -cdl filename                                        color correct with a color decision list
  -charcoal radius                                  simulate a charcoal drawing
  -chop geometry                                  remove pixels from the image interior
  -clamp                                                  restrict pixel range from 0 to the quantum depth
  -clip                                                      clip along the first path from the 8BIM profile
  -clip-mask filename                             associate a clip mask with the image
  -clip-path id                                         clip along a named path from the 8BIM profile
  -colorize value                                     colorize the image with the fill color
  -color-matrix matrix                             apply color correction to the image
  -contrast                                              enhance or reduce the image contrast
  -contrast-stretch geometry               improve contrast by `stretching' the intensity range
  -convolve coefficients                       apply a convolution kernel to the image
  -cycle amount                                      cycle the image colormap
  -decipher filename                              convert cipher pixels to plain pixels
  -deskew threshold                              straighten an image
  -despeckle                                            reduce the speckles within an image
  -distort method args                           distort images according to given method ad args
  -draw string                                          annotate the image with a graphic primitive
  -edge radius                                         apply a filter to detect edges in the image
  -encipher filename                               convert plain pixels to cipher pixels
  -emboss radius                                    emboss an image
  -enhance                                               apply a digital filter to enhance a noisy image
  -equalize                                               perform histogram equalization to an image
  -evaluate operator value                    evaluate an arithmetic, relational, or logical expression
  -extent geometry                                 set the image size
  -extract geometry                                extract area from image
  -fft                                                          implements the discrete Fourier transform (DFT)
  -flip                                                        flip image vertically
  -floodfill geometry color                    floodfill the image with color
  -flop                                                      flop image horizontally
  -frame geometry                                  surround image with an ornamental border
  -function name parameters                apply function over image values
  -gamma value                                       level of gamma correction
  -gaussian-blur geometry                    reduce image noise and reduce detail levels
  -geometry geometry                           preferred size or location of the image
  -identify                                                identify the format and characteristics of the image
  -ift                                                          implements the inverse discrete Fourier transform (DFT)
  -implode amount                                 implode image pixels about the center
  -lat geometry                                       local adaptive thresholding
  -layers method                                    optimize, merge,  or compare image layers
  -level value                                          adjust the level of image contrast
  -level-colors color,color                    level image with the given colors
  -linear-stretch geometry                    improve contrast by `stretching with saturation'
  -liquid-rescale geometry                    rescale image with seam-carving
  -median radius                                    apply a median filter to the image
  -modulate value                                  vary the brightness, saturation, and hue
  -monochrome                                      transform image to black and white
  -morphology method kernel             apply a morphology method to the image
  -motion-blur geometry                      simulate motion blur
  -negate                                                replace every pixel with its complementary color
  -noise radius                                      add or reduce noise in an image
  -normalize                                           transform image to span the full range of colors
  -opaque color                                    change this color to the fill color
  -ordered-dither NxN                         add a noise pattern to the image with specific amplitudes
  -paint radius                                      simulate an oil painting
  -polaroid angle                                  simulate a Polaroid picture
  -posterize levels                                reduce the image to a limited number of color levels
  -profile filename                                add, delete, or apply an image profile
  -quantize colorspace                        reduce colors in this colorspace
  -radial-blur angle                              radial blur the image
  -raise value                                        lighten/darken image edges to create a 3-D effect
  -random-threshold low,high           random threshold the image
  -region geometry                              apply options to a portion of the image
  -render                                                render vector graphics
  -repage geometry                             size and location of an image canvas
  -resample geometry                         change the resolution of an image
  -resize geometry                               resize the image
  -roll geometry                                   roll an image vertically or horizontally
  -rotate degrees                                 apply Paeth rotation to the image
  -sample geometry                            scale image with pixel sampling
  -scale geometry                               scale the image
  -segment values                              segment an image
  -selective-blur geometry                selectively blur pixels within a contrast threshold
  -sepia-tone threshold                     simulate a sepia-toned photo
  -set property value                         set an image property
  -shade degrees                                shade the image using a distant light source
  -shadow geometry                          simulate an image shadow
  -sharpen geometry                          sharpen the image
  -shave geometry                              shave pixels from the image edges
  -shear geometry                               slide one edge of the image along the X or Y axis
  -sigmoidal-contrast geometry        increase the contrast without saturating highlights or shadows
  -sketch geometry                             simulate a pencil sketch
  -solarize threshold                           negate all pixels above the threshold level
  -sparse-color method args              fill in a image based on a few color points
  -splice geometry                              splice the background color into the image
  -spread radius                                  displace image pixels by a random amount
  -strip                                                  strip image of all profiles and comments
  -swirl degrees                                   swirl image pixels about the center
  -threshold value                               threshold the image
  -thumbnail geometry                       create a thumbnail of the image
  -tile filename                                     tile image when filling a graphic primitive
  -tint value                                         tint the image with the fill color
  -transform                                         affine transform image
  -transparent color                            make this color transparent within the image
  -transpose                                         flip image vertically and rotate 90 degrees
  -transverse                                        flop image horizontally and rotate 270 degrees
  -trim                                                    trim image edges
  -type type                                          image type
  -unique-colors                                  discard all but one of any pixel color
  -unsharp geometry                          sharpen the image
  -vignette geometry                          soften the edges of the image in vignette style
  -wave geometry                                alter an image along a sine wave
  -white-threshold value                    force all pixels above the threshold into white

Image Sequence Operators:
  -append                                      append an image sequence top to bottom
  -clut                                             apply a color lookup table to the image
  -coalesce                                     merge a sequence of images
  -combine                                     combine a sequence of images
  -composite                                  composite image
  -crop geometry                           cut out a rectangular region of the image
  -deconstruct                               break down an image sequence into constituent parts
  -evaluate-sequence operator        evaluate an arithmetic, relational, or logical expression
  -flatten                                        flatten a sequence of images
  -fx expression                            apply mathematical expression to an image channel(s)
  -hald-clut                                   apply a Hald color lookup table to the image
  -morph value                             morph an image sequence
  -mosaic                                       create a mosaic from an image sequence
  -print string                                interpret string and print to console
  -process arguments                  process the image with a custom image filter
  -reverse                                       reverse image sequence
  -separate                                     separate an image channel into a grayscale image
  -write filename                            write images to this file

Image Stack Operators:
  -clone index                                  clone an image
  -delete index                                 delete the image from the image sequence
  -insert index                                  insert last image into the image sequence
  -swap indexes                              swap two images in the image sequence

Miscellaneous Options:
  -debug events                              display copious debugging information
  -help                                              print program options
  -list type                                       print a list of supported option arguments
  -log format                                   format of debugging information
  -version                                        print version information


By default, the image format of `file' is determined by its magic number.  To specify a particular image format, precede the filename with an image format name and a colon (i.e. ps:image) or specify the image type as the filename suffix (i.e. image.ps).  Specify 'file' as '-' for standard input or output.

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