Re: CFD: eXIf 2017-05-31

> From: Cosmin Truta <[email protected]>
> Therefore, the PNG encoder may choose: is it going to be a typical
> small standard-sized EXIF with small standard-sized thumbnail? Or is
> it going to be larger-than-standard EXIF with either a
> larger-than-standard thumbnail or a correctly-embedded, with
> correctly-linked internal preview image?
> 
> This is to be decided at encoding time.

Hi Cosmin,

In your model the encoder is making a decision based on implicit knowledge of the decoder's goal.  It is a special case if the encoder has this knowledge.  In the general case the decoder must be the one to make this decision.

I think the text is cleaner when written from the decoder's perspective, and developers reading this should realize that they can simplify their decoder if they have a tightly coupled encoder that writes the Exif in a format compatible with the destination file.

If you can't agree, then maybe the wording can be changed to avoid mentioning either the encoder or decoder.

- Phil
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