Lot's of folk are posting image to the Web. The feeling is that they brighten their blog posts by breaking up the grey expanses of type. Hmmm. This one reason the editors with whom I once worked insisted on placing pictures on their pages.The more things change the more they stay the same.
Taken from the Web for illustration purposes:
Now, let's see what a few seconds of image enhancement does.
If this looks as good on your screen as it does on mine, I think you'll agree that a few seconds spent setting endpoints and tweaking contrast is time well spent.