increase the resolution of an image

[tagada_tagada]

Hello,

What is the command to increase the resolution of an image named toto.jpg and affect it a resolution of 300 dpi?

Thank you

[whoisgregg]

Are you trying to change the internal resolution value without changing the pixel width/height? Or are you trying to resize a 72 dpi web image to 300 dpi quality?

Also, which commands have you attempted so far?