This tutorial is not meant to be an indepth look at working with channels. I'll show you a few of the basics.
For these exercises we'll use some building blocks. These images are from the Hemera Photo-Objects Volume II Collection.
- As we covered in Creating an Embedded Clipping Path, you can use the magic wand and other selection tools to select the portions of your image you wish to have transparent. For this image, the magic wand tool works to isolate the three blocks from the white background. To isolate a single block, Photoshop's Magnetic Lasso Tool works nicely.
- As also shown in the embedded paths tutorial, converting your selection to a work path allows for precision finetuning of the clipping path.