Overrides the default recompression quality setting (used by PitStop when changing images) with the one defined in this Action.
If PitStop is used to change images (e.g. to convert the color, to resample the image...), the images are decompressed first, then changed, and afterwards recompressed according to the default settings (maximum for JPEG, lossless for JPEG2000). With these default settings, files may grow to an unacceptable size compared to the original input PDF file. In that case, you can use Override default image recompression to make the files smaller.