as a former yearbook editor and designer, let me explain this further
if youre only planning on posting your art online, them please save it as .png ;this is also better for transparencies as well
please, if youre planning of printing your art, NEVER use png. it makes the quality of the image pretty shitty. use jpeg or pdf instead. and always set your work at 300dpi to get a better printing quality - this means, the images are crisper and sharper and theres no slight blurriness. i had a talk with my friend who is currently taking design, and pdf is much better to use when youre working with a bigger publishing company because it still has the layers intact, but if youre only planning on printing your stuff at staples or at some small publishing store, the jpeg is the way to go.
this has been a public service announcement
As a photographer, let me add to what tumblr user suchirolle has said.
If you are printing and these options are available and you’ve got the storage space, .tiff and .raw are also excellent ways to go and will make the biggest sharpest prints you can make. With .raw I’ve made a print of a photograph at 20”by20” no problem and could have gone bigger if I had taken a better shot(it was night time and I have an entry level dslr, so noise ‘n’ stuff woo!)
And as suchirolle said, always have your work at 300dpi if the option is available.
if someone has experience in tiff and raw in digital art that isn’t photography, please inform me if my statement was incorrect ‘cause I’m just coming from a digital photographer’s standpoint