Solution

Click on the Create new fill or adjustment layer button at the bottom of the Layers palette, and choose Levels... from the menu that appears. The Levels dialog box will be displayed. Select Red from the Channel drop-down menu, as shown at right.

Selecting the Red channel

Adjusting levels for the Red channel

Adjust the sliders beneath the histogram so that both the white and the black sliders are lined up with the edges of the histogram. (You'll need to drag the white slider to the left, and the black slider to the right, as shown on the left.)

Adjusting levels for the Red channel

Next, select Green from the Channel dropdown menu, and repeat the process with the black and white sliders, as illustrated at right.

Adjusting levels for the Blue channel

Adjusting levels for the Green channel

Finally, select Blue from the Channel dropdown menu, as shown at left. Align the white slider with the right-hand edge of the histogram, but drag the black slider past the left edge of the graph until the blue color cast clears. The resulting photo is shown below, alongside the original image.

Adjusting levels for the Blue channel

Original photo With levels adjustment

Original photo With levels adjustment

The final photo at right, with blue tint removed
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