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Show HN: A luma dependent chroma compression algorithm (image compression)

https://www.bitsnbites.eu/a-spatial-domain-variable-block-size-luma-dependent-chroma-compression-...
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Show HN: I saw this cool navigation reveal, so I made a simple HTML+CSS version

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36•momciloo•5h ago•5 comments

Show HN: Kappal – CLI to Run Docker Compose YML on Kubernetes for Local Dev

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Show HN: Look Ma, No Linux: Shell, App Installer, Vi, Cc on ESP32-S3 / BreezyBox

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292•isitcontent•1d ago•38 comments

Show HN: If you lose your memory, how to regain access to your computer?

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Show HN: I spent 4 years building a UI design tool with only the features I use

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373•vecti•1d ago•170 comments

Show HN: PalettePoint – AI color palette generator from text or images

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Show HN: Smooth CLI – Token-efficient browser for AI agents

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Show HN: I built a <400ms latency voice agent that runs on a 4gb vram GTX 1650"

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Show HN: Stacky – certain block game clone

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3•Keyframe•5h ago•0 comments

Show HN: A toy compiler I built in high school (runs in browser)

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Show HN: Artifact Keeper – Open-Source Artifactory/Nexus Alternative in Rust

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155•bsgeraci•1d ago•64 comments

Show HN: BioTradingArena – Benchmark for LLMs to predict biotech stock movements

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Show HN: Slack CLI for Agents

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Show HN: ARM64 Android Dev Kit

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Show HN: Nginx-defender – realtime abuse blocking for Nginx

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Show HN: Gigacode – Use OpenCode's UI with Claude Code/Codex/Amp

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Show HN: MCP App to play backgammon with your LLM

https://github.com/sam-mfb/backgammon-mcp
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Show HN: Micropolis/SimCity Clone in Emacs Lisp

https://github.com/vkazanov/elcity
173•vkazanov•2d ago•49 comments

Show HN: I'm 75, building an OSS Virtual Protest Protocol for digital activism

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8•sakanakana00•10h ago•2 comments

Show HN: I built Divvy to split restaurant bills from a photo

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3•pieterdy•10h ago•1 comments

Show HN: Horizons – OSS agent execution engine

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Show HN: Daily-updated database of malicious browser extensions

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14•toborrm9•1d ago•8 comments

Show HN: Falcon's Eye (isometric NetHack) running in the browser via WebAssembly

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Show HN: Slop News – HN front page now, but it's all slop

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Show HN: I Hacked My Family's Meal Planning with an App

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2•melvinzammit•12h ago•0 comments

Show HN: Which chef knife steels are good? Data from 540 Reddit tread

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Show HN: I built a free UCP checker – see if AI agents can find your store

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Show HN: Local task classifier and dispatcher on RTX 3080

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25•Shubham_Amb•1d ago•2 comments
Open in hackernews

Show HN: Weather2Geo – Geolocate screenshots from weather widgets

https://github.com/elliott-diy/Weather2Geo
54•Elliott-Diy•8mo ago
Hi HN,

I built an OSINT tool called Weather2Geo that helps locate where a screenshot was taken based on the weather widget data visible (e.g. temp, condition, and local time in the taskbar). People often post these without realizing how specific those values can be in combination.

It works by comparing the given weather condition, temperature, and time against current data from thousands of cities. It’s timezone-aware, supports fuzzy matching, and groups results geographically to reduce noise.

It’s most effective on recent screenshots, ideally taken within the last hour—since weather and daylight conditions change quickly.

The tool helps pinpoint likely locations when screenshots lack EXIF data or other traditional OSINT clues.

It’s open source here: https://github.com/elliott-diy/Weather2Geo

Would love feedback, bug reports, or to hear if you think this has other use cases.

- Elliott

Comments

progbits•8mo ago
Do you plan to scrape the data and maintain a historical database so old screenshots can be used too?

Would be really cool but I imagine it could be difficult to get past rate limits.

Elliott-Diy•8mo ago
That’s actually an end goal! I’m thinking of setting up a system to crowdsource this: if people opt in, the tool could cache the weather data it pulls and share it to help build a distributed historical dataset.
tgv•8mo ago
There are meteorological services with open data access: https://www.ncei.noaa.gov/cdo-web/, https://english.knmidata.nl/open-dat, https://climatedataportal.metoffice.gov.uk/

Mapping that would be quite a bit of work, I imagine.

Elliott-Diy•8mo ago
Yeah, mapping it would definitely be a project. I looked into using open data from those sources, but ran into issues where the values didn’t match what MSN reports (which is what the Windows weather widget uses). Even small differences in temperature or how conditions are worded ("partly sunny" vs. "mostly sunny") can throw off the match. I’m planning to try using open data for historical screenshots eventually, but I expect it’ll reduce accuracy greatly.
rconti•8mo ago
Using a time series database would be great here.
landgenoot•8mo ago
I think you can parse the date and time format as well to shrink your problem space.

https://en.m.wikipedia.org/wiki/List_of_date_formats_by_coun...

Elliott-Diy•8mo ago
That's a great idea. I'll see how I can add this in today!
antman•8mo ago
I would assume you need to add your time and location at the time of the screenshot also so that you can correct the remote displayed time to Microsoft Weather time?
Elliott-Diy•8mo ago
Yep! The tool currently only works with screenshots taken within the past hour, since that's the only weather data I have access to right now. It also relies on having a consistent reference point for time. When you run the script, it uses your current timezone to help align the time shown in the screenshot with Microsoft Weather's data.