You can adjust the dye concentration in an image to control color intensity and play with surface texture. For example, use this effect to lighten an underexposed photo or to darken an overexposed one. You need to choose a method for applying the effect. Some methods, such as Paper, generate more texture than other methods, such as Uniform Color. There are five different methods for applying dye concentration:
| • | Uniform Color — allows you to adjust only color density |
| • | Paper — adjusts color by using the paper texture as a mapping model. If you want to experiment with the effect, keep the Papers panel open while you apply the effect. This way you can switch to different papers and modify the paper controls. |
| • | Image Luminance — uses the image’s brightness as the model for the color adjustment |
| • | Original Luminance — uses the luminance of the selected pattern or clone source as the model for the adjustment |
| • | Alpha Channel or Layer Mask — sets the values in the alpha channel or layer mask as the model for the dye concentration adjustment. You can use this method only if you have a saved channel or a layer mask in your image. |
| To uniformly adjust dye concentration |
|
| 1 . | To apply the effect to: |
| • | The canvas — Click the Canvas in the Layers panel. |
| • | A selection — Click a selection tool from the toolbox, and drag in the document window to select an area. |
| • | A layer — Click a layer in the Layers panel. |
| 2 . | Choose Effects  Surface Control Dye Concentration. |
| 3 . | Choose Uniform Color from the Using list box. |
| 4 . | Adjust any of the Dye Concentration controls. For information, see Dye Concentration controls. |
| To adjust dye concentration using image luminance |
|
| 1 . | To apply the effect to: |
| • | The canvas — Click the Canvas in the Layers panel. |
| • | A selection — Click a selection tool from the toolbox, and drag in the document window to select an area. |
| • | A layer — Click a layer in the Layers panel. |
| 2 . | Choose Effects Surface Control Dye Concentration. |
| 3 . | Choose Image Luminance from the Using list box. |
| 4 . | Adjust any of the Dye Concentration controls. For information, see Dye Concentration controls. |
| To adjust dye concentration using paper luminance |
|
| 1 . | Choose Window Paper Panels Papers. |
| 2 . | Choose a paper swatch from the Papers library panel. |
| 3 . | To apply the effect to: |
| • | The canvas — Click the Canvas in the Layers panel. |
| • | A selection — Click a selection tool from the toolbox, and drag in the document window to select an area. |
| • | A layer — Click a layer in the Layers panel. |
| 4 . | Choose Effects Surface Control Dye Concentration. |
| 5 . | Choose Paper from the Using list box. |
| 6 . | Adjust any of the Dye Concentration controls. For information, see Dye Concentration controls. |
| To adjust dye concentration using clone source or pattern luminance |
|
| 1 . | Open an image. |
| 2 . | Do one of the following: |
| • | To use a clone source, choose Window Clone Source. In the Clone Source panel, click the Open Image button  , and Open Source to choose a clone source. |
| • | To use a pattern, choose Window Media Library Panels Patterns, and click a pattern swatch from the Pattern library panel. |
| 3 . | Choose Effects Surface Control Dye Concentration. |
| 4 . | Choose Original Luminance from the Using list box. |
| 5 . | Adjust any of the Dye Concentration controls. For information, see Dye Concentration controls. |
| To adjust dye concentration using a layer mask or alpha channel |
|
| 1 . | Do one of the following: |
| • | To use a layer mask, choose Window Layers, and click the layer that contains a layer mask in the Layers panel. |
| • | To use an alpha channel, choose Window Channels, and click the alpha channel in the Channels panel. |
| 2 . | Choose Effects Surface Control Dye Concentration. |
| 3 . | Choose the Layer mask or alpha channel from the Using list box. |
| 4 . | Adjust any of the Dye Concentration controls. For information, see Dye Concentration controls. |
| Dye Concentration controls |
|
| • | Presets — the controls in this area let you choose a preset effect, save the current settings as a preset, and delete a preset |
| • | Maximum — controls the amount of dye on the peaks of the texture |
| If you think of texture as peaks and valleys, the Maximum slider controls the amount of dye on the peaks, and the Minimum slider controls the amount of dye in the valleys. |
| • | Minimum — controls the depth of the texture. The lower the values, the higher the contrast between the peaks and valleys. The higher the values, the flatter the image appears. |
| • | Preview — enable this check box to preview the effect in the document window |
| • | Reset — resets the sliders to their default settings |
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