Vuescan 8.0.8 "Improved color correction"?

  • Thread starter Thread starter Erik Krause
  • Start date Start date
E

Erik Krause

Hello,

anyone knows what
Improved color correction when "Input|Media" is "Slide"
does exactly mean?
 
Erik said:
Hello,

anyone knows what
Improved color correction when "Input|Media" is "Slide"
does exactly mean?
Click to expand...

Sometimes I am thinking: if it ain't broken, don't fix it.
I am still with 7.6.78. I moved to 8.n a few times and I
always hit some issues with the Gui... Now I am waiting
for a few releases to pass by! You guys find the bugs! :-)

Thomas
 
Now I am waiting
for a few releases to pass by! You guys find the bugs! >:-)
Click to expand...

A few releases? heh....you wait, babe.


Erik, it probably means that one scanner has a better colorcorrection
while it screws up life for the rest of the scannerpark supported.
Isn't that the way it always has been? Don't tell me that you don't
see any differences using your scanner!? Lucky you. Please tell us
what brand! ;o)

nikita
 
nikita said:
Erik, it probably means that one scanner has a better colorcorrection
while it screws up life for the rest of the scannerpark supported.
Isn't that the way it always has been? Don't tell me that you don't
see any differences using your scanner!? Lucky you. Please tell us
what brand! ;o)
Click to expand...

No, it means that the slide film color correction matrix is now being
applied properly (it was being applied twice before). This results in
colors that are correct, along with the Kodachrome or Ektachrome
sensitometric curve.

It's easy to verify - do a scan with 8.0.7 one with 8.0.8 and
compare the colors - then hold the slide up to a light and
see which version produces colors that are more accurate.

Regards,
Ed Hamrick
 
Ed Hamrick said:
No, it means that the slide film color correction matrix is now being
applied properly (it was being applied twice before). This results in
colors that are correct, along with the Kodachrome or Ektachrome
sensitometric curve.
Click to expand...

Ok, that's what I wanted to know. It does not appply to generic slide
then...

Ed, I would very much like to see a small comment like the above one on
your web page any time there are changes where there is not sufficient
information in a single line.
 
No, it means that the slide film color correction >matrix is now
being
applied properly (it was being applied twice before)
Click to expand...

-------

I see.

Then those who scanned a few hundred slides with the faulty version
now can start over again....good for them to to know. If they've done
this scanning during their professional hours they lost time and money
on that bug. I assume that some of them will accept the resulted scans
as is and let their client have it as is without telling them anything
about it.

Actuallt this is a pure bugfix, not something that should be called
"improved" colorcorrection. Improved gives me an impression of
something else as a startingpoint.

I'm sorry for beeing a pain in the ass, Ed. But I do have a point and
intention with it from time to time.

I'll second Eriks request.

nikita

Ps. I haven't read the explanation in the Vuescan history for this
bug. If Ed was calling it something else than an improvement, I
apologize.
 
-------

I see.

Then those who scanned a few hundred slides with the faulty version
now can start over again....good for them to to know. If they've done
this scanning during their professional hours they lost time and money
on that bug. I assume that some of them will accept the resulted scans
as is and let their client have it as is without telling them anything
about it.

Actuallt this is a pure bugfix, not something that should be called
"improved" colorcorrection. Improved gives me an impression of
something else as a startingpoint.

I'm sorry for beeing a pain in the ass, Ed. But I do have a point and
intention with it from time to time.

I'll second Eriks request.

nikita

Ps. I haven't read the explanation in the Vuescan history for this
bug. If Ed was calling it something else than an improvement, I
apologize.
Click to expand...

So for some time, I've been hearing "scan as image, don't use slide
profiles". I think this was even the recommendation from Ed Hamrick
(excuse me if wrong on this).

My very limited experience with the Vuescan slide profiles was that
they produced poor results. Highlights seemed to have a strange lurid
yellow edge on my provia100 scans.

Thought, in light of ongoing Vuescan revisions (bug fixes?):

Save Vuescan raw files, and if you're going to invest time in manual
cleaning, clean them.
 
Mendel Leisk said:
So for some time, I've been hearing "scan as image, don't use slide
profiles". I think this was even the recommendation from Ed Hamrick
(excuse me if wrong on this).

My very limited experience with the Vuescan slide profiles was that
they produced poor results. Highlights seemed to have a strange lurid
yellow edge on my provia100 scans.
Click to expand...

That is most likely because 'Media type: Slide' imperatively needs to
use advanced workflow. If you don't use advanced workflow, vuescan
tries to determine film base color from the slide itself. This fails -
contrary to negative where the image border is clear - for slides.

If there is no clear area (and this is only the case if you overexposed
the slide) vuescan treats the brightest area as 'film base', which is
wrong most of the time.
 
Erik Krause said:
That is most likely because 'Media type: Slide' imperatively needs to
use advanced workflow. If you don't use advanced workflow, vuescan
tries to determine film base color from the slide itself. This fails -
contrary to negative where the image border is clear - for slides.

If there is no clear area (and this is only the case if you overexposed
the slide) vuescan treats the brightest area as 'film base', which is
wrong most of the time.
Click to expand...

This is exactly right, and is why I always recommend people try
setting "Input|Media" to "Image" - there's no issue with film base
color this way.

Regards,
Ed Hamrick
 
Ed Hamrick said:
This is exactly right, and is why I always recommend people try
setting "Input|Media" to "Image" - there's no issue with film base
color this way.
Click to expand...

An additional hint to advanced workflow would perhaps help to avoid
misunderstandings...
 
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