|yeah you have to fix your colors here. An easy way to get started is to set the 'true black', and 'true white' points of the image.
Try this: In Photoshop, click on adjustments > levels. Then you'll see these little eye-droppers looking things. One is for black, one for gray, and one for white. Lets forget about the gray one for now. Click on the white eye-dropper, and then click on the whitest white part of your image, this tool will make that pixel absolute white, and will adjust all of the other colors accordingly. So play around with it, here it will likely be the reflection on one of the pool balls. So with the white eye dropper, click on that reflection. The colors will shift. Then do the same with the black eye dropper, use it to click on the black numbering on one of the balls. Again, the colors will shift, and you will be on your way to getting rid of that unflattering yellow light you have going on in this image. You'll be amazed at how much this can transform your image! Get back to me if I haven't explained this in sufficient detail or if its confusing, good luck!