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CImage:ExtractByte
The ExtractByte method creates a new image containing a byte plane from a numeric image. For example, this creates an image consisting of the high order byte of a ushort type image.
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bResult = CImage:ExtractByte( nPlane ) |
nPlane is the plane number, beginning at 1.
On success,
this method returns true.
On failure,
this method returns false.
Suppose that a CImage I exists and has long data type. The following script fragment creates 4 new images, one each for the 4 bytes of the original image pixels:
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S = CImageSet:new() |
-- create an image set to hold the images |
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for i=1, 4 do |
-- do for each of the 3 channels |
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Iplane = I:ExtractByte(i) |
-- extract the byte plane to a new image |
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S:Append( Iplane ) |
-- add to the end of the image set |
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end |
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I = S:GetImage(1) |
-- retrieve the lowest order byte plane |