[gimp] NEWS: mention CIE Lab gradient blending

[Øyvind Kolås <ok src gnome org>]

commit 27d75a5bd0027e33521aedee7971ad7c76a2649c
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Apr 17 21:24:08 2018 +0200

    NEWS: mention CIE Lab gradient blending

 NEWS |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/NEWS b/NEWS
index 9bdd91c..eee7d32 100644
--- a/NEWS
+++ b/NEWS
@@ -66,9 +66,9 @@ Tools:
 
   - Color used in the Smudge tool is now added to the color history.
   - "Blend" tool renamed to much more consistent "Gradient" tool.
-    Also it can now work in linear color space, thus making sure you
-    have way more even transitions and getting rid of some bad color
-    interpolation.
+    Also it can now work in linear RGB matching capabilities CSS/SVG
+    specification without gamma-errors in color blending and CIE Lab
+    which in addition keeps a perceptual graylevel.
 
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