My business partner and I are trying to decide between white and black fonts for our latest project. The problem is that the background colour that I have imported as a PDF on my first layer changes contrast according to the font colour. Darker for black font and lighter with light font which totally throws out our entire design. I have locked the first layer that has the PDF background and used other layers for text and locked them accordingly however this makes no difference at all.
There does appear to be differences in color in the mock-up on the stool, but I think that's a lighting difference from one bag to the other.
In the screenshot of the artboard, you are dealing with an optical illusion. The upper pair is slightly different from the lower pair, but each member of each pair matches its partner.
Yes, there is a change of contrast between the lettering/outline and the background color, pretty much by definition, when you change from black to white, but the background color does not change.
I am not saying that you do not have actual visible differences in the colors; indeed, the background with the dark text appears to be a bit darker, but my results on my machine from the images you have provided show differences so small as to be nearly undetectable.
I made clips of the same area of both the left and right labels of both colors and added outlines and text with colors sampled from your images. I am showing here the results of the green labels. I took color readings, to the best of my ability, of the same pixel in each image. While not identical, they are so very close as to be visually indistinguishable.
So I am unable to confirm a problem. Sorry.
Are you placing the PDF or opening it in Photoshop?
I have tried both. I have also saved it as every file imaginable, flattened the layers and nothing at all has made this change 😞
I wonder if it has anything to do with color management settings, although I've actually never seen this happen before.
Is it possible that you could upload the file for us to take a look at it?
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The backgrounds are the same. It's an optical illusion.
e.g. I copied a section of the middle of the left one and placed it over the same spot in the right one; they are identical.