[Bug 13872] TV-Out show bright white colors as black/white noise

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=13872


Robert Nelson <robertcnelson at gmail.com> changed:

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                 CC|                            |robertcnelson at gmail.com




--- Comment #5 from Robert Nelson <robertcnelson at gmail.com>  2008-01-21 17:44:56 PST ---
Seeing this also on my mythbox's RV350, within the menu buttons of gnome, xvid
movies, and dvd's. 

Using test images from here: http://www.lagom.nl/lcd-test/  (even thou they are
lcd specfic, they do show up on my ntsc tv.)
It'll fail the White Saturation Test 254
Inversion test 6a & 6b
and the bottom two right in the response-time test.

Found a little note here on NTSC signals and the results with highly saturated
colors.. https://computing.llnl.gov/vis/guidelines.shtml

Which I believe we are all seeing...

And a note about making images NTSC complaint, they recommend color values
within 16 to 235 : http://people.csail.mit.edu/tbuehler/video/titles.html

Can't really test at the moment, mythbox is busy recording and the spare test
rig is down, but there looks to be gain controls for Y and UV in radeon_tv.c
located here:

 717     save->tv_gain_limit_settings = (0x17f << RADEON_UV_GAIN_LIMIT_SHIFT) | 

 718                                    (0x5ff << RADEON_Y_GAIN_LIMIT_SHIFT);

 724     save->tv_linear_gain_settings = (0x100 << RADEON_UV_GAIN_SHIFT) |

 725                                     (0x100 << RADEON_Y_GAIN_SHIFT);


Regards,

Robert


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