Free choice of tonal values

[gserim]

@Wlodek

or this

Yeah, Acid soaked

[gserim]

The sinusoidal adjustment doesn’t look bad either. The picture shows a sunrise in South Australia 50 years ago on slide film with a distinctive blue cast. The image always suffered from the corrections I had previously tried. The experimental tonal correction gives better results - there’s more to it.

[gserim]

This is the target color scheme after the adjustment - adapted to the sunset.

[gserim]

Histogram per color “wrapped” with tone value curve.