On Tue, 2010-02-23 at 10:33 -0500, Andy Walls wrote:
> On Tue, 2010-02-23 at 15:41 +0100, Hans Verkuil wrote:
> > > On Tue, 2010-02-23 at 08:53 +0100, Hans Verkuil wrote:
> > >> On Monday 22 February 2010 23:00:32 Devin Heitmueller wrote:
> > >> > On Mon, Feb 22, 2010 at 4:54 PM, Hans Verkuil <hverk...@xs4all.nl>
> > >> wrote:
> > >
> > >> > Of course, if you and Mauro wanted to sign off on the creation of a
> > >> > new non-private user control called V4L2_CID_CHROMA_GAIN, that would
> > >> > also resolve my problem. :-)
> > >>
> > >> Hmm, Mauro is right: the color controls we have now are a bit of a mess.
> > >> Perhaps this is a good moment to try and fix them. Suppose we had no
> > >> color
> > >> controls at all: how would we design them in that case? When we know
> > >> what we
> > >> really need, then we can compare that with what we have and figure out
> > >> what
> > >> we need to do to make things right again.
>
> > Let me rephrase my question: how would you design the user color controls?
>
> > E.g., the controls that are exported in GUIs to the average user.
>
> Look at the knobs on an old TV or look at the menu on more modern
> televisions:
>
> 1. Hue (or Tint) (at least NTSC TVs have this control)
> 2. Brightness
> 3. Saturation
>
> These are the three parameters to which the Human Visual System
> sensitive.
These are the video controls exposed on the standard user menu of my
Sony KDP-51WS655 TV:
Name
TV's Help comment
Control type
My comments
Picture
Picture white level
Slider: 0 to Max
(No comment)
Brightness
Picture black level
Slider: 0 to Max
(No comment)
Color
Color saturation
Slider: 0 to Max
"UV Saturation"
Hue
Green/Red Tones
Slider: R 31 to 0 to G 31
Called "Tint" on older NTSC TV's, it doesn't give complete control over hue
Sharpness
Picture detail
Slider: 0 to Max
"Contrast"
Color Temp
Color Temperature
Enumerated options:
Cool
Bluish-white
like a "daylight" light bulb
Neutral
Neutral
(No comment)
Warm
Reddish-White (NTSC standard)
like a "soft white" light bulb
Dominant color of light in the image. "Temperature" corresponds to the mean
color of light from a blackbody radiator at such a temperature IIRC
ClearEdge VM
Edge enhancement
Enumerated options: High, Medium, Low, Off
(No comment)
Advanced Video controls available via the normal user menu:
Color Axis
Adjust red color axis
Enumerated values:
Default
Emphasize red colors
(No comment)
Monitor
De-emphasize red colors
(No comment)
I have no idea what this control is good for.
Noise Reduction
Reduces repetative random noise
Boolean: on/off
I suspect this may be Luma and Chroma coring. I'm not sure.
The Service mode menu is available via pushing buttons on the remote:
DISPLAY, 5, VOL +, POWER ON
The service control and status options are cryptic and numerous. I
suppose setting these wrong and saving would be akin to writing the
wrong values in the I2C EEPROM on one's video card. (I will note the QM
INFO menu has a fascinating amount of status available.)
Regards,
Andy
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