We rarely ever talk about Bing’s outstanding image search, but I spotted a thread today in the Bing Community forums on that topic.
In short, one webmaster complained that Bing had about 50% of the images from his site, when compared to Google. So Google had about 50 pictures from this guys site in their index, coming up for a site command. Bing had about half that.
Brett Yount forwarded the complaint the the image search team at Bing and when he received a response, he copy and pasted it in the forums. This is what they said:
This is really no different than web search – Google, Bing and other search engines may not consider a page worthy of crawling or indexing due to it’s popularity or lack there of. This works the same way with images, according to Bing.
Forum discussion at Bing Community.