Problems with scanning (Canon 9000F)

[dkphoto]

Greetings!

I have a little problem with my scanner and some negatives with homogeneous areas (sky, water etc..)
The areas look really streaky after scanning.
The negatives seem to be fine and clean, the prints from the lab look clean, too.

I'm using a Canon 9000F for my medium format negatives with Silverfast SE. I tried another software and different settings but i didn't find a solution.

Any ideas? Defect?

Samples:

 

[The Standard Deviant]

Are there some small holes on the film holder that you are partially obscuring?

 

[HoodedOne]

what are your settings?

 

[dkphoto]

Are there some small holes on the film holder that you are partially obscuring?

Sorry, i don't get what you wanna say.
Holes?

what are your settings?

4800dpi
48->24 Bit Color
TIFF
No automatic correction or sharpening in silverfast
Picture Typ: Standard
Standard Profile in Negafix (no CCR)

 

[The Standard Deviant]

I wasn't clear, and I was asking based on what has caused stripes when scanning with my Epson V500.

I've just had a look online at the Canoscan film holder, and there is a calibration area on the side, a rectangular hole in it. Do you have any film covering this hole?

 

[dkphoto]

I wasn't clear, and I was asking based on what has caused stripes when scanning with my Epson V500.

I've just had a look online at the Canoscan film holder, and there is a calibration area on the side, a rectangular hole in it. Do you have any film covering this hole?

Ah, ok.
No, none of the visible holes is covered, the negatives are mounted correctly.

 

[venchka]

Try this:
16 bit RGB or 48 bit color. Whatever the software allows. Don't go to 24 bit.
2400 DPI. That is more than enough for medium format.
Does Silverfast have any preset film profiles that match your type of film? What film is it?
Good luck.

 

[venchka]

ps: Save as 16-bit TIFF file.

 

[dkphoto]

Try this:
16 bit RGB or 48 bit color. Whatever the software allows. Don't go to 24 bit.
2400 DPI. That is more than enough for medium format.
Does Silverfast have any preset film profiles that match your type of film? What film is it?
Good luck.

The SE Version only offers 24bit and 8bit TIFF.
Should i try a demo version of Silverfast which offers 48bit and 16bit?
But can this really be the problem?

The film is Portra 400NC and yes, there is a matching profile, but it makes everything even worse.

 

[venchka]

I only scan in 16-bit mode, B&W or color. I have noticed some uneveness in the sky. Mostly in B&W which I develop myself and that may be the problem. I don't notice any uneven sky problems with color when I scan in 16-bit color (48-bit RGB).
I'm glad you told me about the 8-bit limit of Silverfast SE. That is not good.

EDIT to ADD: Link to large Kodachrome scan. Look at the sky.

http://gallery.leica-users.org/d/251876-4/Fall+Leaves-5.jpg

another.......

http://gallery.leica-users.org/d/187268-1/Wayne_Torry_05.jpg

and one B&W....

http://gallery.leica-users.org/d/165972-1/Ench+Rck006-5.jpg

 

[venchka]

and yes.....16-bit images are smoother and have more colors or shades of grey than 8-bit.

 

[Gabriel M.A.]

I've seen this before. I think that if you put your negative on a lightbox and then use a reasonably strong magnifier (16x or more) you may see this "streaking". I think that the lab technician screwed up something in the chemical/chemical mix/temperature/etc. Either that or your film suffered from not-very-good storage (strong temperatures/temp changes while in the camera, in the package, or elsewhere)

I've had some negatives ruined before this way, and it's not very evident until you scan them, because you won't see it with the naked eye.

 

[venchka]

I suppose there is that possiblity. I've been lucky I guess.
Try a roll of fresh film & a different lab?