[gegl] NEWS: update

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 17d4571bcd23d57e79fe710edb333a3e64d69bcc
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Jul 20 18:25:31 2018 +0200

    NEWS: update

 docs/NEWS.txt | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/docs/NEWS.txt b/docs/NEWS.txt
index 946a62fb0..a07b0ce77 100644
--- a/docs/NEWS.txt
+++ b/docs/NEWS.txt
@@ -15,16 +15,19 @@ As a color management workflow for scene-referred imaging the above could be suf
 
 Since babl 0.1.32 of october 2017, all babl formats have an associated
 unchangable space associated with it, and since then GeglBuffer has worked
-correctly with it - since GeglBuffers use of babl API did not change, it has
-taken until the last month however to come up with a full plan for the rest of
-GEGL. GIMP is already using these parts of babl for ICC matrix based
-conversions since it is an order of magnitude faster than the lcms2 library for
-this.
+correctly with it - since GeglBuffers use of babl API did not change.  GIMP is
+already using these parts of babl for ICC matrix based conversions since it is
+an order of magnitude faster than the lcms2 library for this.  It took time to
+come up with the above scheme of integrating arbitrary primaries and curves for
+spaces with babl, and it has taken until the last month to come up with a full
+plan for the rest of GEGL to be aware of and handling arbirary parametric
+ICC v2/v4 based color spaces for operations.
 
 A space can be constructed from a preferenced name/specification, loaded/saved
 from ICC matrix profiles or constructed and serialized to whitepoint + rgb
 chromaticities / xyz matrix. More recently an additional trc mark has been
-added '~', giving this vocabulary for RGB formats:
+added '~', giving this vocabulary for RGB formats, in addition to variants with
+alpha and pre-multiplied alpha variants of the same:
 
  "RGB"     linear      primaries from space, linear data
  "R'G'B'"  non-linear  primaries from space, TRCs from space