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Pocket Artist - Documentation



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Documentation - Colors and Blenders

Several parts of this documentation refer to Blenders, Color Blenders, or Blending Mode. They are all discussed here. A list of blenders that Pocket Artist supports is in the image to the right. Blenders are a way of mixing two colors to provide a new one. They can be simple (such as the Normal blender, in which the color on top replaces the color on the bottom), to complex (such as the Overlay blender, which involves several factors, overall giving the appearance of a colored transparency overlay. Below are descriptions of the blenders. In the descriptions, two picture layers are assumed (much like when you have a floating selection ontop of a document -- they both have color data and a blender can be associated with them). The blenders that the painting tools utilize can be pictured as having a layer of a solid color (the foreground color) ontop of the picture you are painting on.

Normal: this blender is the easiest, and simply involves replacing the bottom color with the top color.

Multiply: this takes the two color values (on a 0 to 1 scale) and multiplies them together, yielding something darker than the original (since two numbers between 0 and 1 multiplied together is always smaller).

Screen: this is somewhat the inverse of multiplication, yet a little different. It is not quite division, but the resulting color is always brighter than the two colors that combine to form it.

Overlay: this is a complicated blender that combines both Multiply and Screen to form a blending mode that acts as if the top layer is like a color transparency that overlays ontop of the bottom layer.

Hard Light: this blender acts as if it is providing the lighting for the bottom layer. It blends the two colors by having the top layer "light up" the bottom colors.

Darken: this simple blender yields a color that is the minimum of the two colors.

Lighten: the opposite of darken, this blender take two colors and outputs their maximum.

Difference: this blender takes two colors and computes the absolute value of their difference, and results in that. Therefore, large color differences are seen as brighter, and where colors are more similiar, the result is darker.

Exclusion: this blender is somewhat like Difference, yet when the top and bottom colors approach the same value, the result is grayish instead of black.

Hue: this blender takes the hue of the top color (that is, Red, Yellow, Cyan, etc.) and makes the bottom color have the same Hue. It retains the saturation (how "rich" the color is, or how "washed out" it looks) and its luminosity (how bright it is).

Color: this blender takes the hue and saturation of the top color and makes the bottom color have these same values.

Saturation: this blender makes the bottom color have the same saturation (richness) as the top color.

Luminosity: this blender makes the bottom layer have the same luminosity (brightness) of the top layer.

>> Effects

 

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