-adaptive-resize geometry, adaptively resize image with data dependent triangulation. -adaptive-sharpen geometry, adaptively sharpen pixels; increase effect. Due to recommendations for using adaptive-sharpen ( discourse-server =1&t=) I decided to give it a try. -adaptive-blur -adaptive-sharpen -black-threshold -clut (when mapping greyscale CLUT image to alpha channel if set by -channels) -colors for gray colorspace.

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This option produces a solarization effect seen when exposing a photographic film to light during the development process. It is equivalent to using the -gravity command-line option, except that it is limited in scope to the -draw option in which it appears. A number of algorithms search for a target color. If the cropped image ‘missed’ the actual image on its virtual canvas, a special single pixel transparent ‘missed’ image is returned, and a ‘crop missed’ warning given.

The newer -morphology convolution equivalents however does have a understanding of the ‘Sync’ flag and will thus handle transparency correctly by default. If two control points are specified, the line between each end knot and its sequentially respective control point determines the tangent direction of the curve at that end. Empty triangles left over from shearing the image are filled with the color defined by the -background option. Thus contributions from pixels outside that range can be ignored.

See Format and Print Image Properties for details of the percent escape codes. The option to invoke an unsharp mask looks like this.

Bluring and Sharpening — IM v6 Examples

The default for phase is 0. Other well known ‘properties’ that are available include: To print a complete list of the thresholds that have been defined, use the -list threshold option. However it then stretches those colors using the -level operator.


The events parameter specifies which events are to be logged. You can add the to the geometry argument to equally divide the image into the number of tiles generated.

Specify the count and the image to duplicate by its index in the sequence. I am installing Windows binaries. To ensure that it can do this it also ensures that the image has an alpha channel enabled, as per ” -alpha set “, for the new transparent colors, and sbarpen not require you to modify the -channel to enable alpha channel handling. This produces a list of values such as If this setting is shxrpen, then the search will stop as soon as it finds a match whose metric is less than or equal to the value.

But by bluring the image transparency a little, I can make the overlay fit onto the background more smoothly. The default shqrpen the compression type of the specified image file. The following formulas are currently provided, and will first convert the pixel values to linear-RGB or non-linear sRGB colorspace before being applied to calculate the final greyscale value.

The saturation controls the amount of color in an image. A pixel is defined as noise if and only if this pixel is a maximum or minimum within the pixel window. This concurs with the remarks in the main article.

Perhaps one of your delegates needs updating if installing from source. See Resources for more details of configuration files. If you do not select a filter with this option, the filter defaults to Mitchell for a colormapped image, an image with a matte channel, or if the image is enlarged.


If you want the label to be visible on the image itself, use the -draw option, or during the final processing in the creation of an image montage.

Please note that the default sigma if you do not specify anything is 1. To modify a comment of images already in memory use ” -set comment “. To invert its meaning -negate the image before and after. This is can be considered a multi-argument imagemagjck of the -evaluate operator. If a memory request is not honored, the pixels are allocated to disk and lmagemagick file is memory-mapped. It agrees mostly with what I understand about the algorithm.

It may be used to adjust the rendered size for desktop publishing purposes by adjusting the scale applied to the pixels. Choose the argument type from the list below.


If private is chosen, the image colors appear exactly as they are defined. Used to set a flag on an image indicating whether or not to use existing alpha channel data, to create an alpha channel, or to perform other operations on the alpha channel.

The color of the border is specified with the -mattecolor command line imgemagick. This is very similar to -contrast-stretchand uses a ‘histogram bin’ to determine the range of color values that needs to be stretched.

Large dots can be made to look better with a small amount of blurring after being created.