Related to my question question about negating only non-saturated colors, I would like to know how to convert a specific [s]channel[/s] color. The -negate option replaces each pixel with its complementary color. The – channel RGB option is necessary as of ImageMagick 7 to prevent. Can ImageMagick negate only non-saturated colors (black, white, and gray)? I tried negating the whole image before rotating the hue, but that.

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The color of the border is specified with the -mattecolor command line option. To print a complete list of -evaluate operators, use -list evaluate. Unlike the similar -frame option, -raise does not alter the dimensions of the image. The x and y offsets are treated in the same manner as in -crop. Choose from these intents: The same ‘artifact’ settings can also be defined using the -set “option: Blend will average the images together ‘plus’ according to the percentages given and each pixels transparency.

While it can remove internal rows and columns of pixels, it is more typically used with as -gravity setting and zero offsets so as to remove a single edge from an image. This can make some image file formats, such as PNG, smaller as the RGB values of transparent pixels are more uniform, and thus can compress better.

This is a convert version of ” compare ” for two same sized images. The -frame option is affected by the current -compose setting and assumes that this is using the default ‘ Over ‘ composition method.


When given as an integer, the minimum attainable value is 0 corresponding to black when all channels are affectedbut the maximum value corresponding to white is that of the quantum depth of the particular build of ImageMagick, and imagemagidk therefore dependent on the installation. The comment can contain special format characters listed in the Format and Print Image Properties.


It transforms an image from the normal spatial domain to the frequency domain. This conforms to the usual mathematical convention once it is realized that the positive y —direction is conventionally inagemagick to be downward for images.

However if the viewed image is minified image becomes smallera special area resampling function added ImageMagick v6. Good settings for this are the ‘ bilinear ‘ and ‘ bicubic ‘ interpolation settings, which give smooth imagemagiick gradients, and the ‘ integer ‘ setting for a direct, unsmoothed lookup of color values.

Any chunk names that are not known to ImageMagick are ignored if they appear in either the “include-chunk” or “exclude-chunk” list. Note that -contrast-stretch 0 will modify the image such that the image’s min and max values are stretched to 0 and QuantumRangerespectively, without any loss of data due to burn-out or clipping at either end.

The first and last points are the knots and these points are attained by the curve, while any intermediate coordinates are control points. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of ikagemagickprivacy policy and cookie policyand that your continued imabemagick of the website is subject to these policies.

See xstdcmap 1 for one way of creating Standard Colormaps. Caution is always advised. This option is new as of ImageMagick 6. For example, a gravity of Center forces the text to be centered within the image. This reduces the number of colors needed to reproduce the image but at the cost of a lower level pattern of colors.


ImageMagick: Command-line Options

If larger than a single row or column, values are taken from a diagonal line from top-left to bottom-right corners. To specify the amount to be removed, use -shave instead. These operators have yet to be made to understand the newer ‘Sync’ flag.

Separate colorization values can be applied to the red, green, and blue channels of the image with a comma-delimited list of colorization values e.

This EXIF profile setting is usually set using a gravity sensor in digital camera, however photos taken directly downward or upward may not have an appropriate value. Definitions are generally used negatr control image file format coder modules, and negat processing operations, beyond what is provided by normal means.

Internally ImageMagick does a -roll of the tile image by the arguments given when the tile image is set. When used as an option to composite-gravity gives the direction that the image gravitates within the composite.

Typically resulting in ‘halo’ effects. This process is iterated until it converges and the final mean is then used to replace the original pixel value.