>> The difference in size is only very slight, about 1%, and it is not due >> to excessive data being stripped off. The image content is actually >> slightly different. I compared the two images via >> >> convert original.jpg extracted.jpg -compose difference -composite >> comparison.png >> >> and then counted the colours. > > A difference in color count does indicate a difference in image content > (although the same color count would not prove identical image > content).
You misunderstood me: I counted the colours in comparison.png, which is 1 if the two images are identical. (This is the result I get when I combine the JPEGs with Acrobat and then extract them with pdfimages.) > Not only is there no benefit to the re-encoding, there are actually two > problems that result: it takes more processor power, and every > re-encoding loses a bit of quality. Well, that's why I'm asking all this ;-) Greetings from Münster, germany Wolfgang Hugemann _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
