commit 474bbee1492c8d06ebb6a9b979b1daa93aa7376d
Author: Peter Rosin <p...@lysator.liu.se>
Date: Tue Jun 16 14:37:04 2009 +0200
Describe the Tight JPEG Quality Level Pseudo-encoding.
Signed-off-by: Peter Rosin <p...@lysator.liu.se>
diff --git a/rfbproto.rst b/rfbproto.rst
index 24aab00..90545a3 100644
--- a/rfbproto.rst
+++ b/rfbproto.rst
@@ -747,7 +747,8 @@ Code Vendor Signature Description
6 "``TRDV``" "``ZLIB____``" `ZLib Encoding`_
7 "``TGHT``" "``TIGHT___``" `Tight Encoding`_
8 "``TRDV``" "``ZLIBHEX_``" `ZLibHex Encoding`_
--32 "``TGHT``" "``JPEGQLVL``" JPEG Quality Level
+-32 "``TGHT``" "``JPEGQLVL``" `JPEG Quality Level
+ Pseudo-encoding`_
-223 "``TGHT``" "``NEWFBSIZ``" `DesktopSize Pseudo-encoding`_ (New
FB Size)
-224 "``TGHT``" "``LASTRECT``" `LastRect Pseudo-encoding`_
@@ -1664,6 +1665,7 @@ Number Name
7 `Tight Encoding`_
8 `zlibhex Encoding`_
16 `ZRLE Encoding`_
+-23 to -32 `JPEG Quality Level Pseudo-encoding`_
-223 `DesktopSize Pseudo-encoding`_
-224 `LastRect Pseudo-encoding`_
-239 `Cursor Pseudo-encoding`_
@@ -1680,7 +1682,8 @@ Number Name
=========================== ===========================================
15 TRLE
17 Hitachi ZYWRLE
--1 to -222 Tight options
+-1 to -22 Tight options
+-33 to -222 Tight options
-225 to -238 Tight options
-240 to -246 Tight options
-257 to -272 Anthony Liguori
@@ -2343,6 +2346,21 @@ are:
Pseudo-encodings
++++++++++++++++
+JPEG Quality Level Pseudo-encoding
+----------------------------------
+
+Specifies the desired quality from the JPEG encoder. Encoding number
+-23 implies high JPEG quality and -32 implies low JPEG quality. Low
+quality can be useful in low bandwidth situations. If the JPEG quality
+level is not specified, **JpegCompression** is not used in the `Tight
+Encoding`_.
+
+The quality level concerns lossy compression and hence the setting is a
+tradeoff between image quality and bandwidth. The specification defines
+neither what bandwidth is required at a certain quality level nor what
+image quality you can expect. The quality level is also just a hint to
+the server.
+
Cursor Pseudo-encoding
-----------------------
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