Epson V700 / Vuescan Speed Question

[mathiasprinz]

Hey everybody,

i´m scanning 35mm b&w film with Vuescan on my Epson V700 on a regular basis. I use it with 16Bit at 3200dpi. Just recently i started scanning color – 48bit, 3200dpi – and noticed, that scanning works a lot faster. Shouldn´t it the other way round, as in color there are 3 channels to scan? The files in color are bigger also… am i missing something? Thanks in advance!

Mathias

 

[xvvvz]

If the times became a lot shorter with the color scans, then one or more of the options within Vuescan is different during the scanning sessions. This can take some time to track down given all of the tabs and lists of options within the Vuescan tabs.

Doug

 

[mathiasprinz]

Thanks Doug, I checked before, but like you said, there are a lot of different tabs. I´ll check again, maybe i can solve the problem myself.

 

[cabbiinc]

http://www.hamrick.com/vuescan/html/vuesc19.htm#topic16

There is no scaling or color correction of the raw CCD data in the scanning step. Some scanners either always or sometimes convert 10-bit or 12-bit CCD data to 8 bits before transferring it to VueScan, and then VueScan converts it back to 10-bit or 12-bit CCD data. This is done using the same gamma correction table specified by the sRGB standard.

Just a guess, but if your scanner delivers more than 8 bits per pixel to the program then the program will need to downsample that to 8 bits per if you have that option selected. By going with the native bits then you eliminate that step, but wind up with a larger file. Again, just a guess.