[sldev] Webmap API change

[Harold Brown]

I just did a test run of optipng (without any command line options) on one
of my region name overlay folders.  It reduced the file sizes from around 2k
per image down to 1k per image.

I'll need to add that into my image generator to use optipng.



On Fri, Jan 30, 2009 at 9:40 AM, SignpostMarv Martin
<me at signpostmarv.name>wrote:

> Overlays are likely to have a very limited colour palette, parcel
> borders/ownership especially.
>
> Tools such as optipng can do wonders to decrease the size of certain PNGs,
> too.
>
>
> ~ Marv.
>
> Ryan Williams (Which) wrote:
>
>> Philip Rosedale wrote:
>>
>>
>>> I think that the problem is that you can only actually overlay
>>> transparent images in a browser using .PNG, right?  So that means that
>>> you can't really do it, because the only way to get anywhere near
>>> reasonable performance is the compression you get from JPEG.
>>>
>>>
>>
>> The base images compress well with JPEG, but any overlay images you'd
>> care to generate will likely compress well with PNG.  E.g. Google's map
>> overlays are mostly transparent with solid blocks of color.  Also, while
>> it is unacceptable to have slowly-loading base tiles, it's not as bad to
>> have overlay tiles that take longer to download and pop in later, on
>> top.  Food for thought.  :-)  Glad you made provision for overlays,
>> though.
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