This Enfocus PitStop command allows us to select images depending on the compression method applied to them. There are nine options: "ASCII Hex, CCITT, ZIP, RunLength, JPEG2000, ASCII85, JPEG, LZW" and "JBIG2". It does not contain the option "None".
If we check the box "Also look at soft-mask images", any image mask of this type will be selected (Bitmap softmask are pixel images used as masks, from level 1.4 of the PDF format) as long as it has one of the chosen compression methods.
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