[mythtv-users] colour adjustment

Bruce Markey bjm at lvcm.com
Sat Mar 22 09:26:14 UTC 2003

Ryan A. Carris wrote:
> A sad story about a moron/word of warning/feature request...
> This evening I played with the colour adjustment buttons.  On my system,
> the changes did not occur real time, but were delayed several seconds.
> Therefore since I didn't see the change, I kept pushing the button and
> then pushed other buttons.  Eventually after I decided that the colour
> controls weren't working and stopped pushing buttons, all my changes
> took place at once - and I was left with a pitch black screen with blue
> undertones.
> I tried for about a half hour to correct the colour/contrast/brightness,
> but without the changes taking place in real time and without a slider
> control to see where I was, I just couldn't get the picture to look
> right.  I'm probably just a moron, but I'm telling you I tried and
> couldn't get it. (especially complicating the matter was that the
> settings are per channel based, a good thing, but the channel I was
> watching had the basketball game on.)
> There probably is an easier way, but to solve my problem, I re-ran setup
> to clear the db, and then re-ran mythfilldatabase.  (mythfilldatabase
> --xawchannels was unrecognized for some reason)
> So for those that don't have a colour balance problem, don't touch the
> buttons.  :)
> For those in the know, please let me know of an easier way to fix this,
> if there is one.

Ryan, I'm not exactly sure how to react to this sad tale
other than to start by saying that I certainly understand
your plight. The simple "+" and "-" displayed on the screen
are of little or no use in this situation and this has been
a problem for weeks...

> It would be really great if there was a slider or some indicator of
> change from the baseline (such as +5/-5).  An ability to reset may also
> work.
> -rac

...but this is exactly what I took care of YESTERDAY! 8-).

Check out the current CVS. Each of contrast, brightness and
color have sliders that shows the percentage just like the
volume control.

If you want to get your color back to 50% for all channels,
you could do this:

mysql> update channel set colour=32768;

What I found recently is that, for each of the cards I
tried, white is out of proportion compared to medium tones.
I had thought this might be a gamma problem but lowering
the contrast on the capture card made the images much more

mysql> update channel set contrast=28000;

Hope this helps,

--  bjm

Changes committed by bjm on Thu Mar 20 21:50:26 2003

Modified Files:
    in MC/libs/libmythtv:
         channel.cpp remoteencoder.cpp remoteencoder.h tv_play.cpp
         tv_rec.cpp tv_rec.h
    in MC/programs/mythbackend:
         encoderlink.cpp encoderlink.h mainserver.cpp
Log Message:
Contrast, brightness and color OSD sliders just like the volume control.


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