Update cheatsheets

compare

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# compare
+
+> Create a comparison image to visually annotate the difference between two images.
+> Part of ImageMagick.
+> More information: <https://imagemagick.org/script/compare.php>.
+
+- Compare two images:
+
+`compare {{path/to/image1.png}} {{path/to/image2.png}} {{path/to/diff.png}}`
+
+- Compare two images using the specified metric:
+
+`compare -verbose -metric {{PSNR}} {{path/to/image1.png}} {{path/to/image2.png}} {{path/to/diff.png}}`