GridImageUpload
Download
Requirements
Windows and .NET 2.0 for this version, when I get the image compression library compiled for other platforms it will work on Linux and OSX.
Note
This program may alter images, but it is disputed. It is known that various parts of the image delivery path (the way the image is delivered *back* to your client) can often alter the image before you see it, so even if SLImageUpload does a good job with lossless uploading, SL and the SL client are known to damage the image on the way back to you. Sometimes. Qarl Linden is very tuned in to this entire issue, and promises a fix that is currently being tested. Regardless of source, the effect can be seen fairly easily when uploading low resolution (e.g. 32x32) images losslessly with solid gray boarders around colored blocks. When you see it used in your client, it will look very blurry, despite being uploaded losslessly. Interestingly, the cache system of the SL client also damages images, and clearing your cache can (temporarily) improve the image quality. The effects are varied, and not all images are affected noticibly.
The Maya lossless uploader by the same author does appear to upload losslessly without corruption (we tested it).
It can be downloaded from: http://www.jhurliman.org/download/importprimscript-1.0.2.zip
With some work it may be usable as an alternative to this program. The uploading executable itself does not require Maya.
For more information, see: https://jira.secondlife.com/browse/VWR-866 http://jira.secondlife.com/browse/VWR-2404