Search found 9 matches

by Phergus
2019-06-02T07:50:42-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

IM and Gimp and Microsoft Photo Viewer can all read your bfoz014_1.jpg, and they all show similar wrong colours. Neither GIMP nor MS Photo Viewer can handle CMYK images so, of course, they show it wrong. I suspect the problem is in the file, not the programs. And yet the source PDF displays correct...
by Phergus
2019-05-27T07:08:16-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

One of my replies apparently didn't make it. Probably one of the frequent network outages we've been experiencing lately. By "the colours in bfoz014_1.jpg are screwed up", I meant that when converting that CMYK JPG to sRGB, I can't get the colours to be close to your "correct" version. For example, ...
by Phergus
2019-05-24T18:02:53-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

If the JPG was imbedded as RGB but the PDF vector shell was coded as CMYK, then the JPG might be tagged as CMYK rather than its proper RGB. Just a guess. That is a possibility though I think it might present an issue during JPEG decoding as it software expecting 4 channels of data (CMYK) would run ...
by Phergus
2019-05-22T17:15:47-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

I have no idea what your java program is doing or even if it is correct code. But as it appears to be displaying wrong. That PNG matches the PDF the JPEG came out of, which matches the published book from the same source. What you posted is what you get if you have CMYK image data and display it as...
by Phergus
2019-05-22T05:25:12-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

Actually, this is what it should look like. https://www.dropbox.com/s/ab2xgjkmatfsidk/CorrectColors.png?dl=0 Curiously, if I display it with a little Java program it looks correct. GIMP can't handle it but has no CMYK support so not unexpected. IrfanView treats it like RGBA. The ImageMagick viewer d...
by Phergus
2019-05-21T19:36:36-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

FWIW, here is a link to one of the images.

https://www.dropbox.com/s/tq8kiub1b15o3 ... 1.jpg?dl=0
by Phergus
2019-05-21T19:28:55-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

... I would dearly love to convert to sRGB images ... -profile AdobeRGB1998.icc If you want sRGB images, use a sRGB profile. AdobeRGB1998 is not sRGB. Thank you. I am aware of that but I haven't found an actual sRGB profile file yet. For that matter, the CMYK profile is just one I chose at random. ...
by Phergus
2019-05-21T19:26:28-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

Just use profiles as you show above. If your input has a CMYK profile, then only use the RGB profile in your command. Use two profiles only when the input has no profile. You can test for profiles with the %[profiles] and %[profile:icc] and %[profile:icm] string formats. see https://imagemagick.org...
by Phergus
2019-05-21T16:42:30-07:00
Forum: Users
Topic: CMYK jpg to sRGB png
Replies: 23
Views: 8671

Re: CMYK jpg to sRGB png

I have a number of CMYK JPEG files that I would dearly love to convert to sRGB images in PNG or whatever. I'm on Windows 10, using ImageMagick 7.0.8. They appear to not have a profile but I'm not sure about that. What is the right sequence of command line options to convert these images? I have been...