Re: Mac vs PC gamma difference
Re: Mac vs PC gamma difference
- Subject: Re: Mac vs PC gamma difference
- From: Todd Flashner <email@hidden>
- Date: Thu, 13 Dec 2001 11:49:43 -0500
Steve
Thank you so much for your reply. I hope you'll forgive me for asking a
couple of follow-up questions.
At this point let's just take the variables of monitor and working spaces
etc, out of the equation. We'll assume the operations are run blind (no
monitors attached) through function keys and actions. PS working spaces are
the same, and printers, inks, etc., are identical. Thus the only variable
left is "the assumed input profile/gamma for the Epson driver on each
platform."
How do I ascertain what that is for each system, and if I ascertain that
there is a difference, how is that difference most elegantly overcome so
that profiles and separation curves etc, work equally through both OSs ?
Transfer function, driver setting, adjustment layer, working space
selection, assigned profile, etc.?
Thanks for your help!
Todd Flashner
>
> In the real world, if the two systems have their monitors calibrated to the
>
> same standard, lets say 6500K 2.2g, would printer profiles made on one
>
> system apply perfectly to matched hardware on the other OS, or do different
>
> profiles need to be made for each OS?
>
>
Well, this depends on whether the application (or OS) displaying the
>
image sees the profile and can use the gamma of the monitor to modify
>
the image for correct display. Photoshop does this from 5.x on
>
>
>
>
> FWIW, Here's the nitty gritty of my situation. I've been given RGB ink
>
> separation curves for printing monochromatic quadtone inks through the Epson
>
> driver. They were created by someone using the same inks, printer, and paper
>
> as me, but he's PC, I'm Mac. Using the same curves and driver settings, my
>
> printouts are darker than his. Thus, I'm wondering if this is due to OS
>
> gamma differences. I'm also wondering if this gamma difference is a known
>
> quantity such that there is a predefined curve, transfer function, etc.,
>
> which would make quick work of utilizing the existing curves across systems?
>
>
I don't think it is this simple but it might be related. You need to
>
see what the gamma of you respective working spaces is and then
>
consider the assumed input profile/gamma for the Epson driver on each
>
platform. Both gamma issues, neither of them monitor related.
>
>
>
>
> As this person is scripting such curves for several different printer models
>
> it would be very nice if he did not have to duplicate his efforts for each
>
>
I think you should be able to avoid it..
>
>
Regards,
>
>
Steve