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Author Topic: Wrong colors when nesting multiple Images with differnt Color Spaces/Profiles  (Read 21423 times)
stz0001
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« on: June 17, 2023, 08:45:35 PM »

Hello,

I tried to print several images nested together, some in sRGB some in Display P3. It seems this causes a problem with rendering  Huh?

Some colors end up being "transformed" in some kind of different unusable solid color (I attached a picture of the two prints).

When separating the prints by profile, first batch all sRGB, second batch all Display P3 the problem is completely gone.

Does anybody have the same problem - or a solution ?

Thanks a Lot,

Stephan

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Terry-M
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« Reply #1 on: June 18, 2023, 07:18:28 AM »

I suggest you convert all images to the same colour space.
This can be done, without making ot a permanent change, in the image editor Auto Correct section, ICC overide.
See attached screen shot.
Terry
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stz0001
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« Reply #2 on: June 18, 2023, 07:47:15 AM »

Hi,

thanks for the fast answer. Does the feature ICC-Override convert the color space (with what rendering intent from larger to smaller space?) or just “assign” a different profile Huh?

I often must deal with pictures from different sources with different color spaces embedded (sRGB, Adobe, P3, etc.) and don't really want to waste time on converting / editing any files before printing...

Thanks, Stephan
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Terry-M
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« Reply #3 on: June 18, 2023, 08:19:13 AM »

Quote
Does the feature ICC-Override convert the color space (with what rendering intent from larger to smaller space?) or just “assign”
It 'assigns'. A QU image filter does not modify the basic image, other programs will not recognise it. QU applies the filter in QU only for screen and printing.
I don't think rendering intent applies to image conversions, only to prints.
Hopefull Mike will add some more detail for you.
Terry
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admin
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« Reply #4 on: June 18, 2023, 12:22:36 PM »

Qimage has absolutely no problem with printing images from different color spaces.  You can mix images with wildly varying color spaces like ProPhoto and sRGB on the same page without a problem.  It prints each image individually, converting straight from the image's color space to the printer profile so it makes no difference whether you print a mix of all from one color space and then all from another: the printing process is identical and each image is handled individually.

You have some other issue going on and seeing the problem differently in two different batches is a coincidence.  Take a look at your image that you attached here: on the one where there is a color problem on the shirt, there is fading and banding nearby that gets worse at the bottom of the print.  You have a nozzle problem: please do a nozzle check and make sure your printer is "healthy".

Regards,
Mike
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stz0001
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« Reply #5 on: June 18, 2023, 01:19:56 PM »

Hi Mike,

Thanks for the very fast replay!

It is not a nozzle problem – the fading is because I stopped mid print not to waste more paper and ink. But I can provide some more pictures if needed?

I also did a perfect nozzle check before posting here to be 100% sure – a clogged printhead was my first thought…
 
But now I tried it again (this time the other way round) – maybe some weird coincidence…

First print in batches on sRGB one Display P3 – no problem.
Second print all together – same problem with “weird colors”.

I also tried a different set of pictures (mix of Adobe RGB and sRGB) – also no problem.
It looks like this solely happens to me if a Display P3 picture (from an iPhone) is involved…

Edit 1: I just noticed; the affected parts are always within the “gray” area in soft-proof (gmt on).
Edit 2: I tried what Terry-M suggested, assigning a sRGB profile to the "Display P3 pictures" with the editor; This also solves the problem.
Edit 3: Different Paper with Manufacturer Profile – no difference.

Now I am really running out of ideas… Sad

Do you have any other hints for me? There is something very weird going on with profiles not the printer…?

Stephan



« Last Edit: June 18, 2023, 02:55:28 PM by stz0001 » Logged
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« Reply #6 on: June 18, 2023, 03:15:24 PM »

No.  I don't have any other ideas.  The images would have to be corrupted in some way to produce that problem.  There is zero difference between printing all of one color space at once or a mix.  Qimage reads and prints every image as if it was the only image in the job: it has no knowledge of what printed before or after it when it is processing an image.  So it is going to do the exact same thing to every image regardless of whether each image has a different profile or the same one: read one image, get the ICC profile (color space) out of that image, convert from that color space to the printer profile.  Then proceed to the next image and do the same.

If there is corruption in the image(s), all bets are off since we don't know how they might be corrupted.  You might want to put a few samples of those iPhone shots on Google drive or provide a link so I can look at them and see if there is a corruption or incompatibility involved.  A further clue that it might be corruption are your examples you have been posting.  There isn't enough difference between sRGB and Display P3 to produce those gray areas: that is a sign of (usually profile) corruption.  If you put Display P3 on an image instead of sRGB (or vice versa) you'd be hard pressed to tell the difference.

Mike
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stz0001
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« Reply #7 on: June 18, 2023, 03:36:36 PM »

Hi Mike,

here is a link to my test-image:

https://drive.google.com/file/d/1d9arsYmfs8XoQ-Qh3hhJteVap8NfS5nt/view?usp=sharing

I hope you can find something – this would help a lot!

Stephan
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« Reply #8 on: June 18, 2023, 04:37:26 PM »

Thanks for the image.  See attached.  On the left is the image printed by itself.  On the right it is intermixed with sRGB images.  Both look identical.

I printed twice, once with the page with just the one image on it.  Then I created a new job by mixing sRGB images on the same page.  I turned on print preview so I could capture the attached results but the actual prints are identical as well.  Not seeing any problem.

Have you tried turning on print preview and looking at the driver preview to see if that shows the problem?  That would at least rule out the printer.  The preview may not have "accurate" color but you'd definitely see a difference like the ones you've been posting.

Mike
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stz0001
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« Reply #9 on: June 18, 2023, 06:53:40 PM »

Hi Mike!

I’m really impressed by your level of service! Thanks a lot!

Meanwhile I did the following:
-   Completely removed the Printer Driver and all Canon Tools for the ipf6400.
-   Completely removed other Canon Printer Drivers and Printer Software (I have two cad-plotter at work).
-   Reboot.
-   Reinstalled only the ipf6400 printer, the absolute minimal installation without any additional Canon Tools. This time the English version.
-       Printer settings exactely the same as before.

The result:
-   I tried several test prints, all with different color-profiles mixed, also the problematic combination from before.
-   All problems gone – prints look perfect again!!!

I still have no clue where it came from, but it seems to be gone.

Thanks for your patience. I hope I can now enjoy printing with Qimage

Stephan





« Last Edit: June 18, 2023, 06:55:30 PM by stz0001 » Logged
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