[IPP] Question on PWG Raster

[IPP] Question on PWG Raster

Michael Sweet msweet at apple.com
Mon Sep 12 19:52:47 UTC 2011


On Sep 12, 2011, at 10:13 AM, Petrie, Glen wrote:
> Another,
>  
> I believe the sGrayPrimary is used to specify the base color for monochrome printing where the base color is black.  The specification states that the sGrayPrimary replaces the white value.   I believe the sGrayPrimary replaces the Black value; that is monochrome printing goes from a color-to-white versus a color-to-black.
>  
> What is your understanding?  Or have I misunderstood the meaning and use of this value?

Hmm, I'll change the name and semantics to match your understanding (color-to-white), e.g. BlackPrimary and that its use is specific to the Black color space (since that is probably the only useful scenario - print black as this shade of blue...)

>  
> glen
>  
> From: ipp-bounces at pwg.org [mailto:ipp-bounces at pwg.org] On Behalf Of Petrie, Glen
> Sent: Monday, September 12, 2011 10:02 AM
> To: Michael Sweet; ipp at pwg.org
> Subject: RE:RE: [IPP] Question on PWG Raster
>  
> One more question.
>  
> There are two “box sizes”; the Bounding Box and the Image Box.  There is section for the Image Box but not the Bounding Box.  Can you explain the difference between the two boxes.
>  
> Glen
>  
>  
> From: ipp-bounces at pwg.org [mailto:ipp-bounces at pwg.org] On Behalf Of Petrie, Glen
> Sent: Monday, September 12, 2011 9:07 AM
> To: Michael Sweet; ipp at pwg.org
> Subject: RE: [IPP] Question on PWG Raster
>  
> Second question:
>  
> For “CutMedia”, the specification state to use the “WhenEnum”.  All of the WhenEnum are “after” events.  I remember a discussion of “cutting a page before”.  So, are there any other WhenEnum values that should be added.
>  
> Glen
>  
>  
> From: ipp-bounces at pwg.org [mailto:ipp-bounces at pwg.org] On Behalf Of Petrie, Glen
> Sent: Monday, September 12, 2011 8:44 AM
> To: Michael Sweet; ipp at pwg.org
> Subject: [IPP] Question on PWG Raster
>  
> Michael,
>  
> I finally got back to updating my routines for PWG Raster and had a question.
>  
> For ColorSpaceEnum
> Can you confirm that the value 1 == Device RGB was removed for the new version. Can you remind me why?
>  
>  
> Glen
>  
>  
> 
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________________________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair






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