photography

Cullendula

Written by  on April 3, 2018

Small program to pick out the best shots of the vast amount of taken pictures per session (excursion). The name itself is a wordplay of the plant Calendula and the activity “to cull” (slang for sorting the photos).

url for the repository: https://github.com/marcelpetrick/Cullendula/
development time for fully usable version 0.1: one day
used technologies: C++ and Qt – my favorite ones <3

Catcam upgraded!

Written by  on March 13, 2018


Terminator is watching you!

Finally! The old catcam-setup of a RPi 3 with a NoIR v2.1-camera was working for almost one and ahalf years without any issues. I’ve had improved the PiCamGifForTumblr-script several times, also changed location – never any issues. More than 40.000 GIF were uploaded.
But then I decided to buy a new, fancy case in black (of course) which should add some camera-support. And then two weeks afterwards it stopped working. Sporadically frozen. Sometimes 10 min after start, sometimes during the night. I checked the casing, if all power connectors were tightly fit, I installed netdata on it, I did longterm temperature-measurements (never over 54 °C even with closed case), I ran with minimal setup or with cam attached.
Then it became clearer: the camera was working for singleshot-mode, but for the 30 pictures every ten minutes, it broke. So, it was time to order a new camera, 1080p (5 MPixel) were enough, but for four more Euro I could get two IR-illuminators … so, why not? The focal distance of the objective is adjustable, it looks like it works (long time-test needed). But I am happy. And we can watch cats (and family) in darkness :3

doEis.sh: convert all negatives via negfix8

Written by  on April 15, 2016

reason: too lazy to call the negfix8-script for each file itself. Because conversion is fast but even with an SSD writing the ~120 MiByte files takes some time. Precious time ..

ps. ‘do eis’ is latin, not some german-english mumble jumble.

Applied science ;)

Written by  on July 31, 2015

From time to time I develop some filmstrips with C41-chemicals. The data-sheet gives already some valid combinations of time/temperature, but it was lacking the one for 30°C.
I put the filmstrips for 8 min into the tank with the old Tetenal-kit. But what about the Digibase one? Linear interpolation would be not sufficient.
So lets take the sampling-points from the datasheet and do some cubic fitting (polynomial degree one less than the amount of samples).
And now what? Compute it myself? Hell no 😉
Et voila (thank Stephen Wolfram).

curve
Fitting also shows no oscillation: good.

By the way: 7 min 30 s would be the correct time!