charge bleeding is a characteristic of CCD sensors, once the electron wells get
filled up you get these vertical smears as the charge "bleeds" into adjacent
pixels..its a hardware problem, can only be solved by limiting the exposure.
I suggest you do multipass with the Canon instead of a "long pass exposure" if
you want to capture shadow detail in slides.
"bjs" <email@example.com> wrote:
>I agree, although Vuescan long pass currently seems to make some very simple
>assumptions about the CCD charge bleeding characteristics. At the very
>least it would be nice not to have Vuescan include charge bled pixels in its
>output as it currently does. The examples I posted earlier provide enough
>information for a more sophisticated approach. Whether it's worth it or not