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

[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.

-- 
Niccolo Rigacci - http://www.rigacci.net/
Campi Bisenzio - Firenze - Italy
Tel. Office: +39-055-9331021, Mobile: +39-327-5619352