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Hi Aaron,<br>
<br>
<blockquote
cite="mid:mailman.221.1241999577.14192.mythtvnz@lists.linuxnut.co.nz"
type="cite">
<div class="Section1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Colours
don’t look natural. Broadcast video uses colour levels
in the range 16 – 235, while PCs use a colour range 0 – 255. So my
graphics
card is sending out video as 0 – 255, however the TV has now switched
itself to
“broadcast” mode and is interpreting the colours in the range 16-255.
Which
means, the colours at the top and bottom end of the range are all
collapsed
together. Darks and lights have lost a lot of definition and contrast.
Again,
high end TVs often have the ability to allow the user to switch colour
modes –
the Sony Bravia V Series does not. (Although I did find that going into
the TV
menu Picture > Advanced Settings > Colour Mode and changing to
Wide did
help a lot.) The only way (I think) to fix this properly is to get the
video
driver to scale the colour levels on output.</span></p>
</div>
</blockquote>
<br>
To help out with your video issues (and anyone else who wants
exact colour corrections), I've made a Open Office spreadsheet which
can calculate the output Colour Lookup Table (CLUT) from nVidia Cards
according to the nVidia X Server Settings dialog, under X Server Color
Correction. While this isn't an exact/correct tabular expansion of the
CLUT, it will give you a quite workable compromise solution.<br>
<br>
Enter the values into the spreadsheet, and it'll generate the table of
output values, so you can get an exact result instead of trying to
guess visually, or see if the range has been expanded properly.<br>
<br>
Download it from here:<br>
<a class="moz-txt-link-freetext" href="http://www.isolutions.co.nz/nVidia_CLUT.ods">http://www.isolutions.co.nz/nVidia_CLUT.ods</a><br>
<br>
At a guess, you could try these values to get an expanded range
approximating what you need. I haven't tried this out, but it appears
to do what you would want. Otherwise, just try out numbers in the
sheet, and adjust until you get the CLUT results you want.<br>
<br>
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<td align="left" height="17" width="86"><b>Brightness</b></td>
<td sdval="-0.025" sdnum="5129;0;0.0000" align="right"
bgcolor="#e6e6e6" width="86">-0.0250</td>
</tr>
<tr>
<td align="left" height="17"><b>Contrast</b></td>
<td sdval="-0.06" sdnum="5129;0;0.0000" align="right"
bgcolor="#e6e6e6">-0.0600</td>
</tr>
<tr>
<td align="left" height="17"><b>Gamma</b></td>
<td sdval="1.1" sdnum="5129;0;0.0000" align="right"
bgcolor="#e6e6e6">1.1000</td>
</tr>
</tbody>
</table>
<br>
Hope it helps compensate for the TV's omissions.<br>
<br>
Regards,<br>
Robert.<br>
<br>
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