Vuescan/FS4000: How to find a transparent area in APS film

[GeorgeEE]

The advanced workflow suggested in Vuescan Help, requires you to find
a transparent area in the film so that you can use it to set the film
base lock and exposure lock when scanning a roll of film.

I'm scanning an APS roll in the Canon FS4000, so how can I manually
manipulate the APS roll to find such transparent area??

Thanks for your help

 

[Bruce Graham]

The advanced workflow suggested in Vuescan Help, requires you to find
a transparent area in the film so that you can use it to set the film
base lock and exposure lock when scanning a roll of film.

I'm scanning an APS roll in the Canon FS4000, so how can I manually
manipulate the APS roll to find such transparent area??

Thanks for your help

I just let it preview the first frame and hopefully there is an unexposed
section. If the exposure it discovers is above 2 or I can't see an
unexposed section on the preview, I lock exposure to 2 (which seems to be
pretty close to what it will normally find) and do another preview to
lock film base colour. Then I check the histogram for reasonableness.
This subject has been on my list to explore, so I'd like to hear of a
better way!

Bruce Graham

 

[Bruce Graham]

The advanced workflow suggested in Vuescan Help, requires you to find
a transparent area in the film so that you can use it to set the film
base lock and exposure lock when scanning a roll of film.

I'm scanning an APS roll in the Canon FS4000, so how can I manually
manipulate the APS roll to find such transparent area??

Thanks for your help

I should have mentioned that the exposure of the FS4000 is not
continuously variable. I understand that it varies the stepper motor
speed along the film in discrete steps 1,2,3 etc. so you don't have to
worry about the difference between 1.9 and 2, (even though Vuescan
reports the exposure to about 4 decimal places).

Bruce Graham