![]() ![]() Settings remain in effect until parenthesis boundary. Measure differences between images with this metric Identify the format and characteristics of the imageĭe-emphasize pixel differences with this color Maximum RMSE for (sub)image match (default 0.2)Ĭolors within this distance are considered equalĮmphasize pixel differences with this color Horizontal and vertical density of the image Transparent, extract, background, or shape the alpha channel ![]() ![]() On, activate, off, deactivate, set, opaque, copy", Click on an option to get more details about how that option works. The compare command recognizes these options. Find the full path to where IM (convert) resides by typing in a shell. Further discussion is available in More Graphics from the Command Line and Examples of ImageMagick Usage. These scripts are bash unix shell scripts and should work on Linux and Mac OSX. You can find additional examples of using compare in Graphics from the Command Line. $magick> compare -metric RMSE -subimage-search logo.png wizard.jpg similarity.gif 85.05 (0.00129778) 353,157 In addition, it returns a similarity image such that an exact match location is completely white and if none of the pixels match, black, otherwise some gray level in-between: If the reconstructed image is a subimage of the image, the compare program returns the best match offset. In order to make sure there are no bright spots that may distract the viewer, Id like to find all the images whose brightest pixels exceed a certain. $magick> compare -metric PSNR rose.jpg reconstruct.jpg difference.png 28.31 Or, if you just want the overall image distortion, use this command: $magick> compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png 19.63 Or, if you just want the red channel distortion, use this command: $magick> compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png Image: rose.jpg In addition to the visual interpretation of the difference in an image and its reconstruction, we report a mathematical measure of the difference: The red areas of the difference image emphasizes (highlight) pixels that are affected by the image sharpening, whereas white de-emphasizes (lowlight) pixels that are untouched by the sharpening process. ![]()
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