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Unless you have fairly unusual keywords to put in the alt, it's probably way more trouble than it is worth.
But that depends on how much you value your time. As an experiment what you learn from it may be worth the expense.
But alt tags are fairly weak forms of text. You'd be better off just putting that text on your page.
There's some additional strategic possibilities for images.google, but that tends to work better with full size images.
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