Michael Heald
9-Apr-2006, 14:52
Hello! I am a newbie at scanning and image manipulation. I've tried some astrophotography in the past, and in astrophotography, the best final images are captured with mutliple exposures, with the subtraction of dark frames, and the division by flat frames.
I've read that some software will autimatically take multiple scans and average them.
Since Dark Frames are designed to subtract digital noise by obtaining images that have had no light exposure and flat frames are designed to detect how different pixels may respond to light differently by exposing them to a light field that does not change across the field of view, would either of these two techniques be useful for scanning negatives? Or is the exposure generally short enough that noise is not an issue, and the optical train good enough that flats would not benefit the final product?
Thank you and best regards.
Mike
I've read that some software will autimatically take multiple scans and average them.
Since Dark Frames are designed to subtract digital noise by obtaining images that have had no light exposure and flat frames are designed to detect how different pixels may respond to light differently by exposing them to a light field that does not change across the field of view, would either of these two techniques be useful for scanning negatives? Or is the exposure generally short enough that noise is not an issue, and the optical train good enough that flats would not benefit the final product?
Thank you and best regards.
Mike