Color Space
Color space
is the gamut (range) of color we are working with. Our eyes can see
a gamut of color in the visible light spectrum. This is referred to as
"LAB" color, as depicted in the image to the right.
sRGB
Red, Green, Blue - This color space represents the gamut of the transmissive
light spectrum. This area represents the color gamut monitors are
able to reproduce. Notice it is only a small fraction of what our brains
can interpret.
CMYK
Cyan, Magenta, Yellow, Key - This is the reflective color gamut, the
color spectrum that offset printers and inkjets are able to reproduce.
Mixing cyan, magenta, and yellow produces a muddy black. A fourth
pigment, Key, is often black and used to counter this issue.
Notice
in some areas, this spectrum is broader than the transmissive spectrum,
yet in others it is narrower.
aRGB
Adobe RGB (1998) - This is the color gamut introduced by Adobe. It
encompasses a
larger part of LAB color and includes both sRGB and CMYK color gamuts. This eliminates the loss of color information when moving between output
devices.
To retain as much color information possible, it
is best to work in aRGB color space. However, there are a few issues with
this.
Many digicams, notably ones that do not support RAW,
record images in sRGB mode, so the color information is already lost.
It then becomes pointless to convert to aRGB, as it offers no benefit - we
cannot create information from nothing.
Additionally, most web browsers and many print shops support
only sRGB color. Display an image with an aRGB color profile in a web
browser window and it will clip the information it is not able to interpret. As a result, images will appear washed out and contrast-less. If the output
device supports only sRGB, we will need to eventually convert from aRGB to
sRGB.
However, use of aRGB gives us a broader range of
color information to work with and fine tune.
|