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Faster than looping? [message #16974]

Thu, 26 August 1999 00:00

Richard Tyc
Messages: 69
Registered: June 1999

Member

I am not that well versed yet on IDL subscript semantics but I am
learning!

Is there a faster way of doing the following for-loop code (it basically
looks for yellow in an RGB image and turns it white with intensity 254 .

img = bytarr(3,512,512)

for j=0,511 do begin
for k=0,511 do begin
if (img[0,j,k] eq 255 and img[1,j,k] eq 255 and img[2,j,k] eq 0)
then begin
img[0,j,k] = 254
img[1,j,k] = 254
img[2,j,k] = 254
endif
endfor
endfor

Thanks in advance

Rich

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