My Experience: Free, Batch-Capable Image Converter for TGA -> JPEG
NetPBM
I was recommended using NetPBM, which can be found at http://netpbm.sourceforge.net/. NetPBM tool work with pictures. Many formats like TGA, JPEG. Works on many computers. Very handy.ImageMagick
Another recommended tool was ImageMagick. Magic tool change pictures. Use words for computer to make pictures different. It supports TGA to JPEG conversion and is widely used in the free image manipulation community.cjpeg
Also I know cjpeg, which is part of the JPEG toolkit from the Independent JPEG Group (IJG). Jpeg work with many picture tools. Load, save Jpeg pictures. Work with other picture types too. While there may be a version of jpeg specifically for Windows, it can also be compiled using Windows compilers.Want convert many files? Make little program. This program writes own little list, tells computer how to change each file. This will enable you to process a lot of files automatically. However, remember that the suggested tools are command-line based, so some familiarity with the interface might be necessary.