[argyllcms] Re: Changing "ink density" in Epson driver prior to profiling
- From: edmund ronald <edmundronald@xxxxxxxxx>
- To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
- Date: Wed, 20 Nov 2013 04:49:54 +0100
One use for the density setting is when you have a non-Epson paper to print
on, and you can then use an existing setting as a base, with a modded
density.
Buckling, blurriness etc are some of the effects if you dump too much ink
on paper; it used to be that Epson's default settings were too "heavy" for
default use, but I think that is in the past.
Edmund
On Wed, Nov 20, 2013 at 1:11 AM, BC Rider <bcrider99@xxxxxxxxxxx> wrote:
>
> > For the QuadTone RIP I made some greyscale targets that show detail loss
> > at more spots along the tone range. Can be used for a normal driver too.
>
> All very interesting.
>
> Last night I printed test charts at 0%, 20% and 40% ink density using the
> Onsight image Alan mentioned. Visually, the 20% had more contrast with
> stronger colors, the 40% even more so. Placed beside the 40% print the
> original 0% print looked washed out.
>
> The 0% and 20% had none of the problems or issues we have been
> discussing, both were perfectly fine. The 40% has some very slight
> mottling in a couple spots of deep black.
>
> Black Dmax went from L* 5.2 down to L* 2.7 and then further to L* 2.6 with
> the 40% version. The grey steps were all visible except in the 40% where
> I couldn't separate the last two steps.
>
> Note: after 24 hours the ink seems to have settled at 4.9 and 2.9 and 2.9
> respectively. Contrary to what X-rite claims with their Munki software,
> 10 minutes is *NOT* sufficient time to allow for inks to stabilize!
>
> This morning I printed again, this time with the test target Ernst was
> kind enough to share. All lines were visible in all patches for all three
> prints (0, 20, 40% ink density). No apparent lost of sharpness or
> resolution.
>
> Eventually I will make profiles for the 0% and 20% ink density and
> compare. But at this point it looks like the +20% is a winner from this
> set. Perhaps a lesser increase will provide most of the benefit. More
> testing is needed.
>
> Since the patches on the left side are becoming more vibrant, I don't
> think the ink changes are due to gamma. One wonders what the media type
> selections really do vis-à-vis the ink density setting. I could find
> nothing describing Epson drivers in this regard.
>
> In any case, based on these test, optimizing the media and ink settings in
> the RGB driver should be the first step in the printer profiling process!
> Unfortunately it seems to be a lot of printing and subjective "eyeballing"
> for RGB drivers. There are a lot of possible combinations of media type
> and ink density. It would be nice to automate and quantify this process
> somehow!
>
>
>
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