Moires

[woopit]

I read the following tip on this fourm regarding fixing moires.

Q:
When scanning from photos or even film material (transparency) sometimes the scan result shows a regular pattern all over the image - this can't be a moir? pattern, can it?
A:
This pattern is often due to calculation algorithms in the software (problems with high frequencies in image).
Workaround 1: set SilverFast's interpolation algorithm to "Anti Aliased" (Option > General)

I can't find this option in my application. I am using SilverFastSE 6. Does this application have that option? Thanks.

[LSI_Noack]

Dear woopit

unfortunately it doesn't. However, you might want to known when you would choose interpolation via anti-aliasing algorithms:
When you want to go to a output resolution that's only slightly different to a scanner's input resolution, because in such cases other interpolation algorithms (e.g. bi-cubic) can cause artificial "patterns" to appear in your images.
Please note, that anti-aliasing interpolation takes longer to calculate though, and therefore isn't used in SilverFast SE.

So, what can you do:
You either download the Ai Studio demo and check - by setting it up identically to your SE, but changing the interpolation to anti-aliased - if that's actually the source of your trouble.
And / or, you select an output DPI value identical (or at least significantly different) from your input (/ scanner) DPI value.

Best regards
Sonny Noack
- Manager Technical Support, LaserSoft Imaging AG -

[woopit]

I'm not sure I understand your reply...
And / or, you select an output DPI value identical (or at least significantly different) from your input (/ scanner) DPI value.

Are you saying to try either side of the coin? That is either selecting an output value identical to the scanner input value... and if that doesn't work then... try selecting an output value that is different from the scanner input value?