Prescan becomes over exposed in final moment

[Captain Kidd]

Hello,

I am a new customer so very new to this but I have searched and read up on as much as I can but I cannot find what is causing this problem.

I am using a Plustek 8200i SE with Silverfast SE Plus.

I open Silverfast, set it to negative and click Prescan

As the negative is scanning I begin to see the image and it looks good see 'Image 1' attached which includes my settings.

But when the image reaches the bottom and stops scanning, the finished image quickly turns to over exposed, see 'Image 2'.

What am I doing wrong? I reset all settings to default but am continuously getting the same problem.

[LSI_Ketelhohn]

Dear user,

You need to set the highlights and shadows for your image.
You can do that either by using the image auto adjustment (the button above the preview labeled Auto CCR).
Clicking and holding it will give you access to various correction methods.
You can also do this manually in the Histogram or using the Pipette tool.

The background is that the scanner's range of brightness is much larger then the one in the image.
Black for the scanner is when no light reaches the sensor, but even the darkest areas in the film let some light reach the sensor.
True white for the scanner is when all the light reaches the sensor, but even the brightest areas in the film do absorb some light.
So all values fall in some kind of grey value.
Setting the highlights and shadows corrects this by moving the darkest and brightness point in the histogram to the actual values in the image.

Kind regards,
Arne