[Printing-architecture] Make use of extended color spaces on IPP printers

[Michael Sweet]

Till,

> On May 9, 2021, at 3:26 PM, Till Kamppeter <till.kamppeter at gmail.com> wrote:
> 
> On 09/05/2021 15:41, Michael Sweet wrote:
>>> Now for DeviceRGB (and DeviceGray) I assume that here the data is required in the printer's native color space. Am I right? But can I do true driverless printing with this? Can I download the printer's ICC profiles from the printer? And if yes, by which URL?
>> So printers that support device RGB and device gray also support the "printer-icc-profiles" attribute, which allows you to determine which profile to use for a particular combination of Job Template attributes.  In some cases a single profile is reported that represents the printer's internal working color space.
> 
> Unfortunately, this is not always the case. My HP OfficeJet Pro 8730 has the following attributes
> 
> urf-supported (1setOf keyword) = CP1,MT1-2-8-9-10-11,PQ3-4-5,RS300-600,SRGB24,OB10,W8,DEVW8,DEVRGB24,ADOBERGB24,DM3,FN3,IS1-2,V1.4pwg-raster-document-type-supported (1setOf keyword) = sgray_8,srgb_8,adobe-rgb_8,rgb_8
> 
> but no "printer-icc-profiles" attribute. So for Apple Raster it supports Device Gray and Device RGB and for PWG Raster input it supports at least Device RGB ("rgb_8"?), but there is no information about how to download the appropriate ICC profiles from the printer, meaning that these device color spaces are unusable for true driverless printing. Am I right?

So if you used a color profile generation utility you could print a target image in DeviceRGB to generate an ICC profile that could be used locally.

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Michael Sweet