Igor PDML-StR wrote:
What do you do when the destination colorspace does not have the color
you need?
Let's say you have a photo, you look at the "soft proof" in LR (or in
PS), and you see that the "center-piece" color is way out of the
destination gamut. For example, I have the photo of this red flower
http://42graphy.org/misc/Flower_IR32063.jpg
This photo shares a problem with the other three, the loss of detail in
the color. I had thought that it was just how they were represented on
my phone.
What I think might be happening is not a colorspace issue, but you may
have blown out (clipped) the red channel. Take a look at the RGB histogram.
One thing that you can try doing to see if you can recover detail and
proper color (if the raw file isn't blown out) is simply reducing your
exposure. Both the camera and lightroom seem to adjust exposure based
on the average, or sum, of the three channels, rather than looking at
each channel individually.
In reality, that red is more toward orange. SRGB color space does not
have that color. I see how LR is going to change (you can see the
result), and I can change the color mapping (colorimetric or
perceptual), but it is still far from the "reality" (or what I think the
reality is).
If the red is clipping long before the other channels, which often
happens with the saturated color of flowers, then much less red will
show up in comparison with the others, and will shift the color balance.
eg
if the data is
F0, 40, 10
with red approximately 4 times green and 8 times blue and it is
processed with a 2x multiplier the output will be
FF, 80, 20
So the ratio will be closer to red being only twice green and 4 times blue.
I know that in some cases, especially with soft-proofing for printing,
adjustments of the curve (often brightening or darkening) can help.
Unfortunately, this portion of the gamut seems to be really far away
from the SRGB boundary, so small tweaking of highlights and/or shadows,
or the saturation or luminance of the red channel alone doesn't help.
Is there some trick here that I am missing that could help adjusting the
colors, or, essentially the best I can do is just leave with the
conversion LR (or PS) does?
Previously, I had a similar situation with the carrot-type orange.
Any thoughts and suggestions?
My suggestion is that when you are photographing flowers, either check
your RGB histogram to make sure you don't blow out the raw file, or at
least bracket, so you've got a frame that's been underexposed a bit.
Also, - in this case, this conversion of the red makes the top petals
blend together, and I cannot seem to find the "knob" to enhance the
separation.
If the raw is all clipped in the red, you won't be able to do anything.
If not, clarity might help.
All comments are very welcome!
By the way, if you had shot this with a wide angle macro lens, you could
have effectively had your other photo of a field of flowers as the
background and had an interesting subject in the foreground.
Igor
--
Larry Colen [email protected] (postbox on min4est) http://red4est.com/lrc
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
