Legacy ImageMagick Discussions Archive

In case anyone else finds their way to this thread, look at jpegtran which recompresses jpg files and also packjpg which creates jpeg archive files which are around 30% better than the original file. The original file can be extracted as JPG byte for byte.

Answering myself; ...except that JPEGs aren't compressed as such, like you said previously, there's just a knob for quality. Without the raw pre-jpegged files to hand, there's probably little that can be done to reduce storage even across files without losing quality. They're probably already as ...

Doh. Thanks - you're absolutely right of course, I should have remembered that about JPEGs. A PNG approach would be worth testing, but presumably a conversion between JPG and PNG wouldn't be an isomorphic lossless conversion. I wonder if saving JPEG files *without* compression first and then ...

Well I've been reading the other similar posts and I've tried following those but the results I get are surprising. For instance, I understand (now) that by default, tiling two JPEGS would harmonize the color table in any case, but the resulting file is around 10% bigger than the sum of it's parts ...

I'm trying to combine two jpegs into a single image strip (think sprites) with a single shared palette in the hope of saving space under compression. I then want to be able to extract those two images into new files losslessly. Can anyone help me with the windows syntax for this? Essentially; 1 ...