My saved files are too small!

[PeytonLyn]

  I've recently decided to make some of my artwork into prints.  But I've noticed when I go to print them they are extremely compressed.  For instance, one piece went from being 3 MB before being saved and then changed to 200 KB after I saved it.  I've tried saving them as .png and .jpeg files, but the sizing issue still remains.  Does anyone know how to fix this??

[Keitou]

did you check your resolution? the canvas size? and the amount of layers did you use?

the more resolution you apply to the canvas when you start off a new work, it will come up with the space you want so badly 

think about a 3000x3000 pixel sized and 300 dpi resolution canvas.

also, the color amount you use and layers, will help to build up those lazy files! keep it up!

jokes aside, hope that help to clarify your concern.