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Download the 4 sprites and 5 scripts of "Colors of GIF" and open it in Scratch Project Notes
Spacebar sets color dot to slider values. Up arrow and down arrow increments/decrements color code by one color step. Hit "a" key to cycle through all colors incrementing by the color step value. For more information on indexed color pallets, see http://www.scantips.com/palettes.html
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awesome
how do you change the variables from 0-100 to whatever you want?
I think Scratch brightness is actually a tinting or muting value, muting in the bottom half of the range and tinting in the top half.
"Brightness" in Scratch seems to be a combination of that and saturation lumped into a single control parameter. At least to my eye, the brighter the color, the more saturated it looks. Maybe the Scratch team can clarify some.
I've never understood, what exactly 'brightness' is doing in Scratch. It sure isn't reacting the way it does in my image editing apps, but rather seems to shift the color offset as a whole....