Screenshots...
What program can I use to convert a screenshot .tga file, to a .jpg? Also about the BNS script maker in the download section, when I enter the the picture file name as the thumbnail, it doesn't work when i enter Portal. It just shows a black picture. ???
Any Help? 
GIMP is a freeware image program, you can use that to convert. I think there is a TGA->JPEG conversion program floating around too.
Alternately, you can just use the "jpeg" command in-game, to take a jpeg screenshot instead of a targa.
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Thank you.
I already have GIMP. I figured out how to convert the .tga, but I'm still having trouble with the Bonus Map thumbnail. 
The .tga used for bonus map thumbnails need to have a fully-white Alpha 1 layer.
Just use Photoshop, not only does it do wonders, but it restores some of that quality taken away from the conversion, but of course not all of it.
photoshop costs money, and not all of us [removed "spoiled-rich-kid" joke]
There's always the alternative.
Yes, I use Corel Paint 8. Old but gets the job done. I can save .tga files. Also, I also have IrfanView which is good to resize .tga files quickly!
The more you give, the less appreciated it will be received.
Or for those who can't afford PS, Paint.NET is a free alternative.
I get you. 