Many people think that just by naming their image file with the keyword that they desire, and by inserting a descriptive “alt” tag text in the HTML code, the Google’s Image Search system will index your image and thus your page. Well if only it was that easy! That does have some effect but not much!When you search for an image in Google the image spider(s) looks at the text before and after the images on webpages, and it uses these to get its listings. It is estimated that the amount of words before or after is somewhere between twenty and forty. However this all depends on how big your words are.
Of course many of you well educated search buffs will tell me that all the text on websites are spidered. That's true, but the text surrounding the images will have more influence.
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