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Index › Programming Questions & Help › Syntax Questions › Export on Grayscale and not on RGB
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Export on Grayscale and not on RGB? (Read 567 times)
alekuh
Export on Grayscale and not on RGB?
Jul 21st, 2007, 8:57pm  
Hi all,

I want to export images/sketches from processing in GRAYSCALE(black and white only,8bit) colormode, not RGB.

(the reason is that im importing them realtime to matlab, so each of R,G,B are imported as different matrix-or better as an [X x Y x 3] matrix. I need one matrix made of BW colors , u see...)

Is there any chance to change Pro124 colormode into GRAYSCALE ?

best,
alekuh
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fry
Re: Export on Grayscale and not on RGB?
Reply #1 - Jul 21st, 2007, 9:43pm  
you can do it with a hack..

Code:
// Copy everything from the screen
PImage img = get();
// Make it grayscale
img.filter(GRAY);
// Use undocumented image format (for fonts)
img.format = ALPHA;
// Save as targa format (only works w/ targa)
img.save("gray.tga");

The hack part is that ALPHA format images (where one channel determines transparency--this is used for fonts) are saved as 8-bit grayscale when saved in targa format.
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