U of S | Mailing List Archive | alt-photo-process-l | Re: Measuring DMAX

Re: Measuring DMAX

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.