Add note about needing S key for PNG + compression

This commit is contained in:
Kovid Goyal
2017-10-04 23:25:27 +05:30
parent 75244b1416
commit e8f72c90f3

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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 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