Can I control channel used for 16-bit greyscale?

[DavidMLewis]

Hi,

I'm scanning B&W negatives that were processed in a pyro developer. Because of this, the image is formed partly of silver grains and partly of a yellowish stain. Thus I want to use only the information from the blue channel. I can scan in 48-bit RGB mode (I'm using a Kodak RFS-3600) and then use Photoshop's channel mixer to isolate the blue channel and convert it to greyscale, and this works well. But because the scanner is old and attached via USB 1.1, it would be nice both from the standpoint of time and file size not to scan and push down the wire the two channels I know I'm going to throw away. Is there any way of telling SilverFast AI 6 which channel to use for a greyscale scan? Thanks in advance.

David

[LSI_Flyvbjerg]

Dear David.

Try the following:
- Open the options dialog
- select the special panel
- from the color filter popup, select blue.

Some scanners to support the scanning of single colors. In this case the reduced amount of data would increase scanning speed.
Other scanners do not support this features. In this case SilverFast needs to scan RGB data and then extract the blue channel from there.

Best regards
Eric Flyvbjerg

[BB]

But be aware that the blue channel is usually the most noisy one; of course, there is no option if the other channels are unusable, but it might be good to keep that in mind.

BB