On Saturday, June 28, 2003, at 12:18 PM, LAURIE SOLOMON wrote:
> B) With respect to the workflow, most people convert the assigned color
> profile embedded in the image file that one has imported into
> Photoshop into
> a working color space like Adobe RGB 1998, Apple RGB, Bruce RGB, etc.
> because those working spaces have wider gamuts than do the typical
> device
> gnerated profiles or sRGB which many scanners and digital cameras
> default
> to. After you do your corrections and manipulations of the image and
> are
> ready to send it to the printer, you have two choices:
>
The other & primary reason you select a working colorspace like Adobe
RGB (1998), sRGB, ColorMatch or BruceRGB is that they are neutral at
any point on a grayscale: R=G=B . Device specific color spaces for
things like monitors, scanners, printers -- no matter how you derive
them are just that: device specific and except by extremely rare fluke,
are not neutral. Let me repeat that that :
DEVICE SPECIFIC COLORSPACES ARE NOT NEUTRAL!
This is true, almost by definition. Individual monitors, scanners and
cameras and printer+ink+paper combinations have their own
characteristics. The purpose of accurately calibrating and profiling
these devices is to determine where they are not neutral and then to
shift the basic set of data going to that device so that what appears
on the monitor screen or on the print is an accurate representation of
the data. Essentially an accurate profile negates the quirks of the
individual device.The original data set is not touched unlessyou do so
deliberately.
This is one reason why it is not a good idea to choose a monitor
determined colorspace -- whether you use a "puck & software' or a
strictly software app like Adobe Gamma or littlecms, etc. as your
working space.
Ellis Vener
Atlanta, GA
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