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What are accepted figures for signal/noise (SNR) and dynamic rangefor CRT? LCD? Film? Human eye?
I'm converting my old analog scanning electron microscopes to digital/pc
based. One of the important questions is how many bits of resolution ie: levels of greyscale are required. I've heard the analog front ends of the scopes have a maximum SNR of about 72 dB, or 12 effective bits, and to give me some flexibility for digital image processing that's about what I'll shoot for: a bit better if I can get it. But on the other end of the scale, I'm wondering what are accepted figures for signal to noise or dynamic range of various display technologies, and of the human eye. It seems to me the published "contrast" figures for LCD displays of about 600:1 peg them at about 49dB dynamic range. What is generally accepted for B&W film? Is it highly dependent on film type and processing? Anyone know some typical figures for various processes? Is "silver print," which in my mind is marked by high contrast, a special technique or just a fancy word for black and white? How about for CRT's? Deos it depend in part on the design and construction of the CRT, and do dedicated monochrome CRTs have a greater dynamic range for greyscale than color CRT's used to display greyscale images? And what about the human eye, for that matter? It's been suggested the human eye has only about 6 bits or 36 dB dynamic range/SNR for greyscale images. Is that about right? Bonus question: I know the sensitivity of the human eye varies with color, being most sensitive at about 555 nM green. How about dynamic range and SNR? Deos it vary with color, too? Thanks! -Jeff |
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Thread | Thread Starter | Forum | Replies | Last Post |
What are accepted figures for signal/noise (SNR) and dynamic rangefor CRT? LCD? Film? Human eye? | jeff miller | Digital Photography | 40 | March 10th 05 11:03 PM |