Re: VueScan: (was: Re: Measuring DMAX
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- Subject: Re: VueScan: (was: Re: Measuring DMAX
- From: Katharine Thayer <email@example.com>
- Date: Fri, 01 Feb 2008 08:46:12 -0800
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Thanks, but not true; my three numbers are all different; I've never
gotten three identical numbers, either in 8 bit or 16 bit, or even in
1 bit! They generally range over 6 or 8 points, but sometimes as
much as 12 or 15. If they were identical, do you really think I'd be
asking the question?
On Feb 1, 2008, at 1:23 AM, Kees Brandenburg wrote:
Missed your first question. When you scan in grayscale (set bits
per pixel to 16 or 8 in the input tab) you still get 3 numbers but
they are identical. You can use either one as your density reading.
This is different then a real visual density measurement by a
densitometer, as there is a RGB to grayscale conversion - but in
fact it's pretty close.
On 31 jan 2008, at 17:36, Katharine Thayer wrote:
On Jan 23, 2008, at 5:25 PM, Katharine Thayer wrote:
On Jan 15, 2008, at 12:46 AM, Kees Brandenburg wrote:
Kees, I get three density numbers at any given point whether the
image is in color or black and white. Is it reading three color
densities for each point, or what? I can't see any particular
relationship between the density readings and the 0-255 readings
from the same coordinates (that you get when you stop depressing
the control key). Is there any way to get one density reading
for a point?
Vuescan <http://www.hamrick.com> can do that. First check the
'Enable Density Display' option in preferences. Then point your
mouse to a location in the scan/preview window and hold the
control key. Vuescan displays the log density readings of the
raw scan. These readings are not altered by your scanner
settings or profile.
I asked this question a week ago and am still waiting and hoping
for an answer. Searching the archives this morning, I found an
answer from Yves I hadn't noticed before, saying that in his
version of VueScan, if he's in black and white mode, he gets one
That's great, but it doesn't answer my question, since in my
version of VueScan, as I said in the earlier post, I get three
density values whether I'm scanning in color mode or in black and
white mode. I was hoping someone knew a way to fix that. I
haven't actually purchased the VueScan; I'm just using the
downloaded version for the purpose of reading density values. If
it actually worked, I might be tempted to purchase the program,
but so far it's not terribly useful to me to have three different
density values for any given point. This is with VueScan 8.4.56,
the version of VueScan that is supposed to work for Mac 10.4.