[argyllcms] Re: Hints to profile my DSLR camera
- From: "Iliah Borg" <ib@xxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 04 Jan 2010 10:11:51 -0500
> Ok now that I'll own soon my target to profile the DSLR
camera I need more hints to shoot the target.
If you have a studio you can use Solux 4700K lamps with
black-painted backs or HMI lights (Mole-Richardson are a
good source). Broad-spectrum fluorescent lamps (Normlicht
or JTI branded) are a solid choice too. If you are on a
budget any halogen lamps with stabilized power supply and
gelled to reach about 5000K are OK.
1. Use a lens as simple as possible, a 50mm prime is ideal.
You will need a separate profile for your polarizing
filter. A good deep hood on the lens is a must. Any
reflections or flare will make for a poor profile.
2. Set white balance from some good reference grey.
3. Shoot at f/5.6 or about that, watch that no vignetting
occurs (do not fill the frame with the target)
4. Shoot slightly out of focus.
5. On the target shot, check that grey frame is uniform, no
more than +/- 2 RGB.
6. Expose so that the whitest patch is 244..240; 242 is
ideal. Take several shots bracketing with shutter speed to
ensure good results.
--
Best regards,
Iliah Borg
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