[Dave Heleg]

Thanks Jeff. For Meredith, this might help:

image size: get a balloon, write something on it. inflate it. the balloon size increases as well as the writing.

canvas size: get a balloon, past a piece of metal on it. inflate it. the balloon size increases while the piece of metal stays the same.

that’s why adobe give you both options. sometimes you want to increase the whole document size so everything is bigger, as the balloon and the writing. sometimes you want to increase the area of the document to fit more objects, like the balloon and the metal piece.

i hope this helps. my 6 year old got it. good luck!