When you are combining images in Adobe Photoshop, for example bringing a person into a different background, it is necessary to remove the existing background. But don't use the eraser tool! The reason to avoid the eraser is tool is because if you do, there is no going back and getting those pixels that you have erased. Sure, you might say, I can use "undo" or "history"! Yes, but only while you have the file open.
If you submit the image to a client and find later that either you have made a mistake, or that they would like to make a change, that is when you are going to regret using the eraser tool. So don't do it! Instead use a layer mask. That way you can "mask" pixels, that is, make them invisible, but you aren't permanently deleting them. If you find out later than you have masked a portion of the image (which gives the appearance of being erased), you can unmask that area and the pixels are still there! This is a real life-saver.
If you would like to get personal on-site software training in Adobe Photoshop, Illustrator or Dreamweaver in the greater Phoenix, Arizona area, please contact me. Yes, I will also do a training session on setting up your blog on Google Blogger. Paypal accepted, morning appointments only.
Contact Brad directly