Optical/Spider black and white target points?
Optical/Spider black and white target points?
- Subject: Optical/Spider black and white target points?
- From: "Russell Proulx" <email@hidden>
- Date: Sun, 28 Sep 2003 21:40:29 -0400
- Priority: normal
(Sorry if this was already posted. Email has been problematic lately
and some things re not getting through..)
I was just reading Colorvision's Spyder/Optical Guide (after
downloading the most recent Optical update) and read the following:
"It is preferred with Windows PC's that the Spyder be plugged into a
separate PCI USB card rather than into USB ports built into the
motherboard."
Anyone know why the USB ports on a contemporary motherboard might be
considered inappropriate for using hardware calibration devices?
I also wonder about the Spyder's .30 black 'precision mode' target
setting in the previous version of Optical? In Real World Color
management there's a test for the black point outlined which suggests
raising and lowering the black value of a selected area of a 100%
black image in RGB and noting whether a difference can be seen when
lightening 1 to 2% while using the monitor colorspace. With a
blackpoint target of .30 I easily see a difference between 0 and 1
and continue to see a difference if I set my brightness even lower.
Is .30 is too high? I'm using a Mitsubishi DPro2040u.
With the most recent version of Optical I now note that there are NO
longer any preset default settings for white or black points and when
I select proceed the suggested defaults are .19 and 88. Is the
visual target offered by Precal perhaps more accurate than any pre-
defined measurement? Does this also suggest that the old 80 luminance
was too low? The Precal suggested luminance range for the RGB color
guns in 85-95. Is higher better? I'm not matching multiple monitors
in a group workspace.
So many questions ;-)
Thanks for any answers.
Russell Proulx
Montreal, CANADA
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