Nicolas Hanson August 1, 2017 Share August 1, 2017 Is Rec/BT 709 and sRGB the same thing? Link to comment Share on other sites
Margus Voll August 2, 2017 Share August 2, 2017 They are very similar just gamma is bit different imo 2,4 vs 2,2. Link to comment Share on other sites
Mazze August 2, 2017 Share August 2, 2017 Depends on your pov - if you're just looking at the pure color space, then yes - they have the same primaries. However, sRGB is associated with a 2.199 gamma, and Rec709 with a 2.4 gamma (which then should be labeled BT1886, as that "combines" Rec709 color space and 2.4 gamma). Also, the curve itself is different - sRGB has compound, whereas Rec709 has a power law curve. Link to comment Share on other sites
Steve Shaw August 10, 2017 Share August 10, 2017 Actually, sRGB is 2.2, and Rec709 2.4 gamma. The concept of 2.199 comes from trying to 'average' the 'Encoding gamma' of sRGB, which has nothing to do with calibration or grading/image manipulation. BT1886 is an attempt to modify the 'shadows' based on the black point of a display, and is for calibration only - byt as issues as it lifts the shadows on a display that has lifted blacks... that ca be an issue when grading. A display with a zero black point will cause BT1886 to define a pure power law 2.4 gamma. Steve 1 Link to comment Share on other sites
