Slashdot Mirror
Choosing Better-Quality JPEG Images With Software?
kpoole55 writes "I've been googling for an answer to a question and I'm not making much progress. The problem is image collections, and finding the better of near-duplicate images. There are many programs, free and costly, CLI or GUI oriented, for finding visually similar images — but I'm looking for a next step in the process. It's known that saving the same source image in JPEG format at different quality levels produces different images, the one at the lower quality having more JPEG artifacts. I've been trying to find a method to compare two visually similar JPEG images and select the one with the fewest JPEG artifacts (or the one with the most JPEG artifacts, either will serve.) I also suspect that this is going to be one of those 'Well, of course, how else would you do it? It's so simple.' moments."
I mean, you don't want second rate pictures in your pr0n stash?
I had problems building it back then, let alone writing the scripts for it and the hassle of figuring out which images were duplicates, but this utility seems to fit the bill.
Except for Lossless JPEG standardized in 1993. But other than that, no there is no lossless jpeg.
AI or small utility... You never know with computers ;)
Analogies don't equal equalities, they are merely somewhat analogous.
Since the mods haven't noticed, and I don't have mod points, let me point out that THIS POST HAS THE ANSWER. A real program that will do what the asker wants. The source is available, but I can't seem to find its license (it includes some of the Independent JPEG Goup's code). Also, doesn't a jpeg's EXIF data or some other tag in the file tell you what quality it was saved at?
The government can't save you.