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CImage:CreatePixelMaskLow
The CreatePixelMaskLow method creates a pixel mask file containing the coordinates of pixels having values below a threshold value.
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bSuccess = CImage:CreatePixelMaskLow( sMask, vLow, CRect=nil ) |
sMask is the name of the text file where the pixel
mask will be saved.
vLow is the low threshold value.
CRect is the target rectangle; if nil, then the entire image is
searched.
On success,
this method returns true.
On failure,
false is returned.
This method produces a text file consisting of pixel coordinate pairs, one per line, in the form column, row. This format is described in the topic Pixel Mask File.
The following script fragment makes a pixel mask containing the coordinates of pixel values below -32000. The entire image is sampled because the CRect R is not specified:
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I = CImage:new() |
-- Create a CImage |
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I:Open( sPath ) |
-- Open the image from sPath. |
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I:CreatePixelMaskLow(sMaskFile,-32000) |
-- create the pixel mask |
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I:delete() |
-- delete the CImage from memory |