Technique 22 to find out more about adjustment layers.)
For me, the choice is clear; I use an adjustment layer to apply a photo filter. It’s infinitely more flexible. But, in the spirit of completeness, I’m including directions for applying a photo filter either way.Here’s how:
Open the image to which you want to apply the photo filter.For this example, I’m using the photograph shown in Figure 33-1.

Figure 33-1: I’m adjusting the tone of this photograph using photo filters.
In the Layers palette, select the layer you want to apply the photo filter effect to.
Click the Create New Fill or Adjustment Layer button at the bottom of the Layers palette and choose Photo Filter from the menu (shown in Figure 33-2).

Figure 33-2: Choose Photo Filter from the menu.
If you want to apply the photo filter command directly to a layer, choose Image>Adjustments>Photo Filter.The Photo Filter dialog box opens as shown in Figure 33-3.

Figure 33-3: Use the Photo Filter dialog box to apply different color tones to your photograph.
In the Use area, choose a preset photo filter from the Filter drop-down list or click the color square and select a color using the Color Picker.
Preset photo filter effects range from Warming Filter and Cooling Filter to Underwater.
Move the Density slider to adjust how much the filter affects the photograph.The higher the setting, the more the photo filter affects the image.
Click OK to apply the photo filter to the photograph.Even though Figure 33-4 is grayscale, you can see the difference that a Magenta photo filter makes.

Figure 33-4: Photo filters change the color tone of a photograph.