On the right you can see three printed targets — underexposed, normal and overexposed Kodak Portra 160VC film. They are printed manually directly from negatives in the darkroom using optical enlarger with color head and wet processing RA4.
On the left you can see 14 (in this case) test prints – made to achieve needed white balance and exposure. Each sample is developed, bleached, washed and dried for total of 4:20 min in RA4 paper processor.
Afterwards each print is measured with a spectrophotometer. Depending on results we add color head and exposure time corrections for the next sample.
Final prints have been scanned in a special way. With these prints we built a new mLUT film profile for Dehancer using our non-linear mathematic methods.