Density Range Epson Ultrachrome inks · 27.12.16

In this graph the density range of epson ultrachrome inks is plotted. In the higher densities some irregularity is visible due to noise in the measuring method. Measurements by Ian Parker

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Eskofot 245 FPP plate burner · 3.09.14

I found a used Eskofot 245 FPP plate burner. Does anybody know this plateburner and how to program it? Or, even better, who has a manual for it?

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APUG group buy DAS · 30.04.13

This is a quick test with a 3% solution of DAS (CAS 2718-90-3)

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Gum concentration · 23.10.08

Hydrometer measurements on often used gum solutions for gumprinting

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Simple and cheap UV unit · 25.07.08

A simple UV exposure unit can be made with 8 to 10 standard 60 cm 20 Watt TL tube fittings. Attach them to a piece of plywood. You have to use 20W, 36mm UV tubes, but these can be found easily.

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Curve Flipping · 10.03.08

A correction curve for digital negatives that is meant to be used on a positive image before inverting to a negative should not be confused with a curve that has to be applied to an allready inverted image. There are two ‘schools’ of curving for digital negatives. It’s like driving left or ride side of the road. In both cases you will arrive from A to B but you should never mix the method.

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Curve Merging · 14.11.07

From time to time curved digital negatives need some more tweeking. Whith a curvemaking tool like Chartthrob it is easy to run a second pass on an allready curved grayscale chart. But how to merge the two curves in one new curve?

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