[QGIS-Developer] webp for qgis server ?

[Matthias Kuhn]

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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