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Jonas Wagner - 29a.ch

29a.ch by Jonas Wagner · 29a.ch · English

29a.ch is the personal website of Jonas Wagner.

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Apr 12, 2025
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  1. C2PA Content Credential Photo Forensics
    Apr 12, 2025 · original
    pa href="https://29a.ch/photo-forensics/#c2pa"img src="https://29a.ch/images/screenshot.cache-d9bdbdc89b65d0a1.png" alt="Screenshot C2PA Photo Forensics in Forensically" loading="lazy" C2PA Photo Forensics in Forensically/a/p pI have added support for reading C2PA metadata to my photo forensics tool a href="https://29a
  2. Impulse Response Creator
    Mar 23, 2025 · original
    pa href="https://29a.ch/impulse-response-creator/"img src="https://29a.ch/images/screenshot1.cache-1730bcb90a065dce.png" alt="Screenshot of Impulse Response Creator" loading="lazy" Impulse Response Creator/a/p pI got a little bit obsessed with convolution reverb and measuring impulse responses over the last few weeks.
  3. Tuning Songs Instead of My Guitar
    Nov 17, 2024 · original
    pa href="https://29a.ch/fix-tuning/"img src="https://29a.ch/images/screenshot1.cache-9f4b653520c29308.png" alt="Screenshot of Fix Tuning" loading="lazy" Try Fix Tuning/a/p pIn 1834 Johann Heinrich Scheibler recommended using 440 Hz as the standard frequency for Asub4/sub. For various reasons a lot of music deviates fro
  4. simplex-noise.js 4.0 & Synthwave Demo
    Jul 23, 2022 · original
    pa href="https://29a.ch/sandbox/2022/simplex-noise-synthwave/"img src="https://29a.ch/images/screenshot.cache-b273f7f0381676d8.jpg" alt="Screenshot of the demo" loading="lazy" View the synthwave demo/a/p pI’ve just released version 4.0 of a href="https://github.com/jwagner/simplex-noise.js"simplex-noise.js/a. Ba
  5. Tool to apply wood textures to 3d prints
    Oct 23, 2021 · original
    pa href="https://29a.ch/sandbox/2021/3d-print-texturizer/"img src="https://29a.ch/images/screenshot.1c4874b8.cache-ceca442b7893a1d7.jpg" alt="Screenshot" loading="lazy" Test the 3d print texturizer/a/p pA little while ago I came across an interesting a href="https://www.reddit.com/r/3Dprinting/comments/q2qgfw/today_i_l
  6. Swirly Bokeh Lens Hood - 3D Printed
    Sep 19, 2021 · original
    pa href="https://29a.ch/2021/09/19/swirly-bokeh-lens-hood-3d-printed/./swirl.jpg"img src="https://29a.ch/images/swirl.cache-30e06ec4d8cb637c.jpg" alt="Sample Shot" loading="lazy"/a emPhoto taken with the 3d printed swirly lens hood./em/p pI enjoy the swirly blur in the out of focus regions that certain lenses like the
  7. Procedural Lamp Shades for 3D Printing
    Aug 22, 2021 · original
    pa href="https://29a.ch/sandbox/2021/lampshades/"img src="https://29a.ch/images/screenshot.cache-9e3149fb1e8c3554.jpg" alt="Screenshot" loading="lazy" Play with generating lamp shades/a/p pI didn’t have any lamp shades in my appartment since moving out from my parents place. I’ve decided to change that an
  8. I made myself a guitar tuner
    Apr 20, 2020 · original
    pI first learned about the fourier transform at about the same time I started to play guitar. So obviously the first idea that came to my mind at that time was to build a tuner to tune my new guitar. While I eventually got it to work the accuracy was terrible so it never ended up seeing the light of the day./p pa href=
  9. Lap Timer and Analyser for GoPro Videos
    Dec 31, 2019 · original
    pDuring the past two years I’ve had the occasional pleasure of riding my motorcycles on race tracks. While I’m still far away from being fast I really enjoy working on my riding./p pThis led me to considering different data recording and analysis solutions. A bit down the line I realized that the GoPro ca
  10. I made myself a noise generator
    Aug 25, 2019 · original
    pIt’s been a while since the last release but I finally finished something again./p pNoise tends to eject me from my focus and flow and sometimes noise canceling headphones just aren’t enough to prevent it. In those instances I often mask the remaining noise with less distracting pure noise./p pThere alre
  11. Urban Astrophotography
    Jun 25, 2017 · original
    pa href="https://29a.ch/2017/06/22/urban-astrophotography/cover.jpg"img src="https://29a.ch/images/cover.cache-a2b12f879b6b6b02.jpg" alt="Milkyway Core over Zurich" loading="lazy"/a smallThe milkyway core over Zurich./small/p pOne of the first lessons in astrophotography is that you better find a dark place, far away f
  12. JPEG Forensics in Forensically
    Feb 5, 2017 · original
    pIn this brave new world of alternative facts the people need the tools to tell true from false./p pimg src="https://29a.ch/images/screenshot.cache-b4b3e4f0dfd26b7f.png" alt="screenshot" loading="lazy"/p pWell either that or maybe I was just playing with JPEG encoding and some of that crossed over into my little a href
  13. Principal Component Analysis for Photo Forensics
    Aug 11, 2016 · original
    pAs mentioned earlier I have been playing around with a href="https://en.wikipedia.org/wiki/Principal_component_analysis"Principal Component Analysis/a (PCA) for photo forensics. The results of this have now landed in my a href="https://29a.ch/photo-forensics/#pca"Photo Forensics Tool/a./p pIn essence emPCA/em offers a
  14. Ditherlicious - 1 Bit Image Dithering
    Aug 4, 2016 · original
    pWhile experimenting with a href="https://29a.ch/2016/07/08/black-white-photo-pca"Black and White Conversion using PCA/a I also investigated dithering algorithms and played with those. I found that a href="https://en.wikipedia.org/wiki/Dither#Algorithms"Stucki Dithering/a would yield rather pleasant results. So I creat
  15. Black and White Conversion using PCA
    Jul 8, 2016 · original
    pI have been hacking on my a href="https://29a.ch/photo-forensics/"photo forensics tool/a lately. I found a a href="http://www.cs.dartmouth.edu/farid/downloads/tutorials/digitalimageforensics.pdf"few/a a href="https://www.hackerfactor.com/papers/bh-usa-07-krawetz-wp.pdf"references/a that suggested that performing a hre
  16. Smartcrop.js 1.0
    Jun 25, 2016 · original
    pa href="https://github.com/jwagner/smartcrop.js"img src="https://29a.ch/images/smartcrop.cache-3f210c1682f6805b.jpg" alt="smartcrop illustration" loading="lazy"/a/p pI’ve just released version 1.0 of a href="https://github.com/jwagner/smartcrop.js"smartcrop.js/a. Smartcrop.js is a javascript library I wrote to
  17. Normalmap.js Javascript Lighting Effects
    Mar 13, 2016 · original
    pimg src="https://29a.ch/images/logo.cache-f0dd4799a7b9f26c.png" alt="Logo" loading="lazy" Back in 2010 I did a a href="https://29a.ch/2010/3/24/normal-mapping-with-javascript-and-canvas-tag"little experiment/a with a href="http://wiki.polycount.com/wiki/Normal_map"normal mapping/a and the canvas element. The normal ma
  18. Let's encrypt 29a.ch
    Dec 28, 2015 · original
    pI migrated this website HTTPS using certificates by a href="https://letsencrypt.org/"Let’s Encrypt/a. This has several benefits. The one I’m most excited about is being able to use a href="http://www.html5rocks.com/en/tutorials/service-worker/introduction/"Service Workers/a to provide offline support for
  19. Play it Slowly
    Dec 22, 2015 · original
    pPlay it Slowly is a software to play back audio files at a different speed or pitch. It does also allow you to loop over a certain part of a file. It's intended to help you learn or transcribe songs. It can also play videos thanks to gstreamer. Play it slowly is intended to be used on a GNU/Linux system like Ubun
  20. Time Stretching Audio in Javascript
    Dec 6, 2015 · original
    pSeven years ago I wrote a piece of software called a href="//29a.ch/playitslowly"Play it Slowly/a. It allows the user to change the speed and pitch of an audio file independently. This is useful for example for practicing an instrument or doing transcriptions./p pNow I created a new web based version of emPlay it Slow

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