The mother of all picture format converters

[Redrobes]

Your right, I only use a few. I use PNG generally, JPG if its a photo and it needs to be compressed hard - like for this forum uploads. I use bmp sometimes if I need fast file load and save which is rare. There is iff which is also rare but occasionally I use a program that does not understand anything else. Sometimes I am given psd files and now and again I use raw RGB which has come from data not necessarily from image sources. There are also GeoTIFF images for height maps and the new 16 bit formats to mitigate quantization like TG2 and HF2 as well as 16 bit PNGs. Theres also GIF's for doing animations and image magick also does movie formats like mpeg and mjpeg. JPEG2000 has incredible compression but its loaded with patents so its not well supported. Format conversion is a chore but given that its necessary now and again its nice to have something that will do them all so you don't have to struggle with them.

Edit -- Actually I could add svg, pdf and icon files too to my list.