PR created: https://github.com/apache/commons-imaging/pull/294


Note that simply running 'mvn' after a clean checkout of 'master' fails on 
JavaDoc generation for 'PhotometricInterpreterPalette',

as none of the parameters have JavaDoc.



Jeroen.

________________________________
From: Gary Gregory <garydgreg...@gmail.com>
Sent: Tuesday, May 23, 2023 1:52:14 PM
To: Commons Developers List
Subject: Re: [imaging] Allow custom PaletteFactory for writing PNG files.

Jeroen,

That sounds interesting.
Feel free to create a PR on GitHub.

Gary

On Tue, May 23, 2023, 05:59 Vegt, Jeroen van der
<j.van.der.v...@nfi.nl.invalid> wrote:

> Hi,
>
>
>
> I'm using Apache Commons Imaging to generate 8 bit (indexed) PNG files.
> Unfortunately, there doesn't seem to be way to supply a custom color
> palette. In particular, I'd like to use Wu's color quantization algorithm,
> https://gist.github.com/bert/1192520.
>
>
> Would a patch or PR allowing an (optional) custom PaletteFactory to
> PngWriter.writeImage()<
> https://github.com/apache/commons-imaging/blob/master/src/main/java/org/apache/commons/imaging/formats/png/PngWriter.java#L324>
> be welcome? I can then supply my own version of the PaletteFactory, but
> introducing an interface would be even cleaner I suppose.
>
>
>
> Kind regards,
>
>
> Jeroen.
>
>
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