[argyllcms] Re: Could someone help me understand something applying printer profiles.
- From: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 24 Jan 2008 21:01:27 -0600
On Thu, 2008-01-24 at 22:33 +0100, Lars Tore Gustavsen wrote:
> On Jan 24, 2008 7:44 PM, Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > I posted something to the Gimp-user list saying the following about
> > printing images using a printer profile which has been edited using gimp
> > 2.4, which does not yet provide that capability.
> >
>
> Not an answer on your question, but did you print the target from gimp?
Gimp 2.4 packages often come without the gimp-print plugin. But I did
have it for a while when I compiled gimp 2.4.1 from source. I had been
happier with the gutenprint gimp plugin, so I switched instead to that.
I think that, print profiles aside, printing from the Gimp using the
gutenprint plugin is essentially the same as printing from photoprint,
which also uses gutenprint.
I believe that Gimp uses sRGB as its default working space, and that is
what I have been using since it is the simplest choice until I get a
better grip on things.
I haven't been able to figure out what gimp does with files. If a
source file does not have an embedded profile, gimp does not add one
when it saves the image. (I've checked with iccdump -s.) If the source
file does have an embedded sRGB profile, as is the case for my scanned
image files, gimp tells me on input that it is ignoring it since it is
the same as the built-in one. Then, even if I make significant changes
to the image in gimp, when I save the image, iccdump -s shows that same
profile is still embedded in the resulting file---except that in some
cases iccdump -s returns
iccdump: Error - 1, icmHeader_read: ICC V4 not supported!
So I have no idea exactly what gimp is doing.
Be that as it may, I think the following should be essentially the
same:
(1) Editing a file in gimp, saving it, and then printing using
photoprint using sRGB as the source profile and my printer profile as
the destination file.
(2) Taking the edited file, applying cctiff to it with sRGB source and
my printer profile as destingation, reading the result back into gimp
and printing through the gutenprint gimp plugin.
I have no idea what would happen if I were to use the current gimp-print
plugin, and I gather that may change since it is a work in progress.
>
> I "tested" gimp 2.4 some time ago for target printing, when someone
> asked me if they could print a target from gimp. I found out there
> where no way to select "no profile" as assigned profile, even if I
> switched color management off inn the menu. I ended up so suspicious
> that I recommended them photoprint and cinepaint for the target print
> or even gimp before 2.4.
I don't understand what you just said, but I think you may be referring
to what I described above about what gimp does when you save an image.
>
> Lars Tore
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