It could be intended to say "fade to black," meaning that the picture should fade away, leaving a black screen. But you say there is no misprint. In that case, my best guess is that it means to fade out the foreground of the picture, focusing in on whatever is in the back. I have never heard this expression before, and when I tried looking it up I found nothing helpful, but that's what makes the most sense in my head.

The expression is 'fade to black'. Originally it referred to the way old films shown in the cinema would fade out to a black screen at the end of the movie. It is also (apparently) the title of a song referencing suicide/depression, but that is not where the term originated.

"fade to bLack" is a song about depression