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Its it fundamental nowadays renaming images for SEO? Many photos are on top positions without being renamed like: mykeyword.jpg but can be 9876986.jpg instead. Doesn't itcount much more the contest in which they are such as text around photos, descriptions and context from internal and external linking pages? Renaming everyphoto, in every gallery can be considered over optimization? Is there any study showing the impact the single factor of renaming a photo in a page? Thanks