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<blockquote data-quote="jameson_uk" data-source="post: 838808" data-attributes="member: 11220">I am not that clear on how it works but I have measured stuff and I know it is not that simple....AIUI there are various issues with different decoders not passing the right flags through to DXVA hardware and then you also have the drivers messing around with stuff and sometimes ignoring the flags anyway.&nbsp;&nbsp; I also believe some parts of the chain do not cope with the difference between REC.601 and REC.709 and whilst it should be possible to convert properly they do not.On top of that you then have the issue that protected path stuff does something different to normal playback so getting consistent black levels is a real problem.Yes...&nbsp;&nbsp; trying to get consistent black levels is a real problem.&nbsp;&nbsp; Currently I have my 9400 IGP set to output at 0-255 which actually gives me 16-235 output from a 16-235 input.&nbsp;&nbsp; If I set output to 16-235 (which I previously calibrated my TV for) I actually get a mess as somewhere along the chain it decides the input is 0-255 and needs converting to 16-235 so black ends up somewhere like 35 and I get grey blacks and crushed whites (which does not look good).I am also using XP so VMR which does not help but I have also played around with my Win7 Sandybridge machine (so EVR) with similar results.It just irritates me that if a £60 bluray player can manage this why a high-tech graphics card and software can not...If anyone wants some light reading then... <a href="http://www.curtpalme.com/forum/viewtopic.php?t=10457" target="_blank">GREYSCALE &amp; COLOUR CALIBRATION FOR DUMMIES</a>but PC hardware seems to complicate this a great deal...</blockquote>

[QUOTE="jameson_uk, post: 838808, member: 11220"] I am not that clear on how it works but I have measured stuff and I know it is not that simple.... AIUI there are various issues with different decoders not passing the right flags through to DXVA hardware and then you also have the drivers messing around with stuff and sometimes ignoring the flags anyway. I also believe some parts of the chain do not cope with the difference between REC.601 and REC.709 and whilst it should be possible to convert properly they do not. On top of that you then have the issue that protected path stuff does something different to normal playback so getting consistent black levels is a real problem. Yes... trying to get consistent black levels is a real problem. Currently I have my 9400 IGP set to output at 0-255 which actually gives me 16-235 output from a 16-235 input. If I set output to 16-235 (which I previously calibrated my TV for) I actually get a mess as somewhere along the chain it decides the input is 0-255 and needs converting to 16-235 so black ends up somewhere like 35 and I get grey blacks and crushed whites (which does not look good). I am also using XP so VMR which does not help but I have also played around with my Win7 Sandybridge machine (so EVR) with similar results. It just irritates me that if a £60 bluray player can manage this why a high-tech graphics card and software can not... If anyone wants some light reading then... [url=http://www.curtpalme.com/forum/viewtopic.php?t=10457]GREYSCALE & COLOUR CALIBRATION FOR DUMMIES[/url] but PC hardware seems to complicate this a great deal... [/QUOTE]

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