I'm printing out BW images and prior to printing I'm flattening the images. I just noticed that with some of the images when I flatten them there is a density change in the mid-tones. The mid-tones lighten slightly when flattened. Has anyone else experienced this? What would cause this? Several of the layers are in modes other than normal (ie multiply, screen, luminosity ....). Does flattening affect the layer modes?
I use a lot of layers with sometimes 40 or 50 layers and all blending modes. Mostly, when one does select all, copy merged and paste, the image is exactly as the component layers below. This occurs in 8 bit mode Adobe RGB. I can't remember whether or not it happens in 16 BIT mode.
It happens once in 30 times or so with complex multiple layers
So I add a second copy of the layer and then the color will be pretty well as expected and I again select all, copy merged and the new layer in a new document is normal 30% of the time.
Well what to do?
I add a curves layer and then go to multiply as the blend mode in a new document.
Here we have two ways of bringing back the tonality AND saturation to what you expect. One can change the slope of the mid tones with the introduction of a slight S curve and then reduce the percent of the layer to say 1-3% or so.
This can of course be done in two separate layers.
What is so fristrating is that sometimes everything is so perfect in a blend and one can't harvest the result even by all the tricks I know.
So I try to rebuild the image another way and use the un-harvestable layer stack as my target.
I imagine this is due to rounding off of numbers. Perhaps a different color space would be what we should be using, but then PS may not allow the layers we want?
I would love to know what we are doing wrong. It is certainly a problem.
I'm trying to remember whether or not it occurs in 16 bit images?
What bit level are you working in?