Digital BW, The Print

Not surprised you are getting different results sending ONE AFTER THE OTHER
the colour file and then greyscale file.  Important: I am not commenting
here about the paper change or the ink change.  These are additional
variables that you need to isolate. When you send the Adobe RGB file - even
if it is a greyscale image in the colour Adobe RGB workspace - you are
sending entirely different pixel values than when you send the file which
has been converted to your custom dot gain space (why are you using this
anyway?).  If the printer gets different pixel values then it will print a
different colour.

Now the practical issue:  I think your problem is likely a mix of that which
I commented on above AND your ink changeover.  Sounds to me like a nozzle
issue or some sort of ink issue (a bum cart).  Do a full nozzle check and
print the MIS purge pattern a few times.  Before doing this remove all the
cartridges, give each of them a good shake and return them to the printer.

Also see below


> From: Scott Jones <peanutdogs@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Mon, 17 Oct 2005 23:00:15 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: [Digital BW] Re: R2400: RGB vs Greyscale to ABW
> 
> "What colour spaces were the respective files tagged as?"
> --------------------------------------------------------------
> The spaces are either Adobe RGB for an RGB file sent to ABW or a custom
> Dot Gain that I use if a greyscale is sent to ABW.
> 
> Sometimes I have sent the file to the printer with "Let printer
> determine colors" and sometimes per I believe Clayton's suggestion,
> with "no color management",

For Adv B&W there is no difference between these two.


>but since my RGB files are always in this
> Adobe space, I am not sure that aspect makes any difference.

Correct - when you select no colour management no conversion of pixel data
is done and when you ask the printer to do it the Adv B&W driver ignores the
sent profile.