Hi Andrea,
Here is an answer from the Google WebP team:
/That's a very good question actually! The short answer is that WebP
achieves better compression rates than jpeg/png by being more complex,
and the cost of this complexity is that it's slower, particularly at
encoding.
/
/https://groups.google.com/a/webmproject.org/g/webp-discuss/c/Ad6rXupeWZ4/
Disadvantages of the WebP format had been added to the documentation.
I have not been able to achieve any improvement.
I think GWC would be the right way.
Best regards,
Martin
Am 06.02.2023 um 10:41 schrieb Andrea Aime:
On Sat, Feb 4, 2023 at 4:15 PM OpenDEM <cont...@opendemdata.info> wrote:
Hi Andrea,
Unfortunately, all the advantages of the WebP format regarding
file size are negated by slow and energy-consuming processing.
Only in exceptional cases where a slow internet connection < 500
kbit is given (e.g. slow G3) this format makes sense.
The increased processing time correlates with increased energy
consumption.
Measured with a commercial power meter on a local PC for one hour
(multiple times).
Stack: Windows10, Java11, Tomcat9, Chrome Browser, OpenLayers
Client, random WMS GetMap requests every 0.5 seconds
PNG 0.067 kWh vs. 0.071 kWh WebP vs. NoRequests 0.047 kWh.
The difference is small enough that you might overcome PNG by adopting
the data extraction tricks
I pointed at in the PR, which we are currently using for the PNGJ
output. In particular, check if the input image
is a BufferedImage, and if so, use getRaster() method instead of
getData(): the latter is forced, by contract,
to return a deep copy of all the pixel values, while getRaster()
provides the actual data buffer used by the image.
Also, try to identify cases where you can just do a System.arrayCopy
or simply use the original byte[], rather
than copying values around.
This will require changes into the Java webp library.
However, the WebP format could serve as an input format for the
GWC and then play out the advantages again. I would like to tackle
this next.
Makes sense, cached images are produced once and sent over the network
multiple times, so the higher
energy cost of production is offsetted by the lower network
transmission cost.
Cheers
Andrea
--
Regards,
Andrea Aime
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