image_formats - Representing Color Images Many color spaces...

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SSH-image_formats.fm-1-10/25/ Representing Color Images Many color spaces exist. Some examples: 1. RGB — red-green-blue. R, G, and B are highly correlated; this format is bad for image compression. 2. YCrCb — luminance and 2 chrominance components. Y Cb Cr 0.299 0.587 0.114 0.169 0.332 0.500 0.500 0.419 0.081 R G B = SSH-image_formats.fm-2-10/25/ Notice Cr is predominantly blue; Cb is predominantly red. Y contains gray-scale values only. 3. YUV — European analog TV (PAL). 4. YIQ — American analog TV (NTSC). 5. HSL — Macintosh color adjustment scheme. hue — what color is it? saturation — is it pale blue or deep blue? luminance — how bright is it? 6. CIE LUV, CIE LAB — to make colorimetry more accurate. We want an image to look exactly the SSH-image_formats.fm-3-10/25/ same when displayed on two different display devices. YCrCb were used when designing JPEG & MPEG; they are often called YUV, however. SSH-image_formats.fm-4-10/25/ Chrominance Cr and Cb (or U and V) contain much less information than Y and can be subsampled by 2.
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image_formats - Representing Color Images Many color spaces...

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