[mapserver-users] File size of generated PNG

[Rahkonen Jukka]

Hi,

Have you already tried quantize and compression options from http://www.mapserver.org/mapfile/outputformat.html? The "png8" example is a good starting point.

How does your current png outputformat look?

-Jukka Rahkonen-
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Jackey Cheung wrote:

> Some background first. I'm currently using MapServer + TileCache, and planning to try out the new MapCache stuff. While using MS+TC, there was a headache bothers me. Although not specific to MS, I'm not sure where to start, so posting here in hope of getting some pointers.

> The problem is the file size of PNG images genereated by MS. They are relatively much larger than we want. Now we have one lengthy process that runs stuffs like pngcrush after seeded a cache with TC. This is a painfully lengthy proccess, which takes months to finish due to the coverage of map.

> Just wondering, how to make MS generates minimum size PNG, or how to make TC to slice images with minimum file size? Or is using "post-process" the only way to achieve it? We are not talking about the absolute minimum, just want to have the smallest size in average.