Re: UGRA/UDACT-conforming displays [was: i1Display x i1Pro]
Re: UGRA/UDACT-conforming displays [was: i1Display x i1Pro]
- Subject: Re: UGRA/UDACT-conforming displays [was: i1Display x i1Pro]
- From: Thomas Holm/pixl <email@hidden>
- Date: Wed, 1 Apr 2009 13:56:43 +0200
If you have a high bit display why not put it to an emperical test (I
did on 2 different monitors).
Make 3 profiles one at L*, one at Gamma 2.2 and one at G 1.8, leave
luminosity and whitepoint to be the same for all profiles. The only
change between these profiles is, well the profiles, and the gradation
made in the high-bit lut in the display. This will allow you to change
profiles without affecting the VCGT.
Open you editor of choice, open color settings, turn dither off.
Make an RGB document, ideally the width should be something
multipliable with 256, but not exceeding your monitor resolution width
(say 1536 px which will give you 6 pixels of each level), and make two
duplicates. Assign Adobe RGB, Apple RGB and your L* space of choice.
Then make a black to white gradation in each document - be very picky
about placement of the endpoints and angle!
Position all three documents so they are all visible, and load the
varying monitor profiles and see if it makes a difference.
My experience tells me that you will see various degree of banding
especially, in the two windows with a tone curve/gamma setting
workspace which is different from your monitor calibration.
Maybe I'm just too picky. And we can agree that few images are as
critical as a non dithered gradient. However some images and graphics
are pretty close. No, it may not be practical, and it would indeed be
nice if you could ignore the issue entirely. I just don't feel I can.
But do give it a try and see what you find on your own equipment, and
then decide weather it's worth sacrificing a bit of practicality for
quality.
;-)
Best Regards
Thomas Holm / Pixl Aps
- Colour Management Consultant
- Seminars speaker and tutor on CM and Digital Imaging etc.
- Ugra Certified Expert/Consultant: Process Standard Offset
- Apple Solutions Expert
- Member, ColorManagementGroup.com
- www.pixl.dk ยท email@hidden
--
On 01/04/2009, at 06.35, Marco Ugolini wrote:
In a message dated 3/31/09 5:38 AM, Eric Nunn wrote:
Is this new advice? I have don't recall ever reading anything about
correlating monitor calibration to preferred working spaces before.
Me neither.
To make an example, I had never heard (or read) such a warning from
Bruce
Fraser.
Truth is, this is the first time I'm hearing such a thing from anyone.
To me, this doesn't sound right.
Marco Ugolini
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