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Ingy döt Net 2023-07-01 11:58:00 -04:00
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commit cb5bb5e222
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Task/Bitmap-Read-a-PPM-file/Zkl/bitmap-read-a-ppm-file.zkl Normal file
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//24-bpp P6 PPM solution:
image:=File("lena.ppm","rb").read();
start:=image.find("\n255\n")+5; // Get sizeof PPM header
foreach n in ([start..image.len()-1,3]){ // Transform color triplets
r,g,b:=image[n,3]; // Read colors stored in RGB order
l:=(0.2126*r + 0.7152*g + 0.0722*b).toInt(); // Derive luminance
image[n,3]=T(l,l,l);
}
File("lenaGrey.ppm","wb").write(image);