GraphicsMagick GM Utility

gm convert

NAME

convert - convert an image or sequence of images

Contents

Synopsis
Description
Examples
Options
Image Segmentation
Environment
Configuration Files
Authors
Copyright

Synopsis

convert [ options ... ] input_file output_file

Description

Convert converts an input file using one image format to an output file with a differing image format. In addition, various types of image processing can be performed on the converted image during the conversion process. Convert recognizes the image formats listed in GraphicsMagick(1).

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Examples

To make a thumbnail of a JPEG image, use:

    gm convert -size 120x120 cockatoo.jpg -resize 120x120 +profile "*" thumbnail.jpg

In this example, '-size 120x120' gives a hint to the JPEG decoder that the image is going to be downscaled to 120x120, allowing it to run faster by avoiding returning full-resolution images to GraphicsMagick for the subsequent resizing operation. The '-resize 120x120' specifies the desired dimensions of the output image. It will be scaled so its largest dimension is 120 pixels. The '+profile "*"' removes any ICM, EXIF, IPTC, or other profiles that might be present in the input and aren't needed in the thumbnail.

To convert a MIFF image of a cockatoo to a SUN raster image, use:

    gm convert cockatoo.miff sun:cockatoo.ras

To convert a multi-page PostScript document to individual FAX pages, use:

    gm convert -monochrome document.ps fax:page

To convert a TIFF image to a PostScript A4 page with the image in the lower left-hand corner, use:

    gm convert -page A4+0+0 image.tiff document.ps

To convert a raw Gray image with a 128 byte header to a portable graymap, use:

    gm convert -depth 8 -size 768x512+128 gray:raw image.pgm

In this example, "raw" is the input file. Its format is "gray" and it has the dimensions and number of header bytes specified by the -size option and the sample depth specified by the -depth option. The output file is "image.pgm". The suffix ".pgm" specifies its format.

To convert a Photo CD image to a TIFF image, use:

    gm convert -size 1536x1024 img0009.pcd image.tiff
    gm convert img0009.pcd[4] image.tiff

To create a visual image directory of all your JPEG images, use:

    gm convert 'vid:*.jpg' directory.miff

To annotate an image with blue text using font 12x24 at position (100,100), use:

    gm convert -font helvetica -fill blue -draw "text 100,100 Cockatoo"
            bird.jpg bird.miff

To tile a 640x480 image with a JPEG texture with bumps use:

    gm convert -size 640x480 tile:bumps.jpg tiled.png

To surround an icon with an ornamental border to use with Mosaic(1), use:

    gm convert -mattecolor "#697B8F" -frame 6x6 bird.jpg icon.png

To create a MNG animation from a DNA molecule sequence, use:

    gm convert -delay 20 dna.* dna.mng

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Options

Options are processed in command line order. Any option you specify on the command line remains in effect for the set of images that follows, until the set is terminated by the appearance of any option or -noop. S=">" BORDER=0 height=14 width=15> Options

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