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Re: filmscanners: Colour fix problem
Title: Re: filmscanners: Colour fix
problem
The greenmig photo can be color corrected and fixed - fairly
easily. (corrected greenmig sent direct to poster, with PS
adjustments shown on graphics of each modification) He uses PSP,
which I have no knowledge about, so some adjustments may not be
easily accomplished, such as Selective Color, which was used to take
the yellow out of the white floor.
Neither the film captured (greenmig) nor the digimig
photos exhibit broad gamut as shown below in two 9kb graphics.
Both are 2D L.a.b. graphics, referencing ColorMatchRGB in the
green outline with the color gamut data of the picture (extracted
from the photo in ColorThink) shown as red. The film photo actually
has a broader gamut than the digital picture. The scene itself was
not a particularly saturated color situation. See comparison with
ColorMatchRGB gamut.
Original greenmig:
The digimig photo:
 on 6/9/01 1:26 PM, Ian Boag at
ianboag@partslink.co.nz wrote:
> I have attached two heavily crunched down photos. I am looking
for help
> here on how to fix one of them. Last year I went to the RAF
museum at
> Hendon. I took pictures on regular Fuji 200 film using a Konica
Revio APS
> camera. I also had an Agfa 1680 digicam. The museum has some
kind of arc
> lighting which came out all green in the prints. It scans like
that too.
> See greenmig.jpg (the pic is a Mig-15). The scan was done on a
Kodak
> FD-300. Comes out much the same whether I use their auto fix on
scanning or
> not. The digicam took a picture that looks about right (see
digimig.jpg).
> Generally the FD-300 does a job that I am happy with.
>
> My problem is how to fix the green scans. If I just throw in
magenta
> correction I eventually get the plane looking right, but the
roof and
> surroundings go bad. The situation is complicated of course by
the fact
> that the camera suffers from vignetting at full aperture on max
wide.
>
The problem is that the film captures what data fits in it's gamut at
the
time of the shot, and information is just not there for you to adjust
the
color. The digicam is probably doing a
white balance and capturing a
different gamut.
Jim Snyder
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