help with sane slide scanning

  • Thread starter Thread starter Another Bob
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Another Bob

Sane is working well with my CanoScan FS2710, and I am now attempting to
scan about a thousand negatives with it. I am having horrific problems with
color balance (I guess).

All my scans come out bright orange, and no amount of fiddling with color
balance, curves, and other color adjust ments in GIMP gets me a good image.

However, the preview in SANE has about the right colors, although they
appear to need some saturation and contrast adjustment, all of which can be
done in GIMP.

It seems to me that if SANE can get the colors right in preview, it ought to
be able to correct the actual scan. Any idea how to save the corrected
image instead of the bright-orange scan image?

Any idea greatly appreciated.
 
Another said:
Sane is working well with my CanoScan FS2710, and I am now attempting to
scan about a thousand negatives with it. I am having horrific problems
with color balance (I guess).

All my scans come out bright orange, and no amount of fiddling with color
balance, curves, and other color adjust ments in GIMP gets me a good
image.

However, the preview in SANE has about the right colors, although they
appear to need some saturation and contrast adjustment, all of which can
be done in GIMP.

It seems to me that if SANE can get the colors right in preview, it ought
to be able to correct the actual scan. Any idea how to save the corrected
image instead of the bright-orange scan image?

Any idea greatly appreciated.
Click to expand...

I guess I should probably mention I am using XSANE frontend for this.
 
Sane is working well with my CanoScan FS2710, and I am now attempting to
scan about a thousand negatives with it. I am having horrific problems with
color balance (I guess).

All my scans come out bright orange, and no amount of fiddling with color
balance, curves, and other color adjust ments in GIMP gets me a good image.
Click to expand...

IOW, they come out looking like negatives?
However, the preview in SANE has about the right colors, although they
appear to need some saturation and contrast adjustment, all of which can be
done in GIMP.
Click to expand...

I'd think if the scan were correct there would be no need for color
correction.

I used a little HP S-20 for a couple of years and never had to change
the color balance.
It seems to me that if SANE can get the colors right in preview, it ought to
be able to correct the actual scan. Any idea how to save the corrected
image instead of the bright-orange scan image?
Click to expand...

All the programs I've used so far have done the reversal right at the
start.

There should be a menu item in the image processing to select
reversal, or a specific item for scanning negatives. Make sure you
are not still in the regular scan mode or transparency mode.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
 
After a little more experimenting, I can say a bit more concisely what I
mean: The "preview" image will automatically correct the colors, and I can,
of course correct the orientation and select the scan area. The actual
scanned image corresponds to the orientation and selected area, but but the
color corrections are not applied. The negative reversal does work. The
scanned image is positive, but badly colored. All the comments (I hesitate
to say "documentation") I have found suggests that the color correction
ought to work in the scanned version as well as the preview, but it doesn't
seem to be the case.
 
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