Because when you do image transformations, you are sending an API to another piece of Google's infrastructure, which I would assume is highly optimized for doing such things. If you do it in your own code, you'll probably pay more in CPU cost than you would for the API call. If it's just a matter of bumping into the number of times you are allowed to make those API calls, let them know. They've been known to relax some quotas for users with real needs.
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