Use the composite program overlaps one image over another. See Command Line Processing for advice on how to structure your composite command or see below for example usages of the command.

Example Usage

We list a few examples of the composite command here to illustrate its usefulness and ease of use. To get started, lets overlay a letter over a a rose:

composite -gravity center smile.gif  rose: rose-over.png

smile over rose ==> rose

You can create three-dimensional effect with the Atop:

  convert -size 70x70 xc:none -fill red -draw 'circle 35,35 10,30' red-circle.png
  convert -size 70x70 xc:none -draw 'circle 35,35 35,20' -negate -channel A -gaussian 0x8 white-highlight.png
  composite -compose atop -geometry -13-17 white-highlight.png red-circle.png red-ball.png

white highlight atop red circle ==> red ball

You can find additional examples of using composite in Examples of ImageMagick Usage. You can find out more about them and the mathematics by looking at SVG Alpha Compositing

Option Summary

The composite command recognizes these options. Click on an option to get more details about how that option works.

Option Description
-affine matrix affine transform matrix
-authenticate value decrypt image with this password
-blend geometry blend images
-blue-primary point chromaticity blue primary point
-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 image compression type
-debug events display copious debugging information
-define format:option define one or more image format options
-density geometry horizontal and vertical density of the image
-depth value image depth
-displace geometry shift image pixels defined by a displacement map
-dissolve value dissolve the two images a given percent
-dither apply Floyd/Steinberg error diffusion to image
-encoding type text encoding type
-endian type endianness (MSB or LSB) of the image
-extract geometry extract area from image
-filter type use this filter when resizing an image
-font name render text with this font
-geometry geometry perferred size or location of the image
-gravity type horizontal and vertical text placement
-green-primary point chromaticity green primary point
-help print program options
-interlace type type of image interlacing scheme
-label name assign a label to an image
-level value adjust the level of image contrast
-limit type value pixel cache resource limit
-log format format of debugging information
-matte store matte channel if the image has one
-monitor monitor progress
-monochrome transform image to black and white
-negate replace every pixel with its complementary color
-page geometry size and location of an image canvas (setting)
-profile filename add, delete, or apply an image profile
-quality value JPEG/MIFF/PNG compression level
-quiet suppress all error or warning messages
-red-primary point chromaticity red primary point
-rotate degrees apply Paeth rotation to the image
-sampling-factor geometry horizontal and vertical sampling factor
-scene value image scene number
-set attribute value set an image attribute
-sharpen geometry sharpen the image
-size geometry width and height of image
-stegano offset hide watermark within an image
-strip strip image of all profiles and comments
-support factor resize support: > 1.0 is blurry, < 1.0 is sharp
-thumbnail geometry create a thumbnail of the image
-tile repeat composite operation across and down image
-transform affine transform image
-treedepth value color tree depth
-type type image type
-units type the units of image resolution
-unsharp geometry sharpen the image
-verbose print detailed information about the image
-version print version information
-virtual-pixel method access method for pixels outside the boundaries of the image
-watermark geometry percent brightness and saturation of a watermark
-white-point point chromaticity white point
-white-threshold value forces all pixels above the threshold into white
-write filename write images to this file
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