"He who marches out of step hears another drum." ~ Ken Kesey
RGB = Additive Light Mixture. A Black Neutral Greyscale Layer in RGB Mode is the exact same thing as the single-channel version of one of those channels as a spot-channel, or as a greyscale. The Black layer composite being shown in layers is perfectly representative of the actual ink % levels especially at flat-line zero dot-gain simulation. As opposed to multi-channels or greyscale which shows a LIGHTER on-screen simulation of the actual ink % levels in the channel, or if it's white over a black shirt color it does the OPPOSITE. Therefore channels do not by their very nature show accurate simulations of ink % levels, period. The Red, Green, Blue are ADDED together as COLORED LIGHT. Therefore 50% of green light (darker than white), plus 50% of red light, + 50% of blue light = 50% GREY simulation. The channels are not being "multiplied" together as BLACK. In another thread you went so far as to say that the tone-curve tool in photoshop cannot "CLIP" out or re-assign values... when if you knew how the tone-curve tool works and maybe if you read the posts before that one you would see the answers given, and YES you can clip % values with the tone-curve tool. NO Dan it does not just push the lighter % into the darker areas, you CAN actually just CLIP out the % you don't want, or just re-assign them.It's obvious you like to call things hocus pocus and snake oil. But so far the "information" you are sharing to "refute" the supposed snake-oil, is nothing but hog-wash.Do you not understand how the application actually works with additive light and subtractive virtual simulations??I think I have personally shown twice now the factual, mathematical ---- ERRORS that arise when SPOT-CHANNELS are used to show BLENDED CONTENT. They are meant for SPOT-colors. As soon as you try to show blending you face all the problems with a zero-dot-gain simulation showing dot-pull instead of the actual ink % levels that are there... unless it's white over black. In fact, I can take the same 2 channels, one as white, the other as black, and the white one shows as gaining while the black shows as being lighter. WTF. Tell me how that makes any logical sense at all. The same gradient, it would be ripped to the same halftone values, and yet the darker colors show as if they will somehow have dot-LOSS, and the lighter ink values will show dot-GAIN.I'm really disappointed I thought you knew more about these things but post after post shows the opposite.EDITED by blue moon without posters consent to clean up. See post below for more info.