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Converting 8-bit image + pallete to 24 bit image with alpha channel [message #19309]

Thu, 09 March 2000 00:00

Ricardo Fonseca
Messages: 13
Registered: February 2000

Junior Member

Hi

I'm trying to convert an 8-bit grayscale image to a 24 bit image with an
alpha channel, mapping the colors of the 8-bit image through a palette.
Right now I'm doing it like this:

CT = 23
LoadCT,CT
TVLCT, rr, gg, bb, /get

Data = BytScl(Abs(Data), MAX = max, MIN = min)
s = Size(Data)
AlphaImage = BytArr(4, s[1], s[2])
AlphaImage[0,*,*] = rr(Data[*,*])
AlphaImage[1,*,*] = gg(Data[*,*])
AlphaImage[2,*,*] = bb(Data[*,*])
AlphaImage[3,*,*] = 128

Which works, but I was wondering if there was a more efficient way of doing
this. Can anyone help?

Thanks in advance, Ricardo

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Converting 8-bit image + pallete to 24 bit image with alpha channel

By: Ricardo Fonseca on Thu, 09 March 2000 00:00

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