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."

Re:AI problem?

[lunchlady55]

Oh sure, it starts out innocently enough - pick the better image. Next thing you know Skynet's decided that it's the better LIFE-FORM.

AI - JUST SAY NO!

Brought to you by the Coalition for Human Survival (C) Aug. 29, 1997

Re:AI problem?

[eikonoklastes]

Well, of course, how else would you do it? It's so simple.

Filters

[mypalmike]

First, make a bumpmap of each image. Then, render them onto quads with a light at a 45 degree angle to the surface normal. Run a gaussian blur on each resulting image. Then run a quantize filter, followed by lens flare, solarize, and edge-detect. At this point, the answer will be clear: both images look horrible.

Re:File size

[Anonymous Coward]

>>Except for Lossless JPEG [wikipedia.org] standardized in 1993. But other than that, no there is no lossless jpeg.

Katie Couric: What did John McCain do to try to stop the housing meltdown?
Sarah Palin: He voted for legislation to more carefully regulate Fannie Mae and Freddie Mac to stop bad lending practices.
Katie Couric: ...
Katie Couric: Well, besides that, what did he do?
Sarah Palin: ?

And the funny thing is, we all remember this now as Sarah Palin not knowing the answer to the question, when it was really Katie Couric who was the fucktard that didn't know about lossless jpeg.

True story.

Re:File size

[Minwee]

And a squad of kanagaroos firing RPGs.