How to blend colors?

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I'm trying to blend the 3 primary colors such as found in this webpage: https://www.exploratorium.edu/snacks/three-little-pigments#:~:text=Red%2C%20green%2C%20and%20blue%20...

Any ideas?

-Ronald

[Brad @ Roaring Mouse]

Not sure what exactly you want to do, but I am going to assume what you're looking for is a way to create the 4 (not 3) acetates like they have done for the image on this page for your own image so you can print out similar transparencies.

There are few ways to accomplish what you want. this is just one way (I'm sure other will jump in with other ways). First, you need to convert your image to CMYK mode if it isn't already. Also, in your Photoshop > Interface Preferences, check the button near the botton to Show Channels in Color.

Make 3 extra copies of the file. In the first copy (to make the Cyan copy), open your Channels panel, then select and delete the M, Y and K channels. This just leaves the Cyan channel. Export this as a JPG. It will be in RGB, but chances are you are printing to an RGB-based printer so it doesn't matter too much. Do the same for the other 3 colors, deleteing the 3 channels you don't need in each.

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Actually, I'm trying to blend colors between 3 letters of the alphabet where they meet.

[Brad @ Roaring Mouse]

Well, that's not at all what I thought you were doing on that webpage!

This is even easier. Put your separate letters on different layers and apply the Screen transparency effect on the top two layers (the Blue and the Red), like so:

 

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That makes a lot of sense, but while doing what you suggest, I get totally different results.

[Brad @ Roaring Mouse]

You have a white background. Remove that. That affects how the Screen/Lighten effect works. In your sample, on the top S, since Blue is not as Light as White, White wins out. Same with the Red S. The Green works because it's set as norm. Turn off the background and you will be fine. You may have to add a separate layer for the black strokes, as they are also affected.

 

[Brad @ Roaring Mouse]

Also: this might be a better project for Illustrator if you are looking for this to be an oft-used logo asset.

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Okay, I was able to make it work by removing the white background although I really wanted to see what it would look like with a white background. Anyhow, I do not find that logo idea very appealing after all. 

Anyhow, thanks for your time. I really appreciate.

[Brad @ Roaring Mouse]

You should also consider what these RGB colours will look like in print: (View > Proof Colors) can simulate what this logo would look like in your selected CMYK output space: Like so:

 

[Brad @ Roaring Mouse]

If you need to keep each layer as pure C M Y or K, and this may even easier, is to just make 4 copies of your CMYK image, then open each and FILL each of the other channels with White. like so;