-strip

[GreenKoopa]

Running

Code: Select all

convert in.jpg -strip out.png
identify -verbose out.png

reveals Properties:exif:* and Properties:jpeg:* still in the png file. This began between versions 6.8.4-8 and 6.8.5-6.

I first noticed this new behavior when running

Code: Select all

convert in.jpg -strip ... out.png
convert out.png -quality 95 out.jpg

My jpeg sampling-factor used to be set by -quality. Now it is being carried over from in.jpg (through a -strip, through a png file, and through a -quality setting).

[glennrp]

The JPEG sampling factors and colorspace properties are preserved in PNG text chunks. It is a side effect of
preserving them when converting a jpeg to another jpeg. We should probably exclude the jpeg properties when
writing a PNG.

This is fixed in the SVN repository revision 12739, and the fix will appear in IM-6.8.6-7

[GreenKoopa]

Thank you Glenn.