New LightZone Release (4.2)

Just thought I’d make people aware that the LightZone photo editing software is not dead and is still under development.

The website appeared to have gone dark and there had been quite a big gap since the last release of the software.

It now appears that the person that was looking after the site (Tex) is back on the scene after being seriously tied up with work for an extended period of time and the developer Masahiro has released version 4.2 which among other things has added lens correction using Lensfun.

This post on the LightZone contains the link to download the latest version of the software:

I think that its a piece of software that’s worth having around - it just needs a bit more love and maybe the developer could do with a hand (at the moment I think there’s only one).

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If, and that means only if, Lightzone will allow downloads without registering, I would give a helping hand for optimisations as I did for LuminanceHdr, Filmulator and Siril.


I’ve just nipped back onto the LightZone site and posted a comment to make them aware of your offer of a helping hand (and the condition of allowing downloads without registering).

I’d agree that the registration to download policy is counter productive and alienates both users and potential developers.

I have no connection with the developer nor am I anything to do with running that LightZone website so I have no influence over them - I’m just an interested bystander.

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The Dariusz Duma website has information about the repository.

Understandable, I see literally no reason for them to collect user information. Their explanation seems misguided:

“We are requiring membership for security purposes, to better track the downloads, and to help build the community in order to attract developers and improve the knowledge base.”

That’s all nonsense to me…


Agreed. There would be many more downloads if they weren’t forced to be tracked. And there would be more people to build a community around as a result. They’re (sadly) self-limiting all that with their registration.

Hello. Note that LightZone is written in Java. This means that low-level optimisation is much harder, as machine code is only generated at runtime, and the toolset (profiler etc) is also different from the C/C++ projects. Some excellent sites on the topic are (unfortunately, not updated for a long time) and (has lots of info, including analysis of the generated machine code).

Some of the challenges are also different (e.g. user experience may be bad due to producing too much garbage, and/or a badly tuned garbage collector).