This question is more for the SEO specialists. I am creating a B2B website in which I will have repetitive images showing in my Portfolio section, in a slideshow and grid format. Even though I will be naming the images intelligently, I plan on refraining from giving ALT tags to each and every one of them, because they will be extremely similar/identical to each other, and I do not want to be penalized by Google for redundancy (I do plan on adding null ALT tags to each, however).
Here is my question: Will image names and then keyword-rich copy elsewhere on the same page as the images be sufficient for image SEO? Captions will not always be an option in my particular layout, which I know can assist with SEO. But I just want to make sure that I am covering all my bases (within reason) when optimizing my images for search. So, to recap: I am planning on relying on image name and then contextual text on the page to boost image optimization, rather than keyword-loading the ALT tags on repetitive images. Make sense?