VueScan and automatic exposure

[Stefan Krohmer]

Hi there,

I have a question concerning automatic functions in vuescan (newest version
8.4.60). I hope I can describe it in an understandable way ;-). Let me
describe the workflow reduced to the necessary:

1. Scan a preview of a color negative
2. Make a crop frame around the whole negative
-> Automatic picture colors and exposure look good
3. Make a crop frame around a part of the negative
-> Colors etc. change

This is not what I want. How can I switch off this second automatic thing?
How can I lock the settings from my first crop where the colors were right?
I have a photo with dark and light areas. The whole photo looks good, and
now I need a crop of the dark area without changing the exposure and
colors. Unfortunately I haven't found the appropriate switch.

Thanks for any hints!

Stefan

 

[Mike G.]

Hi there,

I have a question concerning automatic functions in vuescan (newest version
8.4.60). I hope I can describe it in an understandable way ;-). Let me
describe the workflow reduced to the necessary:

1. Scan a preview of a color negative
2. Make a crop frame around the whole negative
-> Automatic picture colors and exposure look good
3. Make a crop frame around a part of the negative
-> Colors etc. change

This is not what I want. How can I switch off this second automatic thing?
How can I lock the settings from my first crop where the colors were right?
I have a photo with dark and light areas. The whole photo looks good, and
now I need a crop of the dark area without changing the exposure and
colors. Unfortunately I haven't found the appropriate switch.

Thanks for any hints!

Stefan

Hi Stefan,

I'm using 8.4.57, but I think this is the same.

This procedure is rather indirect and not obvious, but not difficult.
It's part of what the manual calls 'Advanced Workflow', which involves
reading the film base color by scanning a piece of the film leader, but
if you're happy with the color you already have, it's not necessary to
do this operation.

What you want to do is go to the Input tab and near the bottom, check
the box for Lock exposure. This will make visible another checkbox,
further down called Lock film base color. Checking this one too will
make yet another one visible below, called Lock image color. Checking
that one will get you the effect you seek. You should now be able to
recrop however you wish, without triggering the automatic algorithms to
recalculate. Do these steps after you have made any color adjustments
you want in the Color tab, such as refining bp, wp, curve lo, hi,
various brightnesses, etc. In other words, just before your step 3. above.

Hope this is what you were looking for.

Best regards,
Mike

 

[Stefan Krohmer]

Hi Mike,

Hope this is what you were looking for.

that's exactly what I needed . Thanks a lot!

Stefan