[Freegis-list] TFW format

[Petr]

Hello,

i need help with tfw format. I have tiff image and tfw file with description:
200.00000000
0.00000000
0.00000000
-200.00000000
3408200.0000
5635500.0000

I searched internet and not found any information about using of this map.

I need transform standard GPS coordinate (eg.: 50d04m55sN 14d26m03sE) to pixel coordinate in my map 
  (eg.: 256px,414px aproximately) and backwards.

How can i do this? I can't find any source code on the internet which do this.

Thnak you for your help

Peter