Resurrecting old color slides

[Ofnuts]

If you look at the histogram (the shape in background of Curves), your photo has no highlight (the histogram should touch the right side). And if you take out the Pointer dialog and explore the clouds, you find that the green component in them is a bit weak (they should be neutral gray). So a quick fix is to use Curves on each channel to:

1. restore the white point by making the curve hit the ceiling where the histogram stops
   
2. increase contrast a bit by giving a slight S shape to the curve
   
3. give a small boost to the Green channel by putting its curve slightly above the two others.
   

   

   

Remarks: to minimize color loss:

• Work in 32-bit precision
  
• It's best of you do everything in one shot (which is why Curves is the best tool)
  

Otherwise, did you try Color>Auto>Equalize?