Module chart 

What the developed strip did, as a densitometer reads it.

A print is a picture; the chart beside it is the measurement the picture came from. The wedge is kallo-view’s, because that is the one the committed strip was drawn from: nine patches from −2.0 to +0.8 log exposure, the same span in both places, so a chart of a developed roll can be read against the chart the app ships.

The numbers are not the curve sampled at nine exposures. They are what an instrument reads off the developed strip: the dye the development formed, plus the base, fog and mask the light also passes through. That is the difference between a characteristic curve and a densitometer reading, and it is the difference the interface’s isMeasured names.

Structs

FilmCurve

A film’s characteristic curve, sampled over its exposure range.

FrameChart

One frame’s densitometry, as the interface draws it.

PaperChart

A paper’s characteristic curve, sampled for a panel to draw.

PrintChart

The print’s tone: the paper’s curve through one enlarger balance.

PrintChartOptions

The enlarger settings a print curve is drawn under.

Functions

chart

Chart a stock at a ladder of development times.

chart_for

Chart a stock by id.

film_curve

The film’s developed curve, by id.

paper_chart

A paper’s curve, by id.

print_chart

The print curve, for a film, a paper and a development.

print_chart_with

The print curve under one enlarger setting.