Re: optimal ppi, epson colour space

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On Tue, 20 Jun 2000, Bob Frost wrote:

> Bruce Fraser has offered advice on the optimal ppi to send to Epson inkjets - a problem that has been bugging me for some time. Can't anyone get the exact info out of Epson - they obviously know what the driver does to our files.
> 
> On a second matter, we have read the various views on the best colour space to use for Epson printers - Adobe, Bruce Fraser, or Colourmatch. But has anyone got actual values for the Epson ink colour space ? All the books and articles on colour management show CMYK (swop) triangles in relation to the other spaces, but how does this swop space differ from our Epson space (using OEM inks and papers)?
> 
> bob.frost@cwcom.net


Somewhere on the Epson website is a FAQ that talks about printer ppi.
If I recall, they say that the image resolution, at the final 
printing size, should be 1/3 of the printer resolution.

So is that 1/3 of 720, or 1/3 of 1440?  My guess is the former,
since 1440 is the resolution given by the paper stepping, and 
not the printhead.

There are a lot of variables that affect this decision, though.
If you're printing on watercolor stock, (for example) you don't 
need as high a resolution as you would for printing on glossy papers.
Certain images (eg., line art and text) require very high resolutions.
The optimal resolution for a photo might depend on the degree of 
detail in the photo.

As to color spaces, it's a matter of compromise.  As I understand 
it, Colormatch is a bit smaller than the typical Epson gamut, and
AdobeRGB is a bit bigger.  Again, this is with Epson media -- if 
you're using archival inksets, the gamut is usually smaller.


rafe b.

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