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please help - image changes color at the bottom of image

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please help - image changes color at the bottom of image

Postby Writersblot » Mon Dec 13, 2010 5:16 pm

Hello there,

Please help me figure out the problem. I have been using gimp to create designs that end up on all sorts of items like tshirts posters and buttons and so on. I have noticed an odd thing, and I don't know what the source of the error could be.

If I have an image with lots of rich colors, patterns, and layers in Gimp, the color of the entire image seems to 'lighten' up progressively towards the bottom of the image.
Even when the image is flattened into one layer, and turned upside. The bottom portion of the image will still be lighter than the top.

This carries alway through to when image is printed onto a surface. A customer complained of big color variation between top of product and bottom of product. In this case it was an iphone case.

Has anybody experienced this issue?

I'm using Gimp 2.6 on Ubuntu Studio,
9.1 Karma Koala
CISNET pentium 4 (onboard graphics card)
LCD monitor

is it Gimp, Ubuntu OS, the graphics cards, the monitor settings?

Please help and thanks for your time.
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Re: please help - image changes color at the bottom of image

Postby Arzoroc » Mon Dec 13, 2010 8:11 pm

If you view the finished image outside of GIMP, e.g. on IrfanView or some other picture viewer, does it still look the same?

is it Gimp, Ubuntu OS, the graphics cards, the monitor settings?


-Gimp: I have never heard of that problem in Gimp, you might try to reinstall it and see if it's the same.
-Ubuntu: Well .. no. I don't think Ubuntu has got anything to do with this. If you want to be a 100% sure, send the files to a Windows/Mac computer and see whether it comes out the same way.
-Graphics Card: As above, I don't think the graphics card would effect a data. It could show you something in a wrong way, but if you print the image, the GPU has no further influence and the picture therefor should be colored correctly. As I said above, try it on another Computer to get a 100% proof.
-Monitor settings: Same here as on the GPU.

Well, I've never had this problem, and I haven't heard about it either. Are you sure you didn't do any mistakes while making the XCF in GIMP? For example some layer with a transparent-to-white gradient on low opacity that gives the whole image this look?


If you haven't got another computer and if you trust us well enough, you could upload the XCF file here and we'll have a look at it to see whether there's a mistake inside.


P.S: Any grammar mistakes are intended. ::) ;)
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Re: please help - image changes color at the bottom of image

Postby Maffe811 » Mon Dec 13, 2010 8:40 pm

Arzoroc wrote:If you view the finished image outside of GIMP, e.g. on IrfanView or some other picture viewer, does it still look the same?

Writersblot wrote:This carries alway through to when image is printed onto a surface.

Can you do your normal process and figure out when it goes wrong...
Could you post an image so we can check if it works for us...
And could we try making sumthing and send it to you for test print...
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Re: please help - image changes color at the bottom of image

Postby Guest » Mon Dec 13, 2010 9:51 pm

Thanks for your replies.

I will look at the image in a windows OS and let you know.
and fish out the best example of this issue in an image and post it.

thanks again,
writersblot
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Re: please help - image changes color at the bottom of image

Postby Guest » Mon Dec 13, 2010 10:51 pm

Here is the situation

I looked at the image in a Window XP using built in image viewer application. The image color is slightly darker at the top, even when I turn the image upside down. But this doesn't happen to all images...just the COLOR images I create with GIMP.

Okay...I think it's the LCD monitor. I just made two copies of this file...looked at them both side by side through image viewer. - then I moved one image further down the monitor screen, it gets just slightly lighter.

But how can this affect the printing so dramatically? I don't do the printing myself. I just heard through client that there was a difference in color hue between top and bottom of image.

Here is a temp link to the image - i've peared down the image and reduced the resolution and size.
http://www.writersblot.com/gimp_test/TESTSM.png

this image has one solid color #da2a5b at opacity of 29% over a solid white layer both at MODE: Normal, and other transparent layers.

thanks so much for your time.

regards,
writesblot
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Re: please help - image changes color at the bottom of image

Postby David Wood » Tue Dec 14, 2010 3:15 am

It sounds like it's just the monitor, have you tried recalibrating it? As in regards to printing it shouldn't effect it at all, it's just the way the monitor sees the colors not the printer, I would try a test print and see if it looks different.
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Re: please help - image changes color at the bottom of image

Postby Maffe811 » Tue Dec 14, 2010 9:26 pm

Guest wrote:Here is a temp link to the image - i've peared down the image and reduced the resolution and size.
http://www.writersblot.com/gimp_test/TESTSM.png


Nada problems on my dads screen, and thats a hyundai (no not a car, a lcd screen) something....
so... i honestly dont know...
i would fix the screen and take it from there...

maybe there is some wierd connection between the screen and the printer... 8O
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Re: please help - image changes color at the bottom of image

Postby Rod » Sat Dec 18, 2010 6:09 am

Yeah that sounds like a monitor problem.
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Re: please help - image changes color at the bottom of image

Postby Arzoroc » Sat Dec 18, 2010 11:19 am

But then the prints shouldn't be lighter at the bottom aswell.
Try using another printer, just to be safe.


By the way: Nice design :D
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Willy wrote:arzorac

Maffe811 wrote:Arcoroc

David Wood wrote:Arzorac

sagtek wrote:Arzonic

Legionenigmatics wrote:azornac

Cyrilshark wrote:Argzornack, I still have to congratulate you on having the most epic signature ever. haha

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Re: please help - image changes color at the bottom of image

Postby Maffe811 » Sat Dec 18, 2010 4:23 pm

check list:
1. fix/change screen
2. try different printer
3. say thank you to Arzoroc/baum for saying nice design
4. say thank you to Maffe811 for saying nice design

Nice design ;)
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Re: please help - image changes color at the bottom of image

Postby Rod » Sun Dec 19, 2010 4:55 am

Wow i just looked at the image you uploaded and it does fade at the bottom.Are you sure you are not using a gradient mask there?
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Re: please help - image changes color at the bottom of image

Postby Maffe811 » Sun Dec 19, 2010 4:45 pm

Image
Did this so you dont have to scroll up all the time!

I see nada fading
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Re: please help - image changes color at the bottom of image

Postby Arzoroc » Sun Dec 19, 2010 4:48 pm

I loaded it in GIMP and picked one pink spot at the very bottom and one at the very top with the Color Select tool. They were exactly the same.
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Willy wrote:arzorac

Maffe811 wrote:Arcoroc

David Wood wrote:Arzorac

sagtek wrote:Arzonic

Legionenigmatics wrote:azornac

Cyrilshark wrote:Argzornack, I still have to congratulate you on having the most epic signature ever. haha

*bow*
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Re: please help - image changes color at the bottom of image

Postby Maffe811 » Sun Dec 19, 2010 5:01 pm

so only thing we have gotten out of this is that Rod's screen is off as well? :|
Are we stuck ?
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Baum wrote:I think it doesnt has to be mentioned that self-voters have a small p....hotograph :D
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Re: please help - image changes color at the bottom of image

Postby Rod » Thu Dec 23, 2010 5:05 pm

nah its just an optical illusion.
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