[babl] docs: add a couple of entries to glossary

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

commit 974571f58f7f9071a413698786bdd354a587282c
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Jul 24 18:00:56 2019 +0200

    docs: add a couple of entries to glossary

 docs/Glossary-static.html | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/docs/Glossary-static.html b/docs/Glossary-static.html
index b10108e..392c604 100644
--- a/docs/Glossary-static.html
+++ b/docs/Glossary-static.html
@@ -59,8 +59,15 @@ configured accuracy is returned and cached for subsequent requests.</dd>
     <dd>In babl a model describes a specific family of color encodings - with its list of color components. 
For the RGB and Grayscale spaces, the model also specifies any nonlinearities as TRCs.</dd>
 
     <dt><a name='CIE' href='#CIE'>CIE</a></dt>
+
     <dt><a name='ICC_profile' href='#ICC_profile'>ICC Profile</a></dt>
-    <dt><a name='encoding' href='#encoding'>Encoding</a></dt>
+    <dd>A blob/file format from the International Color Consortium, that can be used for specifies RGB or 
CMYK color spaces, babl has support for v2 and v4 RGB matrix profiles, as well as support for CMYK based 
profiles by using LCMS2.</dd>
+
+    <dt><a name='encoding' href='#encoding'>Encoding</a>In babl, the encoding
+refers to the part of a bablformat comprised by model, and choice and order of
+components + data type. In other words all the aspects of the format apart from
+the BablSpace. A babl format can be recreated from its encoding and - for
+relevant spaces - the ICC profile for the space.</dt>
 
     <dt><a name='luminance' href='#luminance'>Luminance</a></dt>
     <dd>The photometric measure of luminious intensity of per unit area of light. The luminance in babl is 
proportional to luminance - though it doesn't use the SI unit of candela per square meter.</dd>