Re: ICC and Colorspaces
Re: ICC and Colorspaces
- Subject: Re: ICC and Colorspaces
- From: "Russell Proulx" <email@hidden>
- Date: Fri, 8 Dec 2000 15:05:19 -0500
- Priority: normal
On 8 Dec 2000, at 8:48, email@hidden wrote:
>
the workingspace is the source space of the conversion; the
>
monitor profile is used for nothing except viewing.. If you do a
>
convert to profile you have changed the numbers to be accurate in a
>
differently defined workingspace, where as simply assigning a
>
profile does not correct the numbers for the new space, and so
>
should only be used in special situations.
To see if I understand correctly let's just talk about one of the RGB colors.
The 255 level readings of red that are in the info pallet refer to 255 equally
spaced parts of a red spectrum. The nature of this red spectrum (how
much is included or excluded) will vary according to the working space
we're in and that's why simply using the same numbers in another
colorspace (via assign profile) will produce nonsense. Also if I open a file
that was produced in another colorspace and I choose not to convert to
my working space I get the same garbage. Ok so far?
Where I'm confused is when I convert to other colorspaces I would expect
the image on screen to change (less reds to choose from...more reds to
choose from...wide vs narrow colorspace etc..). But it doesn't. And when I
convert to the printer profile after converting to another RGB profile I see
no difference onscreen. Does this suggest that the colors of the test
image onscreen already fit into most (if not all) user-selectable
colorspaces and that's why they display the same when converted to other
color spaces?
On another point that's a bit unrelated, would it be silly to choose a printer
profile as the RGB colorspace? I ask this only because I've seen
someone set their system up this way (with Photoshop 5.5) and I thought
this was wrong.
As mentioned in an earlier post the results I've had with the Pictro and the
Frontier have been very promising. Next week I'll repeat them to test the
devices stability.
Russell Proulx
Photographer
Montreal, CANADA