CImage:ExtractChan
The ExtractChan method creates a new image containing a channel from the original color image.
CImage = CImage:ExtractChan( nChan ) |
nChan is string representing the channel name, like "R", "G", "B", or "A", or the corresponding channel number beginning at 1.
On success, this method returns a new CImage.
On failure, this method return nil.
Suppose that a CImage I exists and has RGB color pixel type. The following script creates 3 new images, one each for the red, green, and blue channels (channels 1 through 3):
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-- create an image set to hold the images |
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-- do for each of the 3 channels |
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-- extract the channel to a new CImage |
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-- add to the end of the image set |
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-- retrieve the green image... |
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CImage class, CImageSet:RgbMerge, ExtractByte
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