shewolfnm, we can't see your image because you pasted the wrong link!
Jane, yeah you got it (basically). Solarize, find edges + contrast, or glowing edges filters all bring it out. However these work by finding the edges which are much more subtle than the color differences.
I designed this puzzle to take advantage of the fact that certain RANGES of colors APPEAR the same even though they are numerically very different. If you were to simply adjust the HUE of the image (-67) you will see that all of a sudden it becomes readable.
Therefore, I took some colored text, placed it over the image, and then adjusted its hue until it looked similar to the background -- even though I knew the color values were actually quite different.
Of course that means you can also do it with curve editor or levels. In particular, just adjust the green level set. You can get rid of the red and blue to make it easier to read too.
Let me give you another handy tip...usually by looking at the histogram of the level editor you can see bumps that contain the most information. However, if you look at the histogram for the whole image at once, its harder to spot. If you look at the histogram for a smaller region of the image, you can see the differences in the histogram for that region much better.
Since the text is put over a gradient, it is easier to read different parts of the words with a different scale factor..
Using this method it is easier to see that the last letter is "n" not "r"
edit: what is "pretrude"?
It should be protrude.
