[PATCH] specify that orientation metadata should be respected

[Michael J. Chudobiak]

---
 thumbnail/thumbnail-spec.sgml |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/thumbnail/thumbnail-spec.sgml b/thumbnail/thumbnail-spec.sgml
index 091b5d1..cb539b6 100644
--- a/thumbnail/thumbnail-spec.sgml
+++ b/thumbnail/thumbnail-spec.sgml
@@ -223,6 +223,15 @@
         possible quality when creating the thumbnail. The exact meaning of this
         is left to the specific program but it should consider applying
         antialiasing.</para>
+
+     <para>If the original file contains metadata affecting the interpretation
+        of the image, it should be respected as much as possible. In particular,
+        metadata specifying the orientation of the original image data should 
+        always be respected. The image data should be transformed as specified by the 
+        metadata before generating the thumbnail. JPEG files commonly have Exif 
+        orientation tags. TIFF files may also have Exif orientation tags, although
+        this is less common. It is less critical, but still desirable, to respect
+        other image metadata, such as white balance information.</para>
      </sect2>
 
      <sect2 id="addinfos"><title>Thumbnail Attributes</title> 
-- 
1.7.7.6


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