Alpha Channels 101
In photoshop, you can extract images in many, many ways. You can use the extraction tool, which does an ok job. You can hand draw with the pen tool, or the lasso tool. You can use the quick mask. You can use color selection.
All of these methods work fine, but the common denominator to all of these methods is that it is hard to do, requires alot of unnessisary work, and the details are not as good with stuff like hair, trees, ect..
Alpha Channels are way more superior than any other method of extraction of an image.
I am going to give a step by step tutorial on creating Alpha Channels in this blog.
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