convert to pgm

[mj0000]

I would like to convert pictures to pgm

xnview conversion is ok BUT I would like to have the pgm numbers stored in lines and columns

do you know how to do that ?

thanks in advance for your answer

[xnview]

Sorry but i don't understand what you means?

[mj0000]

ok, I'll try to better explain

I would like to have a pgm file where numbers (gray levels) are ordered by lines like in the picture.
For example if a have a picture 5*3, I would like to have a pgm file like this :
P2
5 3
255
45 45 45 45 82
45 45 45 45 82
45 45 45 45 82

When I use Xnview to convert the file from jpeg to pgm, I get :
P2
5 3
255
45 45 45 45 82 45 45 45 45 82 45 45 45 45 82