Negatives that are sometimes denser and/or harder may offer a better rendering when scanned as color negatives.
And in certain cases, we can also, with very underexposed and/or underdeveloped negatives, recover a little material by declaring the film as positive.
If the histogram protrudes to the right or to the left, the overall exposure of the scan is poor.
A negative (-) analog gain adjustment will reduce the brightness of the source and shift the histogram to the left.
The image is then denser and we can thus compensate for the “burnt” highlights.
Conversely, a positive setting (+) will slide the histogram towards the highlights and uncover the buried shadows.
An intensity level of 60 points, a width of 1 Pixel with a threshold of 15 points is a starting point for a 400 ISO film
To make this go unnoticed, it is better to use a tool with sharp edges on a layer
(depending on use: 300 DPI for printing and 72 DPI for the web)
then convert the file to RGB / 8 BIT / .JPG (without compression)