Started creating browser-based calculators for quickly computing a bunch of recurring things in darkroom processing, so far:

Scale amount by area:
Given reference dimensions and amount, compute scaled amount needed for new target dimensions.
Example: Compute drops of emulsion needed for a new print size

Two-part solution ratio:
For a total volume of a two-part solution with a A:B target mix ratio, compute how many units are needed of both A and B.
Example: For N drops in total, compute how many drops are needed for A & B using a 1.2:1 target ratio

Solution addition:
Compute the amount of solution A (with given concentration) to add to another volume to achieve a certain target concentration (for solution A)
Example: How many extra drops of a 25% contrast agent solution are needed to achieve a 5% solution with a certain base emulsion volume

More calculators forthcoming... Feel free to ping me with any other useful formulas you'd like to have added...

Bookmark this on your phone:
https://demo.thi.ng/umbrella/darkroom-calc/

(The UI is responsive to the system's dark mode setting)

Source code:
https://codeberg.org/thi.ng/umbrella/src/branch/develop/examples/darkroom-calc/

Btw. This is https://thi.ng/umbrella example project #186 and relies mostly on these packages:

- https://thi.ng/rdom & https://thi.ng/rstream for reactive UI & computation
- https://thi.ng/rdom-forms for reactive form element abstraction/creation

#ThingUmbrella #AltProcess #Darkroom #DarkroomPrint #AnalogPhotography #Calculator #Reactive #UI #TypeScript