[ANN] Guile-PNG 0.4.1 released

[Artyom V. Poptsov]

Hello Guilers,

I'm pleased to announce Guile-PNG 0.4.1, Portable Network Graphics
(PNG)[1] library for GNU Guile, implemented in pure scheme:
  https://github.com/artyom-poptsov/guile-png/releases/tag/v0.4.1

This release includes several bugfixes and adds an image processing
procedure that converts a PNG image to grayscale colors.


* List of user-visible changes

--8<---------------cut here---------------start------------->8---
* Changes in version 0.4.1 (2023-05-06)
** Bugfix: =png-image-clone= now clones image data
=png-image-clone= now produces full clone of the image data as expected.
** Bugfix: =png-chunk-clone= now clones chunks properly
Now =png-chunk-clone= creates correct copies of pHYs, tIME, tEXt, tEXT and
zTEXt chunks.
** New procedure: =png-image-filter-grayscale=
This procedure allows to convert image to grayscale colors.
--8<---------------cut here---------------end--------------->8---


Happy hacking!

- Artyom


References:
1. https://www.rfc-editor.org/rfc/rfc2083

-- 
Artyom "avp" Poptsov <poptsov.artyom@gmail.com>
Home page: https://memory-heap.org/~avp/
CADR Hackerspace co-founder: https://cadrspace.ru/
GPG: D0C2 EAC1 3310 822D 98DE  B57C E9C5 A2D9 0898 A02F

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