Image Text: And I could replace you with older pictures of you, from back when you looked happy.

The hue of an image is the image's color or shade.  The hue adjustment in Photoshop lets you move a slider back and forth to shift the colors of the image.  This comic is suggesting that instead of taking the typical American trip to someplace like New Hampshire to see the leaves change colors in autumn, one could take a picture of summer leaves and just play with the hue slider in Photoshop to get a similar appearance.  Of course, that wouldn't replicate my favorite part- the smell.