Update cheatsheets

tldr/magick-identify

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# magick identify
+
+> Describe the format and characteristics of image files.
+> See also: `magick`.
+> More information: <https://imagemagick.org/script/identify.php>.
+
+- Describe the format and basic characteristics of an image:
+
+`magick identify {{path/to/image}}`
+
+- Describe the format and verbose characteristics of an image:
+
+`magick identify -verbose {{path/to/image}}`
+
+- Collect dimensions of all JPEG files in the current directory and save them into a CSV file:
+
+`magick identify -format "{{%f,%w,%h
+}}" {{*.jpg}} > {{path/to/filelist.csv}}`