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CMYK Color shift when placed in a new photoshop file?


Andrea Breiholz

Andrea Breiholz

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Hi, I'm hoping I can get some help with this... I'm pulling my hair out.
I am working on a very large poster graphic and am coming across some odd issues, at least odd to me. I'm not sure the reasoning behind it, or if there is reasoning behind it? I must be doing something wrong.
I created a ribbon/wave graphic in photoshop in RGB color mode then converted to CMYK. I then cropped the large (310.875") canvas in to 4 separate images).

I created a new photoshop file for each canvas to then begin placing different text and graphics on each. The idea was to have the wave behind the images in the forefront of each poster be continuous and flow from one poster to the next. Once done I saved each poster as a tif and then laid them out in inDesign to verify the transition. To my surprise the color for each wave was off or slightly different than the other.

Any ideas as to what I had done wrong, or how I can correct this? This is my first time working on such a huge image, but this was rather unexpected and now I'm crunched up against a deadline. Any help or thoughts would be extremely appreciated.

Thank you.
Andrea
 
First, make sure that the unique layers added to each of the four sections haven't inadvertently changed the color of the background.

I would check this by going to each of the four files and then turning off all layers except the background wave and then use the eyedropper tool on some obvious landmark (or put a horiz and vert guide crossing at some fixed position).

What you then do next to continue the diagnosis will depend completely on whether the unique new material is causing the problem or the backgrounds truly are different. BTW, I strongly suggest using the eyedropper tool instead of your eye to look for differences to eliminate various subjective or oddball visual effects (eg, change in color with viewing angle to your monitor).

Tom M
 
Thank you for replying Tom, I guess I should have mentioned that the color shift occurs even without the added images. It seems to have just changed from making the actual crop. Which doesn't make sense to me, but I didn't do it the right way for such a large image?
 
just asking, you can have RGB TIFF and CMYK TIFF, could it be you're accidentally using RGB TIFF?
 
You are welcome, Andrea. I'm sorry that I suggested a test you had already performed. One never knows how thorough someone else is and just wanted to eliminate the easy things first.

Some more things in the category of easy-to-check:

a) Did you ck that the working color space is the same for all four copies? With all the CMYK soft-proofing profiles listed, and many with similar names, it's easy to inadvertently select a different one.

b) Did you check that you are really comparing the same areas in two adjacent copies. For example, if you inadvertently left a gap or overlapped during the crop process, the transition wouldn't be seamless.

Tom
 
Thank you Tom, I'm just going in and selecting Image> Mode> CMYK to do the conversion. I'm going to go back in see what I've done. Thank you for the insight. Cross my fingers I get this resolved tonight... Thanks again!
 
Thank you! You know that may be something I overlooked. I used the same process when converting all the images to tiff but I'm going to go back be more aware of my settings. Thank you again! :)
 
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