I really don't know how to fix this problem, so I turn to /po/...I use HP Photosmart C3180 printer, the pages are always darker than it looks in Adobe. I know its not suppose to be this way cause sometimes its just pitch black, you can't even see the folding lines. Is there any way to fix this?
it will be in your printer settings. that, or your monitor colour settings are fucked
Try printing in draft quality.
Simple... buy a canon or epson instead of a crap-ass HP.
Turn up the brightness and contrast in photoshop first.