I kinda expect folks here that know how to make H&D curves already probably have their process setup the way they want, but nonetheless, I thought I'd share what I've come up with:
https://www.youtube.com/watch?v=PGKP2upe2aw
Of note, I still actually do H&D curves on paper to calculate the gamma and contrast index. It's also kinda nice meditation time of sorts but I do like to be able to see different film curves sort of "at a glance" and also it's nice if I need to look up a specific test to know what development time I should shoot for.
Since I made the video, I finished implementing the missing bits (like being able to add step tablets - that's kind of important) so it is now usable, if still perhaps a bit rough around the edges.
I've been thinking about how to approach gamma and CI but haven't quite figured out the best way to do that. I need to figure out trendlines first and also need to work on how to find values on the graph (I'm using charts.js here for the curious).
Final note, for Windows users, the BTZS Windows app, while I think fairly dated, likely does all this (and more) but for me it's nice to have all this in one place as I also use my app for film logs, tracking my replenishment, darkroom printing, film stock, holders, etc.
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