On Apr 28, 2011, at 9:51 AM, Petrie, Glen wrote:
> In the (PWG) Raster, the specification states support for 16-bits per color. TIFF seems to the only image file format supporting it and even the TIFF libraries I could find only support up to 8-bits per color.
libtiff (the most widely-used TIFF library) supports 16-bits per color.
> While I believe the (PWG) Raster specification indicates the range of possible values; will or is there is a specification or compliance requirements on what must be supported? (The same would apply to color spaces.)
I thought I had included this, but couldn't find any requirements in the PWG Raster or IPP Everywhere specs.
My thought was to require sgray-1 and sgray-8 for all printers and srgb-8 for color printers.
> Or is the situation that the printer provides it capabilities, which must be one or more of the of the (PWG) Raster values. Thus, there are no mandatory values just a possible range of supported values.
I think for interoperability we want a minimum set for interoperability (and to address the use cases/design requirements). But most values of color space and bit depth should be optional.
Michael Sweet, Senior Printing System Engineer, PWG Chair
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