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 <hverkuil@xxxxxxxxx> > > >> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
