If I deleted a file on my Mac would Time Machine delete its copy on my external hard drive when backing up?

I just finished backing everything up onto my new 2T WD My Book Essential because my Macbook Pro is absolutely full of Photoshop files. I want to delete them from my Mac (since they're backed up) but I'm too scared Time Machine will delete them from my external hard drive.
Thanks in advance.

Move the images over to an external drive that is connected to your Mac by USB or FireWire.
Then....Time Machine will backup both your Mac..and..the hard drive automatically. 
Can you elaborate on this?
I have a 128GB McAir (mid 2011 model) with a 2GB TC for backup. I need another external hard drive to save pictures and home HD videos. I wanted to partition the TC but learned that is not recommended. So now I’m looking to get two external hard drives to store priceless files and back it up.
Your comment makes me think I only need one external hard drive and use the 2GB TC as backup. A good option since 2GB is an overkill for a 128GB notebook.
Can you please share the steps? Plug in a HDD to McAir and run Time Machine? Is that it?
Thanks.

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    The Tragedy that will be, the tragedy that never should be
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