[poppler] CMYK TIFF

[Thomas Freitag]

Am 14.09.2012 23:36, schrieb Oncaphillis:
> On 09/14/2012 03:46 PM, Thomas Freitag wrote:
>> Hi Seabstian!
>>
>> Am 13.09.2012 23:56, schrieb Oncaphillis:
>>> Is it possible to generate CMYK Tiff Images using the poppler
>>> utils ?
>>>
>>> I've tried pdftoppm from the latest git pull put it end up somewhere
>>> when in TiffWriter  which complains that "Mode 6 is not supported".
>> As You perhaps already encountered, William created a patch for it (s.
>> https://bugs.freedesktop.org/show_bug.cgi?id=54896).
>
> Yes -- thank you. The patch worked just fine. It should be included
> into the master.
>
>>>
>>> How's about generating bitap images with spot color plains ? Is
>>> that on the road map ?
>> No, at least not on my roadmap. There are only a very few formats and
>> programs which support bitmap images with spot color planes. The only
>> formats for bitmap images I know are TIFF (really seldom used with spot
>> planes and if a TIFF contains spot planes most programs just ignore it
>> or complains about it) and PSD (Photoshop native) which has a better
>> support for it but is even more rarely supported. So it makes no much
>> sense to create a bitmap image with spot planes.
>
> It's actually not about supporting it in a real file format. But 
> generating real spot color bitmaps would give great support for
> raster image processors for printer devices.
In PSOutputDev (used by pdftops) we already support it, at least with 
the level3 option and my DeviceN patch for postscript commited a few 
month ago. The only open point is when a PDF page use transparencies AND 
spot colors, because in the moment it is converted to a CMYK bitmap with 
splash with a poor support for overprint. It would be quite easy to use 
here now the DeviceN mode in splash, too and overprint the resulting 
CMYK bitmap with the spot color planes. I could do that if anybody is 
interested in it and provide some good samples for testing.

Cheers,
Thomas
>
> Thanks for the reply
>
> Sebastian
>
>
> .
>