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-rw-r--r--thumbnail/thumbnail-spec.sgml9
1 files changed, 9 insertions, 0 deletions
diff --git a/thumbnail/thumbnail-spec.sgml b/thumbnail/thumbnail-spec.sgml
index 2eb1a53..cc6c70c 100644
--- a/thumbnail/thumbnail-spec.sgml
+++ b/thumbnail/thumbnail-spec.sgml
@@ -234,6 +234,15 @@ $XDG_CACHE_HOME/thumbnails/fail/
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>