Subject: [PATCH 2/2] gnu: Add pngquant.

From: Hartmut Goebel <[email-masked]>
Date: Thu, 11 Jul 2019 22:39:11 +0200

* gnu/packages/image.scm (pngquant): New variable.
---
 gnu/packages/image.scm | 44 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/gnu/packages/image.scm b/gnu/packages/image.scm
index 5a5174354c..bfbf7ea823 100644
--- a/gnu/packages/image.scm
+++ b/gnu/packages/image.scm
@@ -335,6 +335,50 @@ Currently all documentation resides in @file{pnglite.h}.")
 images to 8-bit indexed-color (palette) images.")
    (license license:gpl3)))
 
+(define-public pngquant
+  (package
+   (name "pngquant")
+   (version "2.12.3")
+   (source
+    (origin
+      (method git-fetch)
+      (uri (git-reference
+            (url "https://github.com/kornelski/pngquant.git")
+            (commit version)))
+      (file-name (git-file-name name version))
+      (sha256
+       (base32 "1yiwbcihn4311fpfd568gg8zmmhqwg80jmhbhkb5msiipgd9xv33"))))
+   (build-system gnu-build-system)
+   (arguments
+    `(#:test-target "test"
+      #:configure-flags
+      '("--with-openmp" "--with-lcms2")))
+   (native-inputs
+    `(("pkg-config" ,pkg-config)))
+   (inputs
+    `(("libpng" ,libpng)
+      ("zlib" , zlib)
+      ("lcms" ,lcms)
+      ("libimagequant" ,libimagequant)))
+   (home-page "https://pngquant.org/")
+   (synopsis "Utility and library for lossy compressing PNG images")
+   (description "pngquant is a PNG compressor that significantly reduces file
+sizes by converting images to a more efficient 8-bit PNG format with alpha
+channel (often 60-80% smaller than 24/32-bit PNG files).  Compressed images
+are fully standards-compliant and are supported by all web browsers and
+operating systems.
+
+Features:
+@enumerate
+@item High-quality palette generation using a combination of vector
+      quantization algorithms.
+@item Unique adaptive dithering algorithm that adds less noise to images
+      than the standard Floyd-Steinberg.
+@item Easy to integrate with shell scripts, GUIs and server-side software.
+@item Fast mode for real-time processing/large numbers of images.
+@end enumerate")
+   (license license:gpl3)))
+
 (define-public libjpeg
   (package
    (name "libjpeg")
-- 
2.21.0