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Part V: Color and Output
often place a color filter over the lens to compensate adding blue to an indoor scene will counteract the yellows, for instance. Its similar to how folks who work in video need to set the white balance on their cameras before they shoot.Photoshop
Although Photoshop has long let you correct the color cast of an image through Variations (which Ill be discussing next), Photoshop CS makes it a whole lot easier by introducing the Photo Filter command. Choose Image® Adjustments® Photo Filter to display the Photo Filter dialog box, as shown in Figure 17-17. You are presented with the following
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Figure 17-17: Photoshop CSs new Photo Filter command lets you simulate various lens filters and correct the overall color casts of your images.
Filter: The Filter pop-up menu includes four specific filter options followed by a list of colors you can use to fix various color casts on your image. The first two options, Warming Filter (85) and Warming Filter (81), simulate filters that a photographer would use when the color temperature is too cool, or bluish. Warming Filter (85) produces an orange color cast, and Warming Filter (81) adds more of a tan tint to your image. Conversely, Cooling Filter (80) and Cooling Filter (82) add to your image a dark and rich cast of blue or a light cast of blue, respectively, to account for the yellows of artificial light. The rest of the options in the pop-up menu are different color presets that let you achieve photographic effects similar to those provided by some real-life filters.
Color: You can also specify any color and use it as though it were a filter. This is a great way to compensate for an unusual color cast, such as a color light source in a scene that youd like to neutralize. Click the color swatch to open the Color Picker and select a color. Alternatively, once the Color Picker is open, you can click anywhere in your image to choose a particular color.
Density: The Density slider adjusts the amount of color correction that the Photo Filter command will apply. You can also manually enter a value in the option box above the slider. Remember, you can always adjust the amount of correction after you click OK by choosing Edit® Fade Photo Filter and changing the Opacity value.
Preserve Luminosity: Select this check box to ensure that the brightness values will not be darkened by your color adjustments.Tip
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579 Photoshop CS Bible @Team LiB
You can apply the Photo Filter command also as an adjustment layer, ensuring that none of the changes you make are permanent. Well take a look at adjustment layers later in this chapter. Using the Variations command
The Variations command is Photoshops most essential color correction function and its funkiest.
On one hand, you can adjust hues and luminosity levels based on the brightness values of the pixels, something Hue/Saturation cannot do. You can also see what youre doing by clicking on little thumbnail previews (see Figure 17-18), which takes much of the guesswork out of the correction
Figure 17-18: Click the thumbnails to shift the colors in an image; adjust the slider bar in the upper-right corner to change the sensitivity of the thumbnails; and use the radio buttons to determine which part of an image is selected.
On the other hand, the Variations dialog box takes over your screen and prevents you from previewing corrections in the image window. Furthermore, you cant see the area outside a selection, which proves disconcerting when making relative color adjustments.
The Variations command is therefore best suited to correcting an image in its entirety. Heres how it works: To infuse color into the image, click one of the thumb- nails in the central portion of the dialog box. The thumbnail labeled More Cyan, for example, shifts the colors toward cyan. The thumbnail even shows how the additional cyan will look when added to the image.
Notice that each thumbnail is positioned directly opposite its complementary color, with the Current Pick between them. More Cyan is across from More Red, More Blue is across from More Yellow, and so on. In fact, clicking on a thumbnail shifts colors not only toward the named color but also away from the opposite color. For example, if you click More Cyan and then click its opposite, More Red, you arrive at the original image.Note
Although this isnt exactly how the colors in the additive and subtractive worlds work cyan is not the empirical opposite of red the colors are theoretical opposites, and the Variations command makes the theory a practicality. After all, you havent yet applied the color to the image, so the dialog box can calculate its adjustments in a pure and perfect world. Cyan and red ought to be opposites, so for the moment, they are.