You can edit PDF documents in Acrobat, but only in Acrobat X are tools improved.
When you edit PDF documents there are several ways to do it. You can edit using Adobe Acrobat, but Acrobat X editing tools are much better than before.
Gimp vs Photoshop - how do they compare? Gimp is free image manipulation software and part of the GNU Project. This beginning Gimp tut explains how Mac users install and use Gimp at a basic level.
Just what is a Bitmap? Simple Photoshop color mode explanation & image tutorial.
One of the few ways that poor image quality can be improved. This article, 'Just What is a Bitmap', gives a simple explanation of the Bitmap Photoshop color mode and demonstration of its use in print.
Creating a Photoshop Cut Out and Placing as a Layered PSD File in InDesign
If you want to retain transparency when placing images in InDesign, you need to save a Photoshop cut out image as a layered PSD file. It'll blend in nicely!
Which Color Mode to Select for Press-Ready Images - CMYK, Bitmap or Grayscale?
If you're uncertain about what color mode to convert prepress images to, here you'll find the basics of creating CMYK, Grayscale and Bitmap images. Which of the color modes should you select and why?