[QGIS-Developer] webp for qgis server ?

[Andreas Neumann]

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. According to your brief study, it seems to score well
regarding file size, but not so well performance wise - correct? The
performance that you measure - is this about time to create the files -
right? What about opening and rendering on the client? That's the other
side of the medal. 

Does qt support WebP? 

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?


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. 

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 
> +41 (0)76 435 67 63 [1]
> [2] 
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Links:
------
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[2] http://www.opengis.ch
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