Hacker News: alter_igel

New comment by alter_igel in "Ti-84 Evo"

alter_igel — Sat, 02 May 2026 05:32:00 +0000

I used to doodle and make pixel art on my TI 84+ in high school. I'd spend entire classes just clicking left, right, up, down, and enter to move and toggle individual pixels with a simple program I'd written. https://timstr.website/artwork/ti84plus.html

New comment by alter_igel in "Full Spectrum and Infrared Photography"

alter_igel — Fri, 13 Mar 2026 05:07:32 +0000

Author here. Amazing work! The visible and thermal compositing is done really well and gives back so much detail and context that is lost in purely thermal images.

Does your IR camera give you access to raw temperature data? I've briefly played with a cheap thermal camera and it seemed to assign its own colours varyingly depending on the dynamic range of temperatures in view.

New comment by alter_igel in "Full Spectrum and Infrared Photography"

alter_igel — Fri, 13 Mar 2026 05:02:04 +0000

Author here. I agree with you, "full spectrum" is a generous marketing phrase for what might more accurately be called _extended_ spectrum.

People way smarter than me have been able to achieve DIY spatial imaging with x-rays via compressed sensing [1] and with microwaves via phased arrays [2].

Optical wavelengths seem to be at a sweet spot of good angular resolution, varied natural sources, and harmless to humans.

[1] https://www.youtube.com/watch?v=EuVgGrun1V0

[2] https://www.youtube.com/watch?v=sXwDrcd1t-E

New comment by alter_igel in "Full Spectrum and Infrared Photography"

alter_igel — Fri, 13 Mar 2026 04:55:11 +0000

Author here. Great point about the lens-dependent abberation, I mentioned this briefly in my earlier write-up about doing the full spectrum mod [1] but forgot to mention it by name here. I've been trying to get by without spending a lot of money on lenses and have gotten a lot of mileage out of a cheap used 50mm lens that _feels_ like it's just one or two solid glass elements. Fortunately the old camera mount I'm using means all the lenses for it are used, old, and super cheap secondhand. I'm about to try my luck with a 300mm lens. IR should be fun but we'll see if I can squeeze any UV at all through that.

Beautiful shots you have with your own full spectrum camera. Originally I somewhat dismissed the Kolari IR Chrome filter because the suggested combination with a channel swap and custom LUT felt a little too heavily edited for me and I prefer to stay close to the dry camera signal. The shot with the Tiffen Deep Yellow filter is gorgeous, how does that one look on the camera LCD without the channel swap?

[1] https://timstr.website/blog/diyfullspectrummod.html

Full Spectrum and Infrared Photography

alter_igel — Sun, 08 Mar 2026 16:11:02 +0000

Article URL: https://timstr.website/blog/fullspectrumphotography.html

Comments URL: https://news.ycombinator.com/item?id=47298448

Points: 67

# Comments: 33