[QGIS-Developer] webp for qgis server ?
Matthias Kuhn
matthias at opengis.ch
Tue Jun 9 04:57:18 PDT 2020
Hi Andreas,
On 6/9/20 1:47 PM, Andreas Neumann wrote:
>
> Hi Marco,
>
> I agree. WebP would be interesting. It could potentially replace both
> png and jpeg - if encoding and decoding is fast and if filesize can
> compete. The good thing of WebP compared with JPEG is that it supports
> transparency.
>
Exactly !
>
> According to your brief study, it seems to score well regarding file
> size, but not so well performance wise - correct?
>
Encoding and decoding performance seems to be a bit worse. But this
could be compensated by the smaller size and faster transfer.
>
> The performance that you measure - is this about time to create the
> files - right?
>
The times are rendering times (decoding).
>
> What about opening and rendering on the client? That's the other side
> of the medal.
>
> Does qt support WebP?
>
Yes
>
> Regarding your blog post: can you perhaps better explain what PNG_JPEG
> means? A PNG as a container with JPEG compression inside? Or what is it?
>
Have a look at the GDAL driver page
https://gdal.org/drivers/raster/gpkg.html
[ ... ] PNG tiles will be used to store tiles that are not completely
opaque [ ... ]
> Regarding tif: could you share your creation parameters? In my
> experience tiff performs much better than what you experience (both in
> file size and speed) if you use proper compression and creation
> parameters. E.g. you can use JPEG compression inside tiff and then you
> should have more or less the same file size as with jpeg. tiff is just
> the container, but there are thousand of combinations of creation
> options that have a very, very significant impact on perfomance and
> file size.
>
Can you ask this question directly as a comment on the blog post? Lucie
who is not in the office created the post and has all the parameters.
Bests
Matthias
> Thanks,
>
> Andreas
>
> On 2020-06-09 13:26, Matthias Kuhn wrote:
>
>> Hi all,
>>
>> At OPENGIS.ch we have recently looked into different raster formats.
>> The results can be read here:
>> https://www.opengis.ch/2020/06/09/offline-wms-benchmarking-raster-formats-for-qfield/
>>
>> Not that surprising, but one of the interesting findings was that
>> webp is very efficient. Low filesize, reasonable rendering
>> performance, support for transparency. In short, it has all the
>> potential for being used as default transport format for WM(T)S.
>>
>> Looking at our server implementation, this format is not supported.
>> Did someone ever think about or even look into that?
>>
>> Regards
>>
>> --
>> Matthias Kuhn
>> matthias at opengis.ch <mailto:matthias at opengis.ch>
>> +41 (0)76 435 67 63 <tel:+41764356763>
>> OPENGIS.ch Logo <http://www.opengis.ch>
>>
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