Using the Match Color command (Photoshop)
The Match Color command matches colors between multiple images, between multiple layers, or between multiple color selections. It also lets you adjust the colors in an image by changing the luminance, the color range, and neutralize a color cast. The Match Color command only works in RGB mode.
When you're using the Match Color command, the pointer becomes the Eyedropper tool 
. Use the Eyedropper tool on the image while making adjustments to view the color pixel values in the Info palette. This gives you feedback regarding the changes in color values as you use the Match Color command. For more information about using color samplers, see Viewing the color values of pixels (Photoshop).
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