Today I learned / realized / released.

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See only the TIL photography posts here.

A UV filter for your lens. 20 May 2021

[photography] A quick note, I was rather late in getting UV filters for all of my lenses. They are a lot less expensive than lenses, and many people use them...

Custom image width in Markdown / html. 05 May 2021

Today, I wanted to change the width on an image, in a webpage, that was written in Github-flavored Markdown. Like, groan. I had read this page at some pre...

2D rotations in Eigen (C++). 03 May 2021

Eigen, the matrix library in C++, is so cool. Having written some of these functions during the 00s in my own code, agonizing about whether I got the subsc...

How to create a montage in ImageMagick. 02 May 2021

Supposing you want to see a whole directory of images, resized and smooshed together into one image. (Having a crash? New section.) This is easily done in ...

Selecting GPUs in PyTorch. 14 Apr 2021

I have a weird configuration, one older GPU that is unsupported by PyTorch and one newer GPU that is supported by PyTorch. With Docker, I was able to specify...

YAML is weird. 15 Mar 2021

Igal Tabachnik had a shitpost about YAML on Twitter. I didn’t totally get it, so I keep reading and was rewarded with not only understanding the shitpost, bu...