I'm writing web software for a photograph gallery. I want to be able
to display selective fields from the EXIF data. I thought I would be
able to use the GD and exif libraries from Hackage to do
this. However:

Calling Graphics.GD.loadJpegByteString followed by
Graphics.GD.saveJpegFile does not preserve the EXIF fields of the
uploaded file, but instead writes some new ones (many fewer fields
than the original, and nothing of interest).

Graphics.Exif.allTags shows an interesting subset of the original EXIF
data, but nothing from the version saved by GD.

Can anyone shed any light on any of this?
-- 
Colin Adams
Preston Lancashire
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