Effects > Colors > Grayscale |
 | Grayscale |
The Grayscale filter allows you to convert the image into a grayscale image. There are 256 shades of gray. Each pixel is a weighted average of the red, green, and blue components: A simple average of the colors is (red + green + blue) / 3 A weighted average in common use is (3 * red + 4 * blue + 2 * green) / 9 NTSC and PAL uses 0.299 * red + 0.587 * green + 0.114 * blue BT.709 uses 0.2125 * red + 0.7154 * green + 0.0721 * blue. |
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1. | Do one of the following: |
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 | | Choose Effects > Colors > Grayscale |
 | | Click the Grayscale button |  | |
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2. | Use the following options: |
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 | | Red (%) |
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This option allows you to specify the percentage of the red channel to use in the grayscale conversion.
Min = 0, Max = 100, Default = 21.
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 | | Green (%) |
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This option allows you to specify the percentage of the green channel to use in the grayscale conversion.
Min = 0, Max = 100, Default = 72.
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 | | Blue (%) |
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This option allows you to specify the percentage of the blue channel to use in the grayscale conversion.
Min = 0, Max = 100, Default = 7.
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 | | Strength (%) |
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This option allows you to specify the strength of the filter.
Min = 0, Max = 100, Default = 100.
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Using Preview Windows | Favorites and History |  |
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