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CImage:RgbExtract
The RgbExtract method creates a new image containing a channel from the original color image.
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bResult = CImage:RgbExtract( chan ) |
chan is the channel name, like "R", "G", "B", or
"A", or a corresponding number beginning at 1.
On success,
this method returns true.
On failure,
this method returns false.
Suppose that a CImage I exists and has RGB color data type. The following script fragment creates 3 new images, one each for the red, green, and blue channels (channels 1 through 3):
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S = CImageSet:new() |
-- create an image set to hold the images |
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for i=1, 3 do |
-- do for each of the 3 channels |
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Ichan = I = I:RgbExtract(i) |
-- extract the channel |
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S:Append( Ichan ) |
-- add to the end of the image set |
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end |
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I = S:GetImage(2) |
-- retrieve the green image... |