Add note about needing S key for PNG + compression

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Kovid Goyal 2017-10-04 23:25:27 +05:30
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@ -87,7 +87,8 @@ In this format any PNG image can be transmitted directly. For example:
``` ```
The PNG format is specified using the `f=100` key. The width and height of The PNG format is specified using the `f=100` key. The width and height of
the image will be read from the PNG data itself. the image will be read from the PNG data itself. Note that if you use both PNG and
compression, then you must provide the `S` key with the size of the PNG data.
=== Compression === Compression