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 Doom9's Forum YUV to RGB Conversion
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 26th February 2021, 08:34 #1  |  Link Valentin Nikin Registered User   Join Date: Feb 2021 Posts: 4 YUV to RGB Conversion Hello! https://en.wikipedia.org/wiki/YUV#Co...on_to/from_RGB Can someone explain to me where from Umax and Vmax coefficients? In BT.601 and BT.709 standards nothing about this values.
 26th February 2021, 09:06 #2  |  Link Sharc Registered User   Join Date: May 2006 Posts: 3,810 You won't find Umax and Vmax in the current ITU-R BT.601-7 document which refers to digital TV. U,V has its roots in analog color TV. Digital systems define Cb,Cr rather than U,V. You may find these links helpful: https://software.intel.com/content/w...ml?language=en The basic equations are Y'= 0.299*R' + 0.587*G' + 0.114*B' U'= -0.147*R' - 0.289*G' + 0.436*B' = 0.492*(B'- Y') V'= 0.615*R' - 0.515*G' - 0.100*B' = 0.877*(R'- Y') With R'G'B' in the range of [0,1] the maximum value of V' becomes 0.615 (for R'G'B'=[1,0,0]), and the maximum value of U' becomes 0.436 (for R'G'B'=[0,0,1]). For the various conversion matrices see here: https://web.archive.org/web/20120403...onversion.html For analog TV the "YUV - RGB Color Format Conversion" matrix applies. In the digital realm there is no U,V, but unfortunately it is often used in exchange of Cb, Cr which is not correct. Last edited by Sharc; 27th February 2021 at 15:26. Reason: Links and clarifications added

 Tags conversion, rgb, yuv