Hi Sylwester, Sylwester Nawrocki wrote: > Hi Sakari, > > On 05/16/2012 08:57 AM, Sakari Ailus wrote: > ... >>>>> + >>>>> + <row id="v4l2-auto-n-preset-white-balance"> >>>>> + <entry spanname="id"><constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant> </entry> >>>>> + <entry>enum v4l2_auto_n_preset_white_balance</entry> >>>>> + </row><row><entry spanname="descr">Sets white balance to automatic, >>>>> +manual or a preset. The presets determine color temperature of the light as >>>>> +a hint to the camera for white balance adjustments resulting in most accurate >>>>> +color representation. The following white balance presets are listed in order >>>>> +of increasing color temperature.</entry> >>>>> + </row> >>>>> + <row> >>>>> + <entrytbl spanname="descr" cols="2"> >>>>> + <tbody valign="top"> >>>>> + <row> >>>>> + <entry><constant>V4L2_WHITE_BALANCE_MANUAL</constant> </entry> >>>>> + <entry>Manual white balance.</entry> >>>>> + </row> >>>>> + <row> >>>>> + <entry><constant>V4L2_WHITE_BALANCE_AUTO</constant> </entry> >>>>> + <entry>Automatic white balance adjustments.</entry> >>>>> + </row> >>>>> + <row> >>>>> + <entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant> </entry> >>>>> + <entry>White balance setting for incandescent (tungsten) lighting. >>>>> +It generally cools down the colors and corresponds approximately to 2500...3500 K >>>>> +color temperature range.</entry> >>>>> + </row> >>>>> + <row> >>>>> + <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant> </entry> >>>>> + <entry>White balance preset for fluorescent lighting. >>>>> +It corresponds approximately to 4000...5000 K color temperature.</entry> >>>>> + </row> >>>>> + <row> >>>>> + <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant> </entry> >>>>> + <entry>With this setting the camera will compensate for >>>>> +fluorescent H lighting.</entry> >>>>> + </row> >>>> >>>> I don't remember for quite sure if I replied to this already... what's the >>>> diff between the above two? >>> >>> No, you didn't, otherwise I would certainly remember that ;) >>> >>> V4L2_WHITE_BALANCE_FLUORESCENT_H is for newer, daylight calibrated fluorescent >>> lamps. So this preset will generally cool down the colours less than > ^^^^^^^^^ > Sorry, I put it wrong. It should have been "warm up", since "cooling down" > the colours happens only for V4L2_WHITE_BALANCE_INCANDESCENT, other presets > just generally warm up colours, with various degree. > >>> V4L2_WHITE_BALANCE_FLUORESCENT. I was even thinking about a separate control >>> for V4L2_WHITE_BALANCE_FLUORESCENT, since some ISPs have several presets for >>> fluorescent lighting. I dropped that idea finally though. >> >> I don't know about the daylight calibrated ones, but the older ones often >> tend to give colder light. Nevertheless, I think it'd be good to mention >> this in the documentation. I couldn't have guessed it. :) > > Do you think something like this would be OK: > > + <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant> </entry> > + <entry>Variant of <constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant> > + for fluorescent lamp lighting with spectral power distribution more similar > + to daylight.</entry> > + </row> > > ? Looks good to me! Cheers, -- Sakari Ailus sakari.ailus@xxxxxx -- 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
