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File:Wikisource GIMP image extraction guide - JPG compression noise.png

Wikisource_GIMP_image_extraction_guide_-_JPG_compression_noise.png ‎(466 × 290 pixels, file size: 73 KB, MIME type: image/png)

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Description
English: After JPG save (Q=92) - compression differences
 convert img.png img.jpg
 convert img.jpg img.png -colorspace RGB -compose minus -composite -negate -threshold 99.9% -fill red -opaque black -transparent white diff.png
 convert img.png -colorspace RGB diff.png -composite out.png
Date (original image circa. 1813-1820)
Source https://digital.nls.uk/chapbooks-printed-in-scotland/archive/104186712
Author Unknown engraver
Other versions Category:Wikisource GIMP image extraction guide

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Wikisource_GIMP_image_extraction_guide_-_JPG_compression_noise.png

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current03:50, 13 May 2021Thumbnail for version as of 03:50, 13 May 2021466 × 290 (73 KB)Inductiveload (talk | contribs)== {{int:filedesc}} == {{Information |Description={{en|After JPG save (Q=92) - compression differences Generated with convert img.png img.jpg convert img.jpg img.png -colorspace RGB -compose minus -composite -negate -threshold 99.9% -fill red -opaque black -transparent white diff.png convert img.png -colorspace RGB diff.png -composite out.png }} |Source=https://digital.nls.uk/chapbooks-printed-in-scotland/archive/104186712 |Date=2021 (original image circa. 1813-1820) |Author={{unknown en...

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