Document Futatabi white balance.

diff --git a/futatabi.rst b/futatabi.rst
index 8d9f1a02f7a1a539e7d96a9f25368fbe2f7e71b0..af615963f879d7f398ca631c1a1d887ddb57b17c 100644 (file)
--- a/futatabi.rst
+++ b/futatabi.rst
@@ -201,6 +201,16 @@ hear any audio, unless they use a video player into the Futatabi stream locally
 (with associated delay). All of this may change in the future.
 
 
+White balance
+'''''''''''''
+
+Since version 1.9.2, Futatabi will integrate with Nageru for white balance;
+the white balance set in Nageru will be recorded, and properly applied on
+playback (including fades). Note that this assumes you are using the built-in
+white balance adjustment (new in 1.9.2), not adding WhiteBalanceEffect manually
+to the scene; see :ref:`white-balance` for an example.
+
+
 Replay workflows
 ----------------
 
@@ -324,6 +334,10 @@ In particular:
     the actual RGB color space; Nageru assumes it is Rec. 709, like for capture
     cards, but the differences between 601 and 709 here are small. sRGB gamma
     is assumed throughout, like in JFIF.)
+  * The white balance (gray point) is stored in a minimal EXIF header,
+    and echoed back for original and interpolated frames. (During fades, Futatabi
+    applies white balance itself, and does not require gray point adjustment
+    from the client.)
 
 Many players may also be confused by the fact that the resolution can change
 from frame to frame; this is because for original (uninterpolated) frames,