Add note about needing S key for PNG + compression
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@ -87,7 +87,8 @@ In this format any PNG image can be transmitted directly. For example:
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```
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The PNG format is specified using the `f=100` key. The width and height of
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the image will be read from the PNG data itself.
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the image will be read from the PNG data itself. Note that if you use both PNG and
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compression, then you must provide the `S` key with the size of the PNG data.
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=== Compression
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