On Wed, Apr 3, 2013 at 9:17 AM, Jose Carlos Garcia Sogo <[email protected]>wrote:
> On Wed, Apr 3, 2013 at 9:02 AM, Richard Levitte <[email protected]>wrote:
>
>> In my personal opinion, the "in" temperature should be set to whatever
>> the camera detected (usually available through the EXIF data), or
>> something calculated internally (some tell me this is what dcraw and
>> ufraw do). Initially, the "out" temperature should be the same, and
>> can then be adjusted to make an image warmer or cooler.
>>
>> As far as I understand, programs like ufraw only have a slider for the
>> "out" temperature, and only hold the "in" temperature internally as a
>> reference point for adjustments. This is what I expect the one-slider
>> approach the Pascal mentioned would do.
>>
>
> The one slider approach is already implemented in one branch, waiting for
> 1.2 to be released.
>
Yeah, string freeze... So the earlier version with this change would like
be 1.2.1, assuming we can all agree on making this change in the first
place.
> The slider will show the camera detected temperature, from which the user
> will be able to adjust the white balance it desires in an absolute manner.
>
Sortof...
Technically there is no camera-detected temperature in the EXIF (for most
camera models). Only the R-G-B multipliers (anything else is just software
derived). We have to deduce an approximate temperature+tint from that. And
this is camera specific because of the CFA.
I believe UFRaw uses some transform through the camera specific color
matrix to make it less camera dependent. But even then it should be
regarded as a ballpark figure.
Regardless, there is still some discussion to be had amonst the devs before
all this is final.
Regards,
Pascal de Bruijn
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