As we all know, the Match Color utility was a great addition to the Photoshop series. But it does lack an important feature. When I have two images,  and , and I choose one image  to match color to, it copies colors that I see to the  image, but it does not preserve the brighness of the  image. In very most cases I want to preserve the brightness, so:
the Match Color screen should look like this: on the right half, the  image (or layer) preview, and under it, the histogram. On the left half, the  image (or layer) preview and its histogram. There should be the selection tool at the  source image screen half. Corresponding to what parts of the source image I choose, the histogram value should change, until the histogram of the selection will look like the histogram of the  image. Then I press the OK button and for the final image I get one with colors matched and brightness preserved.
Very useful for ones using the Match Color option intensely.