Re: Measuring DMAX

[Kees Brandenburg <ctb@zeelandnet.nl>]

On 15 jan 2008, at 15:22, Yves Gauvreau wrote:

> In the case of scanned image, while in VueScan or some other scanning
> software you may want check it out with a gamma of 1.
Not with the vuescan density measurement tool. Any setting will give  
the same density reading (but not the same scanned file). Vuescan uses  
the raw output of the CCD for this. Optical density readings are  
measured as log (max_colour from CCD/raw_colour from CCD). These  
density readings can be accessed in Vuescan when moving the pointer  
over the scanned image while holding ctrl.

-k