[argyllcms] Re: Silly questions about making a printer profile, more questions.
- From: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 07 Mar 2011 15:09:55 -0600
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.
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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