RE: LS-2000 help

[Ernst Dinkla <ernst@xxxxxxxxxxxxxxx>]

In <URL:news:lokaal.panorama> on Tue 08 Aug, Sokolowski, Ed wrote:
> Ernst,
> 
> I was not aware of that.... I am not sure why Epson would convert CMYK to
> RGB to pring on CMYK sounds Like they are trying to correct the problem I
> was talking about. Users printing RGB to CMYK printers. Our Epson 5000's and
> 7000's are balenced for the press so that the output from either machine
> MATCHES the output from the press. All files are CMYK.

If an Epson isn't used for prepress proofing, other factors are more
important:
  
* there are several reasons to stay as long as possible in an RGB
colourspace, for example for editing and for use in other media
or other processes: lambda, hexachrome. The graphic industry is
adapting that approach as well.
* if a wider colourspace than Colormatch RGB is used than the Epson
CMYK dye inks can deliver a wider gamut than what is possible in offset
CMYK.
* it could well be that the excellent dithering of the normal Epson
driver is only possible with the internal RGB to CMYK conversion.
An equal dithering is hard to find in RIPs, though PressReady is almost
getting there. The Pixelis RIP actually uses the Epson dithering. The
good dithering of the Epson driver compromises on colourcontrol though,
something that is also the found in the Pixelis RIP.

> The press that we send the final to RQUIRES CMYK Wouldnt it be better
> workflow to make only one document that represents the final output insted
> of one for proofing and one for press..........??? 

Maybe, the last would be better if you are using the Epsons as a proof
printer. That means buying a RIP to drive the Epson. Wasatch, BEST, Onyx
etc will drive the 5000 and 7000 in CMYK style. And for the Epson models
below the 5000 you could use PressReady (though rumour has it that Adobe
ceases development on PR, one year after its launch!). You will need
CMYK ICC profiles in your RIP for the Epson and different CMYK ICC
profiles in the RIP for the imagesetter.

If you use the normal Epson driver for prepress work you need RGB ICC
profiles and for the imagesetter RIP CMYK ICC profiles. It becomes more
complex. That and less colour control (especially on black) in the Epson
driver makes it hard to get a decent proof.

It doesn't mean however that the image has to be CMYK. There are
even RIPs that can apply the right profiles to both an RGB and a CMYK
image that are on the same page in the file. In general the trend is to
stay in RGB and let the RIP do the conversion with the appropriate
profiles for proof printer and image setter.

Ernst
-- 
Ernst Dinkla  Serigrafie,Zeefdruk            The point will never be metric