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What is the quality of text with DSC?
by CaptainMarvel 7y ago
What is the quality of text with DSC?
- kurthr 7y agoThat is where some of the most challenging images come from... especially with white 4pt type against highly patterned backgrounds. However, frankly with a jeweler's loupe even on the most difficult images, I can't tell the difference flickering between compressed and uncompressed at 4:1. If you think about it, H264 is 100:1 compression (PNG 20:1) so it's not surprising that human eye visibility (especially at 10bit HDR and 8k) is excellent. For a quantitative estimate, PSNR is ~40dB even on fairly extreme images, which means less that those +/-1 code for 8bit sRGB. I'd expect even better from 10bit and natural images to be >45dB.
- CaptainMarvel 7y agoGiven what you have said, I am willing to be optimistic and no longer associate DSC with4:2:0 TV screens displaying text :) In particular your mention of PNG reminds me that it is lossless, so the idea of "visually lossless" at a much lower ~4:1 compression ratio seems more reasonable to me now.