[filmscanners] Re: Grain In scanned 35mm film

["Arthur Entlich" <artistic-1@shaw.ca>]

Hi Howard,

How are you sharpening the images?  Do you sharpen the RGB image or go
into lab mode and sharpen the luma channel? That method may lessen
apparent grain for large prints.  Is it possible you are oversharpening
the image.  Many of the programs you speak of use smoothing algorithms
which just counteract the sharpening process.

Do you use the threshold adjustment in unsharp masking for broad areas?
The problem is all sharpening process exaggerate artifacts.  Have you
tried backing off a bit on the unsharp masking and see if the results
might be more pleasing?  If the "grain" mainly shows up as the result of
unsharp masking processing, it might be better to lower the amount of
this rather than trying to fix the problem with another filter process.

Art

Howard Grill wrote:

> How effective are products like Grain Surgery, Neat Image and Noise Ninja at
> removing what appears to be film grain after sharpening images scanned at
> 4000 ppi.  My 35mm film is scanned on a Polaroid SS4000 Plus and taken on
> Velvia and Provia...so the film is fine grained.  But I still find the grain
> I see after scanning and processing as objectionable when I am making large
> inkjet prints to 13x19 inches.  The grain does not appear to be problematic
> at 8x10 type sizes.
>
> Howard
>

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