On Sun, 2006-02-19 at 15:48 +0100, Krzysztof Halasa wrote:
> It looks like the black calibration (lower values, around 70) is the same > data in both 8-bit and 16-bit mode (i.e., in 8-bit mode the LSB is > present and 6-bit MSB is assumed to be zero). > > I will experiment with this a bit longer - probably someone has an idea > how to set 16-bit gamma tables and/or to set "analog" gamma value (to > 1.0) so the scanner doesn't modify the data? > > Or maybe it's already transparent, i.e., the scanner does no gamma > but just brightness and contrast (already set to 128 = neutral)? > The peak values are a bit different from the 14-bit calibration > data * 4, the range should be something like 280 - 60500. > -- I am myself very interested in what you are currently trying to achieve. If I can help you or Oliver with some tests (I own also a PF 3490), please don't hesitate to write me! Do you know whether this scanner sets a different focal plane when scanning slides/film compared to the flatbed (as it should)? One very important aspect in film scanning is to have the material exactly in focus. Higher-end scanners can adjust their lens accordingly. Also, I am not convinced we should always follow the Windows driver to the letter. I mean maybe the hardware is capable of more than the windows drivers are programmed for. Low-end scanners are marketed and sold with shallow profit margins, that's why they often lack data/spec sheets and their drivers are not always as elaborated than those of their bigger cousins. Levente