4 ms·
Very clearly shows much more sensitive our eyes are to luminance rather than hue or saturation, which was the main observation that allowed for the high compres
by kouru225 1y ago
Very clearly shows much more sensitive our eyes are to luminance rather than hue or saturation, which was the main observation that allowed for the high compression rate of JPEG
- dinkelberg 1y agoAre you speaking of chroma subsampling, or is there a property of the discrete cosine transform that makes it more effective on luma rather than chroma?
- ricardobeat 1y agoProbably chroma subsampling - storing color at lower resolution than luminance to take advantage of the aforementioned sensitivity difference. Since it’s stored at 1/4 resolution it can alone almost halve the file size. Saying it’s the insight that led to JPEG seems wrong though, as DCT + quantization was (don’t quote me on this) the main technical breakthrough?
- dinkelberg 1y agoChroma subsampling was developed for TV, long before JPEG.