One way for finding more color is Don Marquis' method: Convert the file to LAB. Create an adjustment layer. Make the A and B graphs steeper by moving the lower corner to the right and the upper corner to the left. Do this for both of the A and the B channels to taste. Change the layer's blending mode to 'color'. Adjust the opacity of the layer to taste. Flatten and convert to your RGB working space. Sorry if you already heard of this. What it does is increase the separation between the colors in the image, and it can be very good for intensifying colors in an image.
Here's a screen shot of the first step of Don's method:
Here's another way, the Joseph Holmes method. This will only work if you editing space is one of the middle or smaller color spaces. Suppose the image is in sRGB. Edit>Assign Adobe 1998 to the image. This will intensify colors. Now edit>convert the image back to your working space. Joe had a whole bunch of special spaces for doing this. I usually use Adobe 98 or Ektaspace. If your editing space is Adobe 98 or PRophoto, then you'll need to convert to sRGB for the web. So do that conversion, and then try Joe's method.
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