[argyllcms] Re: Silly questions about making a printer profile, more questions.
- From: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 07 Mar 2011 15:36:05 -0600
On Mon, 2011-03-07 at 15:09 -0600, Leonard Evens wrote:
> On Sat, 2011-03-05 at 23:58 +0000, Derek Wells wrote:
> > Hi Leonard,
> > Depending on the printer you're attempting to profile, you only need to make
> > one target with targen.
> > Use targen option -d2 if your printer is presented as an RGB device by its
> > driver, and option -d4 if it's presented as a CMYK device.
> > Since you mention Epson, it's most likely that you'd need to use -d2.
>
Never mind!
I see what the problem is. I have the Fedora 14 Argyllcms package
installed. I decided to work with it although it screws some things up,
and most of you disapprove of it. In principle, it may eventually
better integrate Argylcms color management with gnome. I need to stick
with it at present because I am using the gnome color management method
to ensure I have my display calibration installed in X when I login. (I
could of course change that, and maybe I will!)
But I've now downloaded the official Linux executables and put them
in /us r/local. They show d2 as meaning Print RGB. I will use the
new executables to make my printer profile. I guess it is going to be
a pain keeping the two sets of executables apart, but I think I can
manage it for a while at least. I hope the dispute will be worked out
(presumably at the gnome package end) in the near future!
> According to my documentation for targen, d2 is supposed to indicate
> Print CMY
>
> But my Epson 3880 is an inkjet and as such is supposed to be treated as
> an RGB device.
>
> But everyone seems to agree I should use d2 instead of d3 which
> indicates Video RGB.
>
> What am I misunderstanding?
>
> > The number of patches you'll need to print (and measure) to get a "good"
> > profile depends on your own quality requirements and how "well behaved" and
> > repeatable the printer is with the settings you intend to operate it with.
> > (For most desktop printers, that means picking, then setting and recording
> > the driver's media type, print quality, and colour management options to be
> > used when printing the profiling targets so that the driver and printer can
> > be set up in the same way when using the profile.)
> > Most of the time, the only way to find out how well behaved the printer is
> > with any given set of settings is to print the targets, measure them, and
> > look at the profile and prints produced using the profile.
> > >From personal experience, I'd suggest starting with around 1000 patches.
> > With regard to paper sizes, differences in the paper size used to print the
> > profiling targets and the final print shouldn't have any effect, so long as
> > the paper used to print the targets is the same as the paper used to make
> > the final prints. (In the ideal world, both paper sizes would come from the
> > same manufacturing batch, but that's frequently not the case).
> > Where paper sizes will make a difference is in the scanning of the targets;
> > the ruler supplied with the i1 pro has a fixed size, which sets the width of
> > the targets.
> > You could always produce a suitably sized target file:
> > targen -d2 -f1000 rgb-printer
> > printtarg -v4 -ii1 -t -pa2 rgb-printer
> > this will produce a profiling target with 1000 patches spread over one A2
> > sized page; with a little application, that should be printable on one 16 x
> > 20 sheet . (The target will be in tiff format: omit the -t from printtarg if
> > you need a postscript version.)
> > After printing, remember to give the target time to dry and cure; I'd
> > suggest leaving it for a day.
> > I hope this is helpful.
> >
> > Derek
> >
> > -----Original Message-----
> > From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
> > On Behalf Of Leonard Evens
> > Sent: 05 March 2011 20:13
> > To: argyllcms@xxxxxxxxxxxxx
> > Subject: [argyllcms] Re: Silly questions about making a printer profile,
> > more questions.
> >
> > On Sat, 2011-03-05 at 11:59 -0600, Leonard Evens wrote:
> > > I have done this before, but it was a while back.
> > >
> > > The instructions for making a printer profile start off with two
> > > examples using targen
> > >
> > > targen -v -d3 -f1053 PrinterA
> > > targen -v -d4 -l260 -f1053 PrinterB
> > >
> > > Looking at what I did the last time, I did run both of them (withy
> > > parameters I chose).
> > >
> > > Is it correct that I only need to do one, or are both needed for later
> > > steps? Looking ahead at the instructions, I don't see anything
> > > suggesting both are needed, but I am not sure.
> > >
> > > Also, I have an example of a profile provided by Epson for the printer
> > > and paper I am going to use. Is there some way to tell from looking at
> > > the profile how many samples I need to ask for in targen? Is it going
> > > to be the same as the number of entries in a LUT in the Epson profile?
> >
> > Targen gives recommendations for the number of patches dependent on the
> > paper size and includes a multiplier. Can I assume that the
> > 4 x Letter recommendation would be a appropriate for a profile to use
> > when making 16 x 20 prints? Do I then use 16 x 20 (actually 17 x 22)
> > sheets to make the profile? I am using an Eye-One_Pro which allows me
> > to scan strips. I don't remember how it worked, but I don't want to use
> > any more paper than I have to.
> >
> > How much do I lose by using a profile made with letter size paper with
> > large prints?
> >
>
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