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.
1. Do one of the following:
 Choose Effects > Colors > Grayscale
 Click the Grayscale button on the toolbar
2. Use the following options:
 Red (%)
This option allows you to specify the percentage of the red channel to use in the grayscale conversion.

Min = 0, Max = 100, Default = 21.
 Green (%)
This option allows you to specify the percentage of the green channel to use in the grayscale conversion.

Min = 0, Max = 100, Default = 72.
 Blue (%)
This option allows you to specify the percentage of the blue channel to use in the grayscale conversion.

Min = 0, Max = 100, Default = 7.
 Strength (%)
This option allows you to specify the strength of the filter.

Min = 0, Max = 100, Default = 100.
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