1, open the original material, press CTRL+J, copy a layer, and then in the figure of the red circle there, the nature of the layer to "filter color", and then you can adjust the transparency of the side, the purpose is to overlay the way, lossless increase in photo brightness. If you don't feel enough, you can press CTRL+J and add another layer. After the adjustment, with the ctrl+e command, the layer is merged, you copy several times, merge several times, and finally become a layer.
2, click the "Channel", with the right mouse button point blue Channel, and then copy the channel, get a copy of the blue channel.
3, the Blue channel copy execution: "Filter"-"other"-"high Contrast retention", in the appearance of the screen, the default is 10, ten to ten bar, I this person is very easy-going, determined to exit.