For a couple of clients I've been using GDIPlusX ( http://vfpx.codeplex.com/wikipage?title=GDIPlusX&ProjectName=vfpx ) for image manipulation, mainly converting .BMP to .JPG. It works well.

I just encountered a video capture application (BlackMagic Media Express 2.x) which saves HD (1920x1080) frame grabs to Targa (.TGA) format - there is no other choice. I did some Googling but it looks like .TGA is not supported in the .Net System.Drawing namespace, so it's unlikely it'd be supported by GDIPlusX.

One option for converting .TGA files is IrfanView ( http://www.irfanview.com/ ). I'd used this program in the past for image viewing, but I was previously unaware that it has a powerful command-line interface (CLI). Its CLI makes file conversion very easy e.g.

* Convert a .TGA to a .JPG, resize from 1920x1080 original to 960x540 (1/4 size),
* resample for better quality, use 50% JPEG quality:

i_view32.exe Source.tga /resize=(960,540) /resample /jpgq=50 /convert=Destination.jpg

IrfanView supports a fairly extensive list of formats for conversion or other basic manipulation tasks.

IrfanView is free for non-commercial use, US$12 for a commercial license. At that price, it may be a time- and cost-effective alternative to using GDIPlusX for the operations IrfanView can handle.