Image Processing Reference
In-Depth Information
spool\drivers\color\ . In the System32 folder, I found subfolders ( Adobe and
Color ) where color profiles are stored.
You can find information on the topic of color management on Udi
Fuchs's website: There you can
find download information on color profiles for cameras and other devices.
You can find the download link for the Adobe RGB color profile on Adobe's
In UFRaw's program window, the first selection, the drop-down menu
above ( Input ICC profile), ), refers to the input device, in this case, that of your
camera. If there isn't a color profile available from your camera, you can fall
back on the sRGB color profile. Details on downloading various manufacturers'
own color profiles can be found on Udi Fuchs's website.
Alternatively, you can choose Color matrix from the menu. When selected,
this setting increases the color intensity, but some colors tend to become
rather over- or underexposed.
The Ouput ICC profile , the second color profile that can be chosen, refers
to the output, the result being your printout or your photo print. The default
setting is sRGB. For a printout, I recommend Adobe RGB, which is optimized
for the PC printer, having an extended color rendition compared to sRGB. It is
better but not a must.
The third color profile, the Display ICC profile , is the actual color profile
of your monitor. However, the rendition with a calibrated monitor can be
different than the sRGB profile. That's why there is an option to choose the
system default.
In the drop-down menus Output intent and Display intent, the selection
Perceptual corresponds with the rendition on the screen. The other options
are relevant for the printing process. From my own experience, the Perceptual
option delivers very good results a printout from a PC or color prints from
the lab.
Further settings on this tab, Color management, affect the appearance of
the image more than the application of just one color profile alone.
I have already chosen the color profile for the input device ( Input ICC
profile) ) in the Color matrix menu, thereby increasing the color intensity. The
Gamma slider controls the brightness of the midtones in the image. Lowering
the value brightens the picture, while raising the value darkens it. I corrected
the midtones over the Base curve setting, so I keep the default settings. The
Linearity slider controls the contrast of the image. Higher values raise the
contrast. For this example, I reduced the contrast slightly.
Moving the Saturation slider to the right increases the color saturation of your
image while preserving both hue and brightness. Moving the slider to the left
de-saturates the image, reducing the colors until you have a pure black-and-
white image.
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