How can i change a work in Photoshop from 72dpi

[Elisa]

to 300dpi easily? i work on a 72 dpi in photoshop, after knowing that 300dpi is the recommended value for printing, i have to change at least 5 works to 300dpi....

so can i just simply open the file, click image | image size ...and change the 72 to 300?

or rebuild everything from scratch! (since i still have the files with me).....will these two methods have a drastic and observable effect/improvement?

or is there still an easier way yet without sacrificing quality?

[mavinakdel]

Sure you can, just change the 72 to 300 dpi and resave the image. on your screen you cannot visibly see the difference, but if you saved at 72dpi it would not be print quality. That is where you would see the difference.