# SUB2r

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isp:white_balance

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 isp:white_balance [2019/05/09 00:54]Igor Yefmov [Practical example] isp:white_balance [2019/05/09 00:54]Igor Yefmov [Color correction for white temperature] Both sides previous revision Previous revision 2019/05/09 00:55 Igor Yefmov [What is white color temperature] 2019/05/09 00:54 Igor Yefmov [Color correction for white temperature] 2019/05/09 00:54 Igor Yefmov [Practical example] 2019/05/09 00:53 Igor Yefmov [Color correction for white temperature] 2018/06/04 09:10 Igor Yefmov created 2019/05/09 00:55 Igor Yefmov [What is white color temperature] 2019/05/09 00:54 Igor Yefmov [Color correction for white temperature] 2019/05/09 00:54 Igor Yefmov [Practical example] 2019/05/09 00:53 Igor Yefmov [Color correction for white temperature] 2018/06/04 09:10 Igor Yefmov created Last revision Both sides next revision Line 10: Line 10: For our purposes, we are using individual color channel **gains** to compensate for a given temperature. Lower temperature "white light" needs a lot of blue added to it and very little red and as the temperature climbs up, the amount of added red grows while the added blue goes down. For our purposes, we are using individual color channel **gains** to compensate for a given temperature. Lower temperature "white light" needs a lot of blue added to it and very little red and as the temperature climbs up, the amount of added red grows while the added blue goes down. ===== Color correction for white temperature ===== ===== Color correction for white temperature ===== - For the calibration purposes we have acquired a Philips "Hue White and Color Ambiance A19 LED Starter Kit" that allowed us to test various illumination scenarios for a range of color temperatures. For a given white color temperature setting we have dialed the red and blue gains to make the scene "​white"​ (leaving the green gain at its constant value of ''​1024''​). + For the calibration purposes we have acquired a Philips "Hue White and Color Ambiance A19 LED Starter Kit" that allowed us to test various illumination scenarios for a range of color temperatures. For a given white color temperature setting we have dialed the red and blue gains to make the scene "​white"​ (leaving the green gain at its constant value of $1024$). Corrections to the red channel were way more noticeable than those to the blue one so we approximated the blue gains' graph with a single line, described by the formula $B = 4205.4 - T*0.4087$. Corrections to the red channel were way more noticeable than those to the blue one so we approximated the blue gains' graph with a single line, described by the formula $B = 4205.4 - T*0.4087$.