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Re: filmscanners: RE: filmscanners: VueScan + flat colors



It is - your screen is made up of phosphors and your printed images of ink.
Their colors are different, so you need to translate.  Bruce Fraser just
posted a very good article consisting of an overview at
http://www.creativepro.com/story/feature/13605.html

>From his article:

The Problem
Computers don't understand color. Fundamentally, they are adding machines
that juggle ones and zeros on demand. When we started using those ones and
zeros to represent color on computers, we did so by creating digital
equivalents of the RGB (red, green, blue) or CMYK (cyan, magenta, yellow,
black) analog signals used to control the various color-capable computer
peripherals, such as scanners, monitors, printers, imagesetters, and
platesetters.

RGB and CYMK are each systems that in essence allow three or four primary
colors to be blended to create a desired color. The strength of each
component signal determines how much of the corresponding primary color is
used. When we adapted RGB and CMYK for representing colors digitally, we
simply used numbers (8-bit numbers, which allowed 256 levels) to represent
the strength of each component value.

So what do we do?

First, we calibrate our monitor so that it shows what it's supposed to show
accurately.

Then we check our printer - if it prints what the screen shows then we're
happy.  May printers do without any further tweaking.  If it doesn't, then
we have to put a filter between the computer and the printer - this is what
is called a "printer profile".  This tells the printer to increase the
magenta, tone down the cyan, or whatever.  There are some stock Epson
profiles for sale but I know nothing of their quality.  There is also
software for sale by Praxisoft, Colorvision and others with which you can
create your own printer profile.  I would go with the software.

Maris

----- Original Message -----
From: "Robert Kehl" <bobkehl@kvernkehl.com>
To: <filmscanners@halftone.co.uk>
Sent: Wednesday, June 27, 2001 12:43 AM
Subject: Re: filmscanners: RE: filmscanners: VueScan + flat colors


| Alan,
|
| Wait a minute!  I thought the whole idea of ICC color management was that
| the various input and output devices could translate from one colorspace
to
| another using ICC profiles.  I guess I don't get it!  Maybe I'd better go
| read up some more on ICC color management.
|
| I wish someone who knows more about software and hardware could tell me
how
| to set up my color management so I could get back to photography.  : )
And
| I thought wet color work was hard!  : )
|
|
| Lost in Color Space,  : 0
|
| Bob Kehl
|
| ----- Original Message -----
| From: Alan Womack <arwbackup@worldnet.att.net>
| To: Majordomo leben.com <Filmscanners@halftone.co.uk>
| Sent: Tuesday, June 26, 2001 8:48 PM
| Subject: re: filmscanners: RE: filmscanners: VueScan + flat colors
|
|
| > Yes, unless you are using a custom profile the native Epson driver does
| indeed expect you to be in sRGB.
| >
| > Alan
| >
| >  >>  AFAIK this is normal.  The gamuts of the colour spaces are
| >  >>  different.  But it leads me to wonder - if some of the
| >  >>  problems I've had with colour matching between the screen
| >  >>  and the output on an Epson printer is that the printer
| >  >>  driver expects the user to be viewing an image in sRGB
| >  >>  not in Adobe RGB?
| >
| >  >>  Rob
| >
| >
| >
| >
| > Epson Inkjet Printer FAQ: http://welcome.to/epson-inkjet
|
|




 




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