FW: Custom profiling the epson printers
FW: Custom profiling the epson printers
- Subject: FW: Custom profiling the epson printers
- From: Dana Rasmussen <email@hidden>
- Date: Tue, 30 Nov 2004 21:48:10 -0800
This was sent by a customer of mine from Microsoft.
Thoughts on his logic?
--
Dana Rasmussen
Seattle, WA
Subject: Custom profiling the epson printers
I know I've regurgitated lots to you 3 before about epson profiling and
plugged up blacks. I wanted to fire off a quick email before I write up
something more formal. The summary is: If you try and profile with the
epson's driver set to "no color adjustment", you will be fighting a huge
non-linearity in the way the printer prints. It will basically be impossible
to get the shadow details and the color details in the shadows to be dead
on. In order to do this, you would probably need to print out about 20,000
swatches. Even then, I think because of the non-linearity you're trying to
fight, you'll run into rounding errors.
printing with no color adjustment is just feeding raw RGB color and the
print head prints it. However, you can custom profile the epson another way
- by putting the driver into "custom" - "color controls" - "automatic" mode.
In this mode, the driver does not analyze the incoming picture for content,
however, it does pre-adjust the RGB values to compensate for the printer's
non-linearity. Therefore, the custom profiles you make won't be fighting
math rounding, and horrible non-linearities. Most people use "color
controls" with photoshop by setting photoshop to "printer color management".
This sends the color profile to the printer. However, if you use "color
controls" the exact same way as you do with "no color adjustment", that is,
by printing a pattern of swatches with "same as source" turned on in
photoshop, generating a profile, then printing from photoshop with the
profile selected, then this works. Photoshop, when you select an actual
profile, does not send the profile to the printer with the RGB data. Thus,
"color controls" does not do a double-profiling, and just compensates for
the printer's non-linearity curve only. This is a trick, but it works really
well, esp. for black and whites. I can get almost RIP-quality B&W's from the
printer using this trick.
Again: You can still custom profile the epson using "color controls", the
exact same way as if you were using no color adjustment.
This page alludes to this, but doesn't quite spell it out:
http://www.ddisoftware.com/prism/help/driver.htm
Read it closely.
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