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A few thoughts on tileset previews for J2O.
The images should be kept lightweight, as in small in file size. The purpose of a preview is just to let the user get a quick glance at what the tileset looks like without having to download it and all. Therefore, the quality of the preview image can be dropped down greatly in order to save on file sizes (and download times). I'm thinking scaling the image down to 50%, and save it as a low-quality JPEG so that the compression can be way up.
See if you can use a compiled (c?) version of this conversion program on the server as PHP or other scripting languages are relatively slow. Then just invoke the compiled program from the site script.
The images should obviously be cached. If there's a concern about size, delete preview images that haven't been viewed in over a month or so. Generate preview images on demand.
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<div style="float: right; width: 100px; height: 70px; margin: 5px 15px;"><img src="http://madskills.org/monolith/idleserver.gif" style="width: 98px; height: 65px;"><img src="http://madskills.org/monolith/theserver.gif" style="width: 98px; height: 65px; position: relative; top: -65px;"></div><div style="margin: 0 3em; font-size: 80%; font-style: italic;">Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres.</div><div style="text-align: right; text-size: 80%;">1 Corinthians 13:4-7</div>
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