[Radiance-general] printing floating point images

[Jack de Valpine]

Hi Lars,

Yes, as I understand these photographic printers (eg direct to photo 
paper), such as the Lambda and Pegasus, print RGB not CMYK. The nice 
thing about this is there is no mucking about with conversion from one 
colorspace to the other. They use red, green and blue lasers to expose 
the paper. Do a web search for Durst Lambda to learn more or check out:

http://www.durst-online.com/uk/produkte.asp?pid=2&hid=

I think that the kodak product may be different, perhaps some kind of 
LED to expose the paper.

-Jack

Lars Grobe wrote:

>Hi!
>
>  
>
>>In general you need to print to a print device that goes direct rgb.
>>    
>>
>
>??? You mean a driver that can do the rgb to cmyk translation, without the
>need to do that in an application? Just wondering, I never heard about
>rgb-printers, do you mean transfering to a film (which is like foto and as
>such rgb)?
>
>Regarding printers, it is a big help to use printers that don't offer just
>cmyk, but also the light colors (there are 6 and 8 color printers), as this
>avoids raster problems in bright regions of your renderings.
>
>Calibration... afaik the radiance output is close to srgb, so if you have an
>output profile for your printer (icc), this should be easy. There is also
>macbethcal which could be used to make a simple output calibration, however,
>I never used it (I tried once).
>
>I can't imagine that the bit per channel question is really relevant (for
>inkjet printing), because the limitations of paper and the raster technique
>used to mix the colors.
>
>I will have to do some large-format printouts of radiance pictures (which
>have to be rendered first ;-) for an exhibition next march, as such I am
>interested in the topic.
>
>CU Lars.
>
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>
>  
>

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#	John E. de Valpine
#	president
#
#	visarc incorporated
#	http://www.visarc.com
#
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