SilverFast Blog

Image auto adjust button

The image auto adjust tool  can be set to perform certain picture enhancements based on the scanning frame highlights and shadow points (e.g. contrast, color correction, color cast removal or preservation).

To activate, deactivate or manage certain parameters or correction values of the automation in SilverFast Ai you have to:

Access the options panel and select the “Auto” tab. There you will find a window like the one below this line:

Threshold

The first two options let you set the threshold value for highlights and shadows.

Threshold values for highlight and shadows

These control the sensitivity of the tool at the both ends of the histogram. Lower values will skip very few pixels  where as larger values will skip more pixels at the end points of the histogram. If you set the value to 0 the higlights and shadow points will be set in the first pixel found at each end of the histogram. This might be tricky because scratches on the film emulsion or dust particles might be represented in those ends, but those do not belong the the picture itself, if you have a scratched film you might want to use a value between 2 and 10.

The automatic threshold for highlights and shadows can be activated or deactivated by ticking the checkbox right next to them.

Color Cast Removal

Allows you to set the percentage value of remotion of color casts, the checkbox right next to it lets you activate or deactivate the color cast removal with the Image auto adjust button. If you want to preserve color casts like on sunsets or dawn atmos you can deactivate this option.

Auto color cast removal