Need help! How to gnuplot a picture??

I would like to ask if I have already plot a graph using gnuplot, the setting(made by others) is in "gnuplot.defaults":

gnuplot> load '<ParadisDir>/inputs/gnuplot.defaults'
gnuplot> splot 'box.in' with lines, '0t0001' w lines

How to transform it to bmp file? (or other types of pictures?)

can I massively( and automatically) do this so that I'll have a set of bmp files (say, 100 of them) to make movie?

Thanks very much. All replies are welcome.

Using bmp is seldom a good idea. Better to use gif or png, which are easily transformed into an animated version using tools you will find on the internet.

try

set terminal png
set output "output.png"