DriverHeaven.net - View Single Post

arfster · Apr 17, 2008, 09:04 PM

One key fact explains 99% of the differences observed in the article: by default, ATI 2xxx/3xxx series cards expand the colour space to PC levels (ie 0-255), presumably because they think most people will be viewing on a PC monitor. Note this doesn't apply to SD - ATI bizarrely expand HD but not SD, and you have to apply registry tweaks to get them to behave consistently (I've been complaining to their tech support for 9 months about this, but no resolution).

For a fairer comparison with Nvidia, I'd suggest reversing the expansion via brightness16/contrast86 (this uses the same bt709 method as the original expansion, so it's near lossless).

Apr 17, 2008, 09:04 PM	#32 (permalink)
arfster DriverHeaven Newbie Join Date: Apr 2008 Posts: 4	One key fact explains 99% of the differences observed in the article: by default, ATI 2xxx/3xxx series cards expand the colour space to PC levels (ie 0-255), presumably because they think most people will be viewing on a PC monitor. Note this doesn't apply to SD - ATI bizarrely expand HD but not SD, and you have to apply registry tweaks to get them to behave consistently (I've been complaining to their tech support for 9 months about this, but no resolution). For a fairer comparison with Nvidia, I'd suggest reversing the expansion via brightness16/contrast86 (this uses the same bt709 method as the original expansion, so it's near lossless). Last edited by arfster; Apr 17, 2008 at 09:18 PM.