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So what if you have a website that primarily consists of photos? Are photos not relevant content? Of course they are. Sure, I can use text captions and alt tags, but this still won't come even close to the suggested text/html ratios I've read about.
Does a photo website even have a chance of getting indexed?
However, let me point out that the main purpose of 'default' search engines is to index text, and display results that best match the user's query. That's why most of the search engines have come up with an 'image search' option that is designed to display pictures of objects, rather than descriptions of objects. The tactics I mentioned above will presumably help you rise to the top of image search rankings, as well.
so rather than push water uphill ..write about your photo's ..imagine you are trying to describe them to a blind user ( good thing in itself) ..include a basic description on your thumbnails pages about the category and a little about each ( original reason for alt text :)..larger description on your individual pages ( about 300 words per pic ) ..above and below the images ..
I was looking at a website the other day that surrounded an image with an H1 tag. That seemed a little strange to me. When I asked the designer why he did that, he said that SEs would regard the image alt tag as H1-level text. Is this even close to the truth?