Major color shifts

LH
Posted By
Lawrence_Hudetz
Apr 4, 2004
Views
400
Replies
3
Status
Closed
I have a problem with a major color shift in an image. It is a B&W that is colorized, however, before doing so, I use Color Range to pick out a range of gray values to which I am applying the colorizing. All was going well, I have a beautiful range of colors in this image, reminiscent of a tapestry, or even a rug. Deep blacks, subtle maroons and greens and an overall golden background color. I worked hours on this using the Color Range mask inverted, normal and without any mask at all. A total of but 6 or 7 layers.

So, I decided to print it flattened the file and….sh*t!! ALL the colors shifted. I mean HUGE shifts, in some colors even possibly inverted.

After many painstaking hours of investigation, it came down to this: I was managing at the file at full screen, had I carefully examined the image at 100%, I would have seen it. I actually did look at 100%, but only at the center where the color shift was least.

I have seen shifts before where flattening causes some value shift. It is most common when sharpening or using the Dust and scratches filter. When the process is complete, you notice a change in the file at full screen that doesn’t show up at 100%. That is why I was able to figure all this out.

Now, my problem is serious. I have this marvelous colorization at full screen that cannot print or used in any way. If I do all my manipulation at 100%, I cannot judge the overall result at full screen. It’s a Catch 22.

The problem is centered on the first use of the mask generated by Color Range. Had I flattened the file right then I would have seen the shift, and unfortunately, would also not obtain the result I did. I tried going back, flattening after each use of the Color Range mask, but I could never get what I got first off.

Is there any way around this? I have this great image, but I have nowhere to go with it. :-(:-(

MacBook Pro 16” Mockups 🔥

– in 4 materials (clay versions included)

– 12 scenes

– 48 MacBook Pro 16″ mockups

– 6000 x 4500 px

JL
John_Levine_IOPHFI
Apr 4, 2004
Well, I think you’ve stumped ’em, Lawrence! 😉

Sorry I couldn’t be of more help earlier, but I thought I’d give this thread a bump. It had dropped way down….
CW
Colin_Walls
Apr 4, 2004
Lawrence

Working at full screen is an arbitrary magnification. Do you get these big shifts at the mag "fixed points" – 25%, 33%, 50% etc.?
LH
Lawrence_Hudetz
Apr 4, 2004
I checked those as well, and what happens is that the shft gradually occurs as you hit first 16.66%, then 50%, then finally 66.66 to 100%. Those are the jump points.

In addition, dropping the file size to 10% (33M) of full allows me to flatten and print close to the screen image I created, but with posterization.

Another tidbit. The Info pallet tracks this shift. At screen size, a specific location checks out at L=62,a=21,b=30. Flattened I get L=34,a=27,b=17, thereabouts for both sets of readings. One is brownish yellow, like dark mustard, the other is maroonish.

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