GIMP Version: 2.8.2
Operating System: Windows
OS Version: Windows 7
GIMP Experience: Beginner Level

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As a preamble, I warn you that I'm new to Gimp, that I often use in my work but I do not wish substitute me for a professional graphic design agency.
My case is particular I wish to ambience a new product of my company (I have hidden layers confidential images below) in order to present it to my colleagues, but between my result on screen in Gimp (. Xcf ) and the end result .jpg or .png colors are not the same, I find a lot duller.

What I'm doing wrong?

I want to show the images but it is impossible for me to post on the forum.
My post looks too spamy for a new user

Is the problem when you come to print the images?

This is from http://www.rgb2cmyk.org which does free on-line conversions.

...quote...
... Some RGB colors that you can see on your monitor (in particular, blue, green and all bright vibrant colors) cannot be printed and/or replicated with standard CMYK inks. Keep in mind that, [b]when creating a file for print, you should always make the original file in CMYK color mode before starting to work on it.[b]"
...unquote...

That last bit is not really possible in Gimp which works in RGB but you can make allowances for this.
One thing I find is that the default monitor brightness is far too high, what appears on the monitor is usually duller in print. Without going as far as a full calibration, you can do a simple check as here:
http://www.cambridgeincolour.com/tutori ... ration.htm

Likely a color management issue. It is likely that Gimp is using the color profile in the image but your display software isn't (or vice-versa).

When you display the final JPG/PNG what software do you use?

steeno,
After you have made 4 posts, you can then post your images by using the upload file button.

And you can post heavily very partial images so that no one will see the big picture....

It’s not for impression, not yet, it’s just a reaction of my colleague who has opened the file on her computer.
I have open my jpg and the colors are not the same than what I see in Gimp.

I will show you the photos on the next post.

Ofnuts, you’re right, I have installed and opened the files with xnview, I can see now the same colors than Gimp. That is not the case with windows photo viewer.

How can I adjust the windows photo viewer because my colleague doesn’t want to install another software to see my jpg. Is there a specific operation ?

I still not post my picture ... Maybe the next post ?

Just a thought but don't quiz me on it because I've never really had to play with this feature but under the menu edit>preferences is where you can change Gimp's default settings, one of the tabs you can change is the colour management tab.

Maybe gimp is running a different management system to your main computer, thats about as much help as I can be as I don't really know anymore than that about this feature.

Have you considered exporting your xcf image to a .tif format? I know publishers prefer that format. Gimp does have that capability.

Definitely it's a problem with windows photo viewer, only mine and for my colleague because I have tested with another colleague who hasn't the color bug.
I looked at the preferences but I saw nothing special, I will impose me see photos with xnview waiting to find the solution.

Now that I have finally managed to post my pictures on the forum, I can see that the results are identical. The problem is on windows photo viewer but I do not know how to fix it.

This is my Gimp view :



And the result in jpg :

You may have missed my post about tif images because you may have been posting your images when I was posting about tif. Check the French wiki about tif images.

Oregonian sorry, I missed your reply, I tried the format tiff which has the same result when i open the file with Windows Photo Viewer, but which is correct with xnview.

Other people's experience is that Windows Image Viewer assumes every image uses the sRGB profile, and if your photos have a different profile embedded, then you will usually see a duller image. http://social.technet.microsoft.com/For ... 4420754a91

Kevin

Well, I understand that I have to change my display software by default.

What software do you advise me ?

In the Control Panel, Color Management is where you'll probably fix this. Sometimes the device profile gets changed or should be changed with different graphics cards, monitors, printers, etc.
Have a look here.
http://windows.microsoft.com/en-US/wind ... t-settings

yes but that will change how steeno image viewer will display the files but not how his colleagues will see them.

But i can't see how it solve if Steeno collagues use a buggy image viewer (as Windows viewer), don't want install a better one and most likely don't want change their option in color management, the only paradoxical solution would be provide them a wrong file , wrong because adapted to the wrong setting used by the windows image viewer by default on your colleagues computers

Another method is to convert the image to some standard/default profile (sRGB). But it has a smaller "gamut" (shows less colors) so the image may look slightly better on the colleague's display, but will look worse everywhere else (not that if the image is meant for the web, it has to be profile-less anyway).

Thanks for your replys, I have seriously thought last night and I came to the same conclusion that Photocomix, I don't want change my picture which the colors are correct for me. I have tested the print it this morning and the result is really the same that I see in Gimp.
So I have decided to cheat with my colleagues, but shhh.
I have played with brightness and contrast to create a specific picture for them but with a appearance very near of mine. I will do the same process each time will be necessary.
I keep the original in state, maybe I will need to sent it to a professional printer.

It's not a colour management issue, it's simply a "feature" of the jpg format.

PNG uses lossless compression, so the colours show up exactly as they are in the XCF file.

JPEG compression is lossy, but also (and many do not know this) it does not use the RGB system. Instead, JPEG uses YCbCr, which means it doesn't save colours as accurately. The range of saturation is much lower in JPEG:s colour model, so the saturation of colours gets reduced, making the image look duller in JPEG than what it does in PNG.

This is acceptable for photographs, as real world objects very rarely have so highly saturated colours. This is why JPEG should only be used for photographs, and PNG used for anything else (at least when image quality matters).

Thanks for this clarification about the format and the quality of pictures.