Dirk Lemstra πŸ§™β€β™‚οΈ's Avatar

Dirk Lemstra πŸ§™β€β™‚οΈ

@dirk.lemstra.org

Open source maintainer of @imagemagick.org and its .NET Standard/Framework library called Magickβ€€NET. Microsoft #MVP | GitHub ⭐ πŸ‡³πŸ‡± https://github.com/dlemstra πŸ’–πŸ‡ΉπŸ‡Ό

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Latest posts by Dirk Lemstra πŸ§™β€β™‚οΈ @dirk.lemstra.org

YubiKey screenshot of signed commits.

YubiKey screenshot of signed commits.

I sign all my @github.com commits with an @yubico.com #Yubikey. It took me around 4 and half years but I finally hit 10.000:

24.02.2026 21:50 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
XKCD dependency image about ImageMagick

XKCD dependency image about ImageMagick

I can finally share that @imagemagick.org was part of the @github.com Secure Open Source Fund in September of last year πŸ§™β€β™‚οΈπŸ₯‚πŸŽ‰πŸ€©β­.

You can read all about it here: www.linkedin.com/feed/update/... and here: github-stories.com/2026/imagema...

17.02.2026 20:24 πŸ‘ 14 πŸ” 3 πŸ’¬ 1 πŸ“Œ 1

It has been released and fixed! Thanks so much for your help to get this fixed πŸŽ‰πŸ₯‚πŸ§™β€β™‚οΈ

15.02.2026 17:31 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
GitHub Stars 2026 award banner with Octocat mascot inside a gold star celebrating a developer's recognition.

GitHub Stars 2026 award banner with Octocat mascot inside a gold star celebrating a developer's recognition.

Yesterday was a crazy day, first I received the news that I successfully cleared my Germany A1 exam and after few hours I received the news I AM GITHUB STAR FOR 2026, ONE of the 80+ developers from 180 million developers on GitHub to get this recognition 😍

04.02.2026 03:42 πŸ‘ 25 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0
GitHub Stars 2026 Award

GitHub Stars 2026 Award

here we are again!

feeling proud

03.02.2026 18:12 πŸ‘ 50 πŸ” 2 πŸ’¬ 6 πŸ“Œ 1
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Still can’t quite believe this, but it’s official
I’ve been renewed as a @GitHub.com Star for 2026

Out of 180+ million developers on GitHub, only ~80 people worldwide are part of this program. Being renewed means a lot; it’s a reminder that the work we do in open source, education actually matters

03.02.2026 18:20 πŸ‘ 10 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0
We’re thrilled to let you know that you have been chosen to be a GitHub Star for 2026. Thank you for all your continued work and dedication to supporting and influencing the entire GitHub community over the past 12 months!

You are one of 80+ amazing GitHub Stars selected from the community of over 180+ million developers on GitHub! From creating content to giving us feedback to educating and sharing with your communities as they grow, you've played a tremendous role in helping users keep up with the rapid pace of change, and you’ve continued to be a shining light for many. Thank you for your passion to inspire, educate, and grow the community.

We’re thrilled to let you know that you have been chosen to be a GitHub Star for 2026. Thank you for all your continued work and dedication to supporting and influencing the entire GitHub community over the past 12 months! You are one of 80+ amazing GitHub Stars selected from the community of over 180+ million developers on GitHub! From creating content to giving us feedback to educating and sharing with your communities as they grow, you've played a tremendous role in helping users keep up with the rapid pace of change, and you’ve continued to be a shining light for many. Thank you for your passion to inspire, educate, and grow the community.

I'm a GitHub Star again in 2026 ⭐
5 years now😎!

This recognition reflects the awesome communities I work with every day: generous and talented people who share knowledge, build in the open, and support each other’s growth.

Thanks to @github.com and to the communities I learn from & contribute to.

03.02.2026 18:21 πŸ‘ 22 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
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Grateful for this recognition and the amazing open source community that makes it all possible. Thank you @github.com for this incredible acknowledgment!
Looking forward to continuing to contribute, share, and build together.

#GitHubStars #OpenSource #DeveloperCommunity

03.02.2026 18:32 πŸ‘ 12 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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Very happy to share that I’ve been renewed as a @github.com Star for the third consecutive year!

Huge thanks to the GitHub team and to everyone in the community who’s supported and collaborated with me along the way βœ…

#GitHubStar #Community #OpenSource #DevOps #PlatformEngineering #Azure #GitHub

03.02.2026 18:35 πŸ‘ 8 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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I have been renewed as a GitHub Star β­πŸ€©πŸŽ‰πŸ₯‚πŸ§™β€β™‚οΈ Really happy that I can be part of this amazing community for another year! | πŸ§™β€β™‚οΈDirk Lemstra I have been renewed as a GitHub Star β­πŸ€©πŸŽ‰πŸ₯‚πŸ§™β€β™‚οΈ Really happy that I can be part of this amazing community for another year!

I have been renewed as a @github.com Star β­πŸ€©πŸŽ‰πŸ₯‚πŸ§™β€β™‚οΈ

www.linkedin.com/posts/dirk-l...

03.02.2026 18:44 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

If you are also here at #FOSDEM and want to meet up then feel free to send me a dm.

31.01.2026 10:58 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
thank you, magick-wasm is great Β· dlemstra magick-wasm Β· Discussion #259 just wanted to say "thank you" this utility has been great for me over the last year or two since I found it.

Always nice to receive these kind of nice posts: github.com/dlemstra/mag...

30.01.2026 21:38 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Achtergrond - Google is om: waarom JPEG XL alsnog de standaard voor het web wordt JPEG XL lijkt eindelijk brede adoptie op het web tegemoet te gaan. Tweakers spreekt grondlegger Jon Sneyers over de superieure techniek en de toekomst.

JPEG XL lijkt eindelijk brede adoptie op het web tegemoet te gaan. Tweakers spreekt grondlegger Jon Sneyers over de superieure techniek en de toekomst. #Tweakers

20.01.2026 05:22 πŸ‘ 10 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
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Release Magick.NET 14.10.2 Β· dlemstra/Magick.NET Related changes in ImageMagick since the last release of Magick.NET: Check if the aspect ratio is a known ratio when density_unit is set to zero and otherwise read it as an undefined density in th...

Published Magick.NET 14.10.2 for .NET Standard 2.0 and .NET 8.0: github.com/dlemstra/Mag.... The NuGet packages can be found here: nuget.org/packages?q=M....

19.01.2026 21:59 πŸ‘ 6 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Looking for examples: do you know any OSS projects that have thoughtfully updated their contribution process for AI-assisted PRs?

Interested in:
* PR templates asking for intent/reasoning
* Comprehension checks
* Other friction-adding methods

Would love to learn from communities experimenting here

16.01.2026 02:48 πŸ‘ 8 πŸ” 11 πŸ’¬ 2 πŸ“Œ 0
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Release Magick.NET 14.10.1 Β· dlemstra/Magick.NET Related changes in ImageMagick since the last release of Magick.NET: Only allow setting the data_precision to values other then 16 and 12 when quality is lossless (>= 100) in the jpeg coder. Rever...

Published Magick.NET 14.10.1 for .NET Standard 2.0 and .NET 8.0: github.com/dlemstra/Mag.... The NuGet packages can be found here: nuget.org/packages?q=M....

30.12.2025 07:58 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I didn't order mine instantly so now I need to wait till the end of January before I get it... It looks awesome!

21.12.2025 07:49 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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I can finally share that the European Commission sponsored a bug bounty program for the ImageMagick Studio LLC library! Looking forward to the reports that will make our product more secure πŸŽ‰πŸ§™β€β™‚οΈ | πŸ§™β€... I can finally share that the European Commission sponsored a bug bounty program for the ImageMagick Studio LLC library! Looking forward to the reports that will make our product more secure πŸŽ‰πŸ§™β€β™‚οΈ

We launched a bug bounty program for @imagemagick.org that is sponsored by the European Commission on YesWeHack: www.linkedin.com/feed/update/...

20.12.2025 10:15 πŸ‘ 6 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

I will probably get an answer that he won't remember πŸ˜‰

19.12.2025 15:59 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I really don't understand how past me thinks that future me still knows what that e-mail reminder with just a topic would mean. I hope that future me will remember to add more details in such a reminder...

19.12.2025 09:49 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Release Magick.NET 14.10.0 Β· dlemstra/Magick.NET What's Changed Allow specifying the pdf format in the constructor of the PdfWriteDefines (#1931). Added HighBitDepth to the JpegWriteDefines. Related changes in ImageMagick since the last release...

Published Magick.NET 14.10.0 for .NET Standard 2.0 and .NET 8.0: github.com/dlemstra/Mag.... The NuGet packages can be found here: nuget.org/packages?q=M....

10.12.2025 16:44 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Ever thought a harmless pull request comment could execute code in your CI? I disclosed a workflow vulnerability where untrusted PR comments enabled command execution with repo write permissions. In… ... Ever thought a harmless pull request comment could execute code in your CI? I disclosed a workflow vulnerability where untrusted PR comments enabled command execution with repo write permissions. In m...

Another story: www.linkedin.com/posts/dirk-l.... A story of exploiting PR comment handling in GitHub Actions to achieve command execution, followed by disclosure, remediation, and practical workflow hardening guidance.

22.11.2025 11:14 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Thanking myself for leaving a breaking build so I know where I should start today... I really did not forget what I was doing 🀫

17.11.2025 07:58 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Screenshot of account sign in types in Visual Studio

Screenshot of account sign in types in Visual Studio

When you are installing the new @visualstudio.com 2026 and you get stuck in some sign in loop then switch to the "Embedded web browser" instead of the "Windows authentication broker". The 2026 installation did not seem to remember that setting from the 2022 installation.

16.11.2025 08:49 πŸ‘ 3 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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#wasm | πŸ§™β€β™‚οΈDirk Lemstra The magick-wasm npm package now uses Trusted Publisher Starting with version 0.0.37 of the ImageMagick Studio LLC #WASM package it is now published automatically on GitHub by using the new Trusted Pu...

Last week I wrote a short story about how I configured my @imagemagick.org #WASM to use Trusted Publishing: www.linkedin.com/feed/update/...

13.11.2025 15:11 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Hack.Commit.Push Switzerland is just one week away! πŸ‡¨πŸ‡­

This is a great opportunity to get involved in Open Source projects like @assertj.github.io, with direct guidance from the maintainers!

13.11.2025 10:30 πŸ‘ 7 πŸ” 8 πŸ’¬ 0 πŸ“Œ 0

Guess I can delay it and switch to macos-15-intel for now.

05.11.2025 16:40 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

#AdventOfCode 2025 sponsorship is now open! If your organization might be interested in sponsoring, please have them email sponsorship at [the Advent of Code domain name]. adventofcode.com/2025/sponsors

04.11.2025 03:35 πŸ‘ 53 πŸ” 14 πŸ’¬ 1 πŸ“Œ 0
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Release 0.0.37 Β· dlemstra/magick-wasm Changes in magick-wasm: Added roll to MagickImage. Library updates: ImageMagick 7.1.2-8 (2025-10-26) aom 3.13.1 (2025-09-05) exr 3.4.2 (2025-10-16) freetype 2.14.1 (2024-09-11) imath 3.2.2 (2025...

Just published version 0.0.37 of the @imagemagick.org #WASM library (npmjs.com/package/@ima...) that includes the following changes: github.com/dlemstra/mag...

This was published with Trusted Publisher. You can read more about that here: dlemstra.github.io/github-stori...

03.11.2025 07:48 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Release Magick.NET 14.9.1 Β· dlemstra/Magick.NET What's Changed Related changes in ImageMagick since the last release of Magick.NET: GHSA-wpp4-vqfq-v4hp Library updates: ImageMagick 7.1.2-8 (2025-10-28) openexr 3.4.2 (2025-10-16) gdk-pixbuf 2....

Published Magick.NET 14.9.1 for .NET Standard 2.0 and .NET 8.0: github.com/dlemstra/Mag.... The NuGet packages can be found here: nuget.org/packages?q=M....

01.11.2025 07:23 πŸ‘ 8 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0