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I'm trying to do a Graphic Design of some blocks using a certain color palette.
The way I did the highlight and shadow colors is to multiply the colors by 2 and 0.5 respectively, clipping if needed.
With black, what happens is that it looks like it's been painted with Black 2.0 and vantablack (they're blacks that absorb almost all light).
What do I do?
A simple fix would be to simply draw an imaginary dark gray for black highlight.
Link to project: https://scratch.mit.edu/projects/226893795/
I don't really understand the question to be honest. The black would need to break your formula to maintain a viable visual appearance. Using lighter shades to indicate where shadows fall in other colors and, well, no idea why you set the highlight to black as well.
You won't be able to use one single formula for every color. Black and white typically take other consideration.
A well-lit irregularly-shaped high-gloss finish black object will exhibit white highlights where the luminary is reflected toward the viewer.
A well-lit irregularly-shaped semi-gloss finish black object will exhibit grey highlights where the luminary has a retro-reflecting surface toward the viewer.
Either of these physical phenomena can be demonstrated by simple means in real life.
It is entirely possible that a mathematical formulation of this (above experimental observation) using an arbitrary (limited, truncated, discontinuous, etc.) contrast scale will fail to represent reality with any fidelity.
Therefore, abandon one of your fixed conditions. Use what we call an "artist's interpretation" of the expected results. In other words, cheat!
RealWorld Cursor Editor is a capable multilayer raster image painting program & editor for its intended purpose. You can use layers+blending modes to make shadows and highlights. There are plenty of possiblities. You can for example use blending mode "replace brightness". If you add separate layers for making the shadows and highlights, you can have different blending modes, too.
BTW full black has no room for shadows just like white has no room for highlights. Consider to use less extreme greys instead.
