Legacy ImageMagick Discussions Archive

I am not sure IM can do a 3 image compare. So I am not sure what which images are being compared. Also it should be null: not NUL Oops, I see I made a typo there; that should've been: compare -metric PSNR balloon.jpg balloon_im_from_tiff.jp2 NUL Result is still 1.#INF though. (BTW NUL seems to be c...

Great, I can confirm that setting -quality to 0 fixes the issue. Changing the default behaviour makes a lot of sense, good to see this will be changed in the next version. Many thanks all for the fast responses!

If you look at the JPEG to JP2 via TIFF example in my original link, you see that it is actually possible to get a perfect match (also if I do the comparison between the source JPEG and the result TIFF both are identical). So it is definitely possible, but the JPEG decode behaviour appears to depend...

After compressing a JPEG image to lossless (!) JP2, the pixel values of the resulting JP2 are not identical to those of the source JPEG. Full description, tests and sample images here: https://github.com/bitsgalore/jpegToLosslessJP2 The issue doesn't occur for other input formats (and neither for di...

OK, forgot about my suggestion below, I managed to hack into the ICC profile (oldskool hex-editing skills!) and manually changed the zero value, and it still gives me the same problem. So it must be something else! I can also add that I was able to reproduce this problem with the Windows binaries of...

After upgrading to the latest version of ImageMagick JPEG 2000 support seems to be somehow broken. For instance, trying to do this: identify target.jp2 gives me a segmentation fault. Ditto for any other operations (convert, compare, etc.) on JPEG 2000 images. Other JP2 images give me errors such as:...

Hi, actually I'm pretty sure *is* a memory issue after all, as I've seen many examples of this behaviour before. If I use IM's 'identify' command when I'm logged in on Windows as a normal user, I'm getting a 'cannot decode code stream' error as well. When I do exactly the same thing from my administ...