Graphicscard problems with Cinemadisplay?
Graphicscard problems with Cinemadisplay?
- Subject: Graphicscard problems with Cinemadisplay?
- From: Thomas Holm/pixl <email@hidden>
- Date: Mon, 7 Nov 2005 15:52:59 +0100
Guys,
One of my customers have experienced a pretty annoying problem after
upgrading their monitors from LaCie CRT monitors to Apple
CinemaDisplay 23". They are using "nVIDEA GeForce FX 5200"
graphicscard with 64mv Vram.
The problem is Shadow separation.
After calibration (with multiple tools including Eye One Pro/Eye one
Display, and Eye One Match 2.03 and 3.02) there is a lack of fine
gradation in the shadow region. When checking near black separation
it show definition between 0-1%, but 1&2% shows the same value. Then
separation between 2-3% but 3+4% is similar, then separation with
nice increments from 4% and up. So instead of smooth dark gradation I
get severe banding. Monitor calibration parameters are 100cdm2 and
Gamma 2.2.
[In case you wonder how I measure black separation I use the real
World ColorManagement tecnique of making a new document filled with
black, setting proofsetup to monitor RGB (disabeling the profile and
only checking the calibration of the LUT) turning to FullScreen mode
(black) making a marquee selection, hiding this. Then open curves,
select the black corner on the curve, move the curves dialogue out of
sight and move the curve point up with the arrow keys]. This problem
persists on two different (but identical) setup's of a G5, Geforce
FX5200 and 23" CinemaDisplay.
Since they never saw this on their old LaCie Electron IV monitors I
wonder if the problem lies with the graphics card being insufficient
for an Apple CinemaDisplay 23" because of whatever reason, in which
case a better card should fix the problem. Or whether it's the actual
monitors.
I can't really get my head around why more Vram should improve the
number of steps one can see (I can see why a 10bit graphicscard
should though). On the other hand I've profiled many CinemaDisplays
always with great results.
Any ideas/hints are welcome.
Best Regards
Thomas Holm / Pixl Aps
- Colour Management Consultant
- Seminars speaker and tutor on CM and Digital Imaging etc.
- Apple Solutions Expert
- Member, ColorManagementGroup.com
- www.pixl.dk ยท email@hidden
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