Re: EXIF support in PNG

I found it (in the spec) it is probably the "Recording Format" that 
needs to get a new value to allow for PNG compression

it also mentions the "Information Format" tag in the TIFF headers



On 2017-01-01 14:18, Willem van Schaik wrote:
>
> folks, didn't see any responses on two issues I raised yesterday (or did
> I miss it somehow ?)
>
>
> #1 - we have to solve this!!
> looking at the EXIF metadata in eog, I noticed that one of the markers
> is "Compression" so maybe is a need for a change in the EXIF standard,
> namely to add "PNG Compression" (I'm talking here about the main
> picture, not the thumbnail)
>
> it is probably tag #103 on page 28 of the JEITA/CIPA spec - or is that
> only for the thumbnail, anyway when the mail image is stored as PNG
> instead of JPEG, that must be reflected in the EXIF data
>
>
> #2 - of lesser importance
> we could always request the CIPA folks to add in the EXIF standard PNG
> as a fourth compression method for thumbnails; which wouldn't require
> any change to the PNG standard, because from a PNG perspective we
> consider the EXIF chunk a "black box"
>
>
> Willem
>
>


-- 

Willem van Schaik
<[email protected]>
http://www.schaik.com/


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