Many of us use various images on our website, but have you ever though for a minute, that how come search engine crawlers will optimize these images, as crawlers are blind and can only read text and not the images and videos. Then if some one's is for example on image gallery then how come he will optimize it.???

The main thing required for the web site optimization is text content.
and it is difficult to optimize images.

There's no need to get upset, I'll tell you the way to optimize images.

When we upload images in the website, it uploaded via img tag in the html
" "
now there is alt tag used in the img tag, by using this you can optimize images. how??? I'll tell you.

" "

now when search engine crawlers land on your site, they will not see any image, but they can read the description/keywords written in the alt tag, and by that content your images are optimized.

Read more on: http://geekscouch.com/image-optimization-tips-for-free-support-paras-babbar