Hastings, Tom N wrote:
> I've down loaded a first draft for an IEEE-ISTO IPP Color and Imaging
> Attributes standard to the PWG FTP site. Most of the attributes
> control color and imaging that is prevalent in the industry following
> industry standards. The files are available at:
>
> ftp://ftp.pwg.org/pub/pwg/ipp/new_COLOR/pwg5100.8-D01-021018.pdf
> ftp://ftp.pwg.org/pub/pwg/ipp/new_COLOR/pwg5100.8-D01-021018.doc
OK, I've only had a chance to skim this draft, but some thoughts:
1. There is no "adjust-hue (integer(-180:180))" attribute;
this is something that CUPS has provided since day one,
and it has some interesting (and sometimes even practical :)
applications when printing images.
2. There are no "image-subsampling" attributes, only the
"anti-aliasing" attributes. Most images are subsampled
when printed (since the printer resolution is typically
!= the image resolution), and it can be important to
specify the default subsampling in documents. I would
suggest the following pre-defined keyword values:
"none" = nearest-neighbor sampling
"linear" = linear interpolation
"cubic" = cubic interpolation
Other algorithms are also possible (some include sharpening
effects, etc.), but these three cover the common algorithms.
3. The current conformance requirements are pretty vague.
It might be useful to summarize the basic conformance
requirements of each group of attributes in section 6,
or at the begining of each group, so that implementers
can know immediately which attributes are REQUIRED and
which are OPTIONAL. At the same time, this will allow
clients to determine quickly if the destination device
supports the group of attributes it needs.
(I guess I'm saying we need to define that some groups
of attributes are connected, and if you implement one
you have to implement them all for consistency)
--
______________________________________________________________________
Michael Sweet, Easy Software Products mike at easysw.com
Printing Software for UNIX http://www.easysw.com