ImagePrint
ImagePrint
- Subject: ImagePrint
- From: Nick Wheeler <email@hidden>
- Date: Fri, 24 Jan 2003 14:55:42 -0500
Graham Gill:
>
(but I'm not clear on whether the Colorbyte RIP is doing the black generation,
>
or whether they are driving the Epson in RGB mode). The "normal looking shape
>
with a cone sticking out of it at the black end" is a symptom of using a
>
simplistic black generation algorithm of the type
>
The K generation is handled by the "recipe" part of ImagePrint. ImagePrint
issues draw commands directly to the printheads of the Epson printer. As I
understand Epson Firmware architecture it is possible for 3rd party vendors
to use various levels of Epson "tools" when writing drivers for the Epson
printer.
ColorByte bypasses the "high level" Epson toolset which would have Epson K
gen, ink limiting etc and uses only the "low level" tools which directly
drive the print heads. That is the best explanation I can muster based on
intermittant communications with John Panozzo on the subject.
It was becoming so time consuming for both of us that we both gave up. John
P didn't really want to do a custom tailored version for me of "ImagePrint
for the Complete Idiot".
As I mentioned earlier John did tell me that all incoming data is converted
to Lab, so I would assume that their proprietary stuff happens on the Lab to
printhead leg of the journey. The profiles used by ColorByte are also part
of that outgoing journey. This is why their profiles are not really working
the way others might. As I understand it, in ImagePrint the "profile" is
really a paper specific tweak of the "recipe".
I think (but do not absolutely know) that a simple diagram of the color
journey in ImagePrint might look something like this:
Incoming Data (RGB CMYK) to-> {via embedded profile or specified default in
IP prefs} to-> Lab to-> {via printer profile called for in Edit Color Mgmt
bitmap} to-> {God knows what} to-> {via "recipe" called for in Print Setup}
to-> {necessary number of channels of data to drive the print head}.
That is just a guess, it would be nice to know just exactly where the
printer profile exists in this journey. I do know that all incoming data
gets converted to Lab before it goes through all their proprietary stuff. So
sending cmyk data is sort of a waste.
Nick
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