This also goes with the vintage tutorial.
So what is a blending mode?
Well I actually don’t know the technical term for it, so I just say that it’s
an effect that you can use on a layer to blend it with the preceding layers.
There really is no wrong way to use the tool, just play around with it! After
a while you will get the hang of it.
You will find it on the small tool bar in Photoshop 7+

Here you can do a lot of fun things, so just cycle through the modes and see what happens.
NOTE: Each change to your blending mode is a change to the document so keep that in mind because if you do to many changes to the document, you can’t undo them.
April 21st, 2008 at 7:59 pm
A simple fix for the document undo thingy is to increase your history to like 200. This makes Photoshop a little bit more ram hungry, but it is well worth it because it sucks when you can’t undo.