I'm doing this post with a test account and I've gone to Google PHotos and turned on Original Quality. I can still upload the same photos as I used in
this post because I'm on the same computer.
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| Original = 5184X3456 pixels 6.2 MB, Album Archive = 2048X1365 pixels 481K |
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| Original 5184X3456 pixels 6.2MB, Album Archive = 2048X1365 pixels 367 |
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| Original = 5184x3456 pixels 6.0 MB, Album Archive = 2048x1365 pixels 368K |
All of them were the same as when using my account set to High Quality
Conclusion: Blogger compresses upon upload whether you want it to or not! Fine with me!