Re: Outdoor/daylight camera profile
Re: Outdoor/daylight camera profile
- Subject: Re: Outdoor/daylight camera profile
- From: matthew barlow <email@hidden>
- Date: Tue, 23 May 2006 22:11:33 +0100
- Thread-topic: Outdoor/daylight camera profile
Title: Re: Outdoor/daylight camera profile
Michael, I am coming at this from a purely representational photographic view, rather than technical, viewpoint.
Daylight is so variable and changes so quickly that I would consider it virtually impossible to get a profile that has has any lasting meaning.
Rather than trying to neutralize the daylight surely in photographic representation we are trying to capture an essence of the scene, in the old days we would choose our film type to match the job requirements and then would use wratten filters to get a pleasing transparency.
I use Phase One most of the time, we always capture a colour target, we always capture a lens calibration and I will usually use a colour temperature meter to check the light. But where do we put the target? it will be affected by the environment – great care must be taken – consider taking a grey reading in a sunny summer forest, the light would probably be green due to the leaves, if you neutralize that-the scene will not look correct/pleasing.
It is interesting that with Capture One if you use the gray balance tool and then read of the scale as to what the colour temperature was this is usually cooler than my Minolta Colour Meter tells me it is, but this is rather like putting a Wratten cc81a onto Kodak EPP to get a more pleasing result.
In my work calibration is a wonderful thing but visual perception is the overiding factor; now copying artwork in a studio is a completely different matter.
If you want to make profiles for artwork you should make the targets with the same inks/dyes / paints, this is fine in theory but if ,like me you have an artist friend that will make up any colours with anything to hand ( tea, red onion juice, crushed rocks et al) then you would have a real problem creating meaningful targets.
Regards
Matthew Barlow
Michael Fox Photography News Account wrote on 22/5/06 8:30 pm
I’m interested in making a camera profile -- in particular, a daylight profile for a digital back -- and I am looking for pointers.
The existing Outdoor Daylight profile from Phase One lacks highlight definition, saturation in light colors and have a hue shift in the blues toward cyan. I made a “quickie” profile which did a much better job. By “quickie” I mean I stuck the target in the sunlight and took a shot without worrying about such things as color reflection from the tan table it was sitting on, specular highlights, etc. Even so, when comparing the colorchecker numbers in the image using my quickie profile vs. the theoretical/average numbers provided by Bruce Lindbloom and others, I got a much better match than with the supplied profile. When applying to various images, the result was also better, with much better highlight detail, better saturation of light colors (like rainbows) and no hue shift in blue values.
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