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Anonymous
>>212487
You can't do it with filters or in post because there are filters on the photodiodes. The reason the technique works is because you capture a high-spatial-frequency grayscale image and rely on the characteristic that grayscale images have low noise.
You can't shoot a 100% pixel grayscale image in a DSLR because all the pixels have filters in front, and so only capture colored light. There's no way to extract straight luminance data from that except by converting in post, and that still relies on averaging the bayer pattern.
What you need is a grayscale CCD and R/G/B filters, then make four exposures. Won't work with any color CCD that I know of except MAYBE the foveon because you could sum all the exposures at a photosite and hypothetically use that as a luminance value.
Answer your question, fag?
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