[sane-devel] It make sense to acquire "raw" data from negative scan?

[Rolf Bensch]

Hi Niccolo,

In TPU mode the scanner scans color negatives/slides in 48-bit
resolution and sends raw data to the frontend. You must store the scans
as PNG, PNM or TIFF images. Otherwise the frontend shrinks the image
resolution down to 24 bit.

You can also scan infrared images for dust removal. I haven't found any
free software for post processing yet.

Please report your negatives scan experiences, post processing and
archiving in the mailing list. Many thanks.

Cheers,
Rolf



Am 05.03.2014 18:03, schrieb Niccolo Rigacci:
> Hi to all,
>
> I wish to acquire several negative films with my new Canon 
> CanoScan 9000F Mark II.
>
> I cannot resolve a doubt of mine: does the color correction 
> at scan time influence how data is read by the device (e.g. 
> tuning the backlight or the sensor sensitivity)?
>
> With xsane I can adjust colors before scanning, using gamma, 
> brightness, contrast; there are also some "medium type" presets 
> for different film brands (Kodak, Fuji, etc.).
>
> Those parameters are applied before scanning, i.e. sent to the 
> scanner to obtain different readings? Or they are just applied by 
> software on the received "raw" data?
>
> In the latter case I would prefer to acquire without color 
> correction at all, and just apply the best recipe afterwards with 
> a batch software procedure. I wish also to keep the original 
> "raw" scan for future and better recipes.
>