Raising this more as a "something for the future" but it's related to this
discussion: there's also the WebP format (
https://developers.google.com/speed/webp/ ).
It's probably not suitable for use yet simply because several browsers don't
implement it, and it's still undergoing some development, but from a technical
perspective as best I can tell it offers both lossy and lossless compression,
plus transparency for both types.
The advantage if it ever takes off is that you don't need to use multiple
formats for the "same" content, just a flag for the compression type.
Cheers,
Jonathan
---- On Fri, 10 Jun 2016 12:01:04 +0100 Andrea
Aime<[email protected]> wrote ----
On Fri, Jun 10, 2016 at 1:17 AM, Jody Garnett <[email protected]>
wrote:
What an interesting problem, I don't really mind what format is named as. I
find image/jpeg-png to be clear, but if other software is using image/jpeng it
is worth while to avoid introducing an alternate "standard".
Nah, nobody is using it. The other systems we have seen use "mixed" as a config
parameter, but I don't know what they expose.
Aside: GeoTIFF provides a lot of flexibility in encoding contents, including
JPEG compression. Is it worth dynamically tuning the image/tiff output
compression for the same affect as above?
Unsure... that depends a lot on the user, and GeoTIFF is a different kind of
beast... I would handle it in a different way, allowing
the user to specify what they want like in WCS 2.0, if that machinery gets
built then yes, within that context it would make
a bit more sense to have a way for the user to tell GeoServer to use a "JPEG or
DEFLATE" compression based on whether
there is transparency (but then again, one could argue that in that case it
makes more sense to return a JPEG compressed
image with a binary nodata mask instead... as said, GeoTiff is complicated...)
Cheers
Andrea
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