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US 6,208,351 B1Granted
Conversion of alpha-multiplied color data
AssigneeAdobe Systems Incorporated
InventorsLars U. Borg, Mark Hamburg
Life of this patent
Estimating the term…
Abstract
Alpha-multiplied color data is converted into a form suitable for use in blending operations which does not generate a loss of color value precision or introduce significant color shifts into a blended object generated using the converted color data.
Claims24
A method of converting color values in a graphical processing system, comprising:
- obtaining a color value (FM) that represents a color in a color space, the color value (FM) being an alpha-multiplied color value of an original color value (F);
- obtaining an opacity value (α) that represents the opacity of the original color value (F);
- obtaining a matte color value (M);
- and
- generating a converted color value (F′), the converted color value (F′) being an approximation of the original color (F), the converted color value (F′) generated according to the following equation:
- F′=FM+(1−α)(M′−M)
- where M′ is a constant value that represents a substitute matte color.
4 more elements
A program storage device readable by a computer system and having encoded therein a program of instructions that includes instructions to:
- obtaining a color value (FM) that represents a color in a color space, the color value (FM) being an alpha-multiplied color value of an original color value (F);
- obtaining an opacity value (α) that represents the opacity of the
- original color value (F);
- obtaining a matte color value (M);
- and
- generating a converted color value (F′), the converted color value (F′) being an approximation of the original color (F), the converted color value (F′) generated according to the following equation:
- F′=F+(1−α)(M′−M)
- where M′ is a constant value that represents a substitute matte color.
5 more elements
The program storage device of 21 further including instruction to convert each color element in each sample of the image.
Dependencies are inferred from the claim text.