This is a modification of the old trick porn sites used to use in the days when search engines used to go with site content to rate files.
Font on Background colour will actually degrade your rating at Google and more modern search engines so I wouldn't recommend it.
If you want a hidden link in a picture you are as well to setup a link map and have a small area of an image as clickable as this would stop "Select All" from giving the game away.
You need to be savvy in the use of Z-indexing to pull off your trick properly too. The link would have to be above the image for it to work and you havent explained how to achieve that in your initial post/
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