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Haroon Sheikh wrote:
DeviceRGB, CMYK, & Gray color spaces are deprecated. You should always
I'm alarmed to hear this. It seems that you will be breaking applications
that need to access device colorspaces for the purposes of calibration
and profiling.
With the deprecation, GenericRGB is the way to go. Also device
dependent colors in PDF documents map to Generic colorspaces also.
So how do I create a test chart in device colorspace to characterize
a printer ?
If one wants to avoid color matching, use the colorspace of the
destination device, if you know it.
This seems to be a unreliable way of handling calibration and profiling.
It's known for instance, that many print drivers do not reliably
return the actual profile they will use for a particular print mode,
therefore matching the colorspace of the destination doesn't seem possible.
It also makes calibration and profiling "fragile". It would be too easy
to get the wrong profile, and result in creating a new invalid profile.
If you create a test chart tagged with the current printer profile for instance,
print it, create a profile and install it, then the saved test chart will
no longer be usable for profiling. It will have to be re-generated with the
new profile.
If a test chart is tagged with as being in device space, then
it will always be valid.
Graeme Gill.
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