[scribus] How to use color management?

[Hal V. Engel]

On Sunday 31 August 2008 12:14:28 pm dwain wrote:
> On 8/31/08, Hal V. Engel <hvengel at astound.net> wrote:
> >  Because of this you wil likely discover other aspects of
> >  your work flow that can be improved (IE. the results from my ABC scanner
> > do not look correct on my calibrated and profiled monitor maybe I should
> > create a custom profile for it?  My room lighting is too bright and too
> > warm...).
>
> i will need to calibrate my scanner 

Actually you need to profile (characterize) your scanner.  All you need is an 
IT8 target and some software.  I recommend targets those from Wolf Faust.  Low 
cost and high quality and Wolf is very accessable.  For software either LProf 
or ArgyllCMS will do the job.  LProf is more user friendly for this than 
ArgyllCMS.

> and my two printers.  at present,
> i have to work in front of a window with the blinds down.  i usually
> don't do much work in the daytime anyway, so this is no big deal.  at
> nigh, i work by a 60 watt light bulb in a 12" reflector bounced off
> the ceiling (i come from a photographic background).  the room is
> pretty dim.  the walls however are white, as i live in an apartment,
> so no gray paint on the walls for now.  

The gray room thing is probably a little over the top but I wrote about it to 
make the point that there are lots of things that make a difference that most 
people would not have considered to be part of color management.  The most 
important thing is to make sure that the room is fairly neutral and to remove 
non-neutral objects from your working field of view.  White walls are OK 
(particually is they are really white and not some off white) but it will make 
it more difficult to keep the illumination level as low as it needs to be.

> the 60 watt bulb is a little
> less than 2800k in temp.

Much too warm and this will cause issues with evaluating your prints and also 
with judging things when working on a monitor.  Your goal is to get the light 
in the work area close to 5,000K and low enough that the monitor becomes the 
dominate source of light in the work area.

>
> >  Since I now work on software that uses these devices I have a small
> > collection of measurement devices that I use for testing and I use a few
> > of these to handle my own calibration and profiling tasks.
>
> speaking of measuring devices, and knowing that i have two printers,
> soon to be three, what device and reflective calibrator would you
> recommend that doesn't cost an arm and a leg and where would i
> purchase the device?

EyeOne Pro is probably your best option.  These are fairly expensive but will 
do everything you need including monitors.

>
> >  Use D50 bulbs with high CRI ratings (at
> >  least 85 but the closer to 100 the better - ISO calls for 90 or higher).
>
> again, where to buy?

These can be difficult to find locally.  I am using some that I got at Home 
Depot.  The second web link (see below) I gave you has a section on this and 
lists many of the options and has links to the vendors.

>
> >  There is actually an ISO standard for the above (including lighting) if
> > you want to look it up and there are web pages that cover it in some
> > detail and that include specific paint recommendations for those that
> > don't have a spectrophotometer; please see
> > http://www.creativepro.com/article/the-darkroom- makes-a-comeback and
> > http://www.creativepro.com/article/the-darkroom-makes-a- comeback-part-2-
> > .
>
> very good information.  maybe i can unravel the mystery of color
> management and get everything calibrated and work with more
> confidence.
>
>
> i am eager to hear what you have to say about a measuring device and
> reflective calibrator and where i can get these items.  thanks for
> your patience and thanks for making things more clear about color
> management and profiles and such.
>
> cheers,
> dwain

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