[argyllcms] Re: Hints to profile my DSLR camera
- From: Pascal de Bruijn <pmjdebruijn@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 4 Jan 2010 22:07:40 +0100
On Mon, Jan 4, 2010 at 9:07 PM, Ben Goren <ben@xxxxxxxxxxxxxxxx> wrote:
> On 2010 Jan 4, at 12:45 PM, Milan Knížek wrote:
>
>> Iliah Borg píše v Po 04. 01. 2010 v 10:11 -0500:
>>
>>> 2. Set white balance from some good reference grey.
>>>
>> This could be required for profiling camera JPEG image. But raw file? I
>> guess almost any raw converter allows for manual white balancing instead
>> of using camera pre-sets or custom camera white balance.
>
> The challenge I've found is in setting the white balance in the RAW
> converter. It's easy enough to do in ACR; just crop the picture to the gray
> target area and adjust the white balance until the histogram is balanced. But
> I prefer the quality (for colorimetric purposes) of the Canon DPP...and
> there's simply no good way to set white balance. The closest is the
> eyedropper, but that samples a single individual pixel -- and do you have any
> idea how much per-pixel color noise there is even at base ISO in the RAW file?
Huh, this confuses me...
Especially since, you need your RAW converter to do absolutely no
color processing at all... just linear raw RGB...
>> The IT8 target offers few grey-scale patches. Would these be more off
>> the actual grey then the white-balancing cards used by photographers? I
>> doubt so.
Actually, you can just looked in the reference file which patches are
supported to be most neutral. For example for my R080505 target,
patches GS6 and GS7 are most neutral, so I use there for spot
white-balance in UFRaw, and this has worked absolutely excellently for
me!
Regards,
Pascal de Bruijn
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