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Haroon Sheikh wrote:
On May 12, 2005, at 9:20 PM, Graeme Gill wrote:
Haroon Sheikh wrote:
Let me clarify something. At last year's WWDC, we deprecated DeviceXXX
colorspaces. We had plans to introduce new colorspaces for the common
cases that people used DeviceXXX.
- A display colorspace for offscreen bitmap creation. (there is some
simple sample code to do this already though)
- UnCalibratedXXX colorspaces for exactly the case that you want (but
this is a very special need)
It depends on your point of view. For some of us, it is the only thing
of interest :-)
So how do I create a test chart in device colorspace to characterize
a printer ?
Even without the deprecation of DeviceRGB colorspace issue above, this
has not exactly been possible, because PDF documents on Mac OS X will
never write out Device colors and will replace source Device colors
with Generic. There has never been a mechanism available to write out
Device colors in PDF documents. Because PDF is the spool file format on
OS X, it's the only way to get your data to the printer. The
UnCalibratedXXX colorspaces were meant to allow developers to generate
PDFs with DeviceXXX colors. Until they are available, the
recommendation was to tag your data with the colorspace of the
destination device.
OK. That sounds like a reasonable approach. Of course the misuse of
DeviceXXX has been going on since PostScript was invented,
and UnCalibratedXXX sounds like another round in the shell game
of hiding Device colorspace, and then adding another path to
get at the _real_ device colorspace.
If a test chart is tagged with as being in device space, then
it will always be valid.
Understood, and the new UnCalibratedXXX were meant to address some of
this. Tagging with the destination space is still the interim solution.
That sounds like it will work.
Graeme Gill.
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