Open bitsgalore opened 2 days ago
Exiftool can report a JPEGv quality estimate, see here. This works with custom-generated images I create in ImageMagick. For example:
convert -quality 60 wizard: wizard-60.jpg
Throw this at ExifTool:
exiftool -X -JPEGQualityEstimate wizard-60.jpg
Result:
<File:JPEGQualityEstimate>60</File:JPEGQualityEstimate>
This also works at lower quality levels (e.g. 40). But for every JPEG that I extract from our test PDFs I get this instead:
<File:JPEGQualityEstimate><unknown></File:JPEGQualityEstimate>
This matches exactly with the situations where ImageMagick's quality estimates fail. as documented here:
https://github.com/ImageMagick/ImageMagick6/issues/260
Exiftool can report a JPEGv quality estimate, see here. This works with custom-generated images I create in ImageMagick. For example:
Throw this at ExifTool:
Result:
This also works at lower quality levels (e.g. 40). But for every JPEG that I extract from our test PDFs I get this instead:
This matches exactly with the situations where ImageMagick's quality estimates fail. as documented here:
https://github.com/ImageMagick/ImageMagick6/issues/260