OlegK said:
It looks like IR cleaning with VueScan 7.6.75 on Minolta Scan Elite 2
doesn't work properly.
At least the options (none, light, medium, heavy) are either reversed
or improper. With the "heavy" option, there's apparently no cleaning
at all. With "none" something happens, but it looks more like grain
reduction.
Do you have any clue on this issue?
I'm still having problems with IR cleaning on my SE5400. VueScan seems
to involve the edges of the frame in the blurring process. I reported
having this problem with Velvia 100 slide film but now I have it with
negatives as well. The problem only occurs in VueScan, not in the
Minolta software. If I save the IR channel from VueScan, though, it's
perfectly usable to create a selection for scratch removal with a
self-made Photoshop action, so I guess something's wrong in VueScan's
cleaning algorithm.
I don't have the reversal-of-options problem you are reporting; my
observations are based on versions 7.6.70-7.6.74
I put some examples on the web (poor image quality because of low
scanning resolution):
Scanned image, at low resolution, light IR cleaning in VueScan,
converted to sRGB and saved as low-qualty JPEG for the web:
http://www.vandervegte.com/Temp/RGB-IR-cleaned.jpg
Look at the extreme artefacts on the right-hand edge, in the tree.
RGB image from VueScan, no IR cleaning:
http://www.vandervegte.com/Temp/rgb.jpg
(you can switch back between this image and the previous to see the
effect of 'cleaning')
IR channel from VueScan, converted to grayscale:
http://www.vandervegte.com/Temp/IR.jpg
Preview screenshot, rotated, showing IR detect color:
http://www.vandervegte.com/Temp/IRpreviewRotated.jpg
(note that the red area is fuzzy because of the JPEG compression)
