SAMS Teach Yourself Adobe® Photoshop® CS2 in 24 Hours [Electronic resources] نسخه متنی

The most obvious way to make a color adjustment is to compare before and after views of an image. In Photoshop, the tool for doing this is called Variations. It's the last item on the ImageAdjustments submenu. Variations combines several image adjustment tools into one easy-to-use system that shows you thumbnail images that are variations on the original image. You simply click the one that looks best to you. You can choose variations of hue and brightness and then see the result (which Photoshop calls

Current Pick ) compared to the original.

Something Missing?

If Variations doesn't appear on the Adjustments submenu, check the ImageMode submenu to make sure you're in 8-bit color mode and that you're not using Lab or Indexed Color mode. If those settings are OK, the Variations plug-in might not have been installed. Consult the Photoshop manual for information about using plug-in modules.

Figure 6.2 shows the Variations dialog box. (See it in color in the color insert.) When you first open it, the Current Pick is the same as the original image because you haven't yet made changes. You can set the slider to the left (Fine) or right (Coarse) to determine how much effect each variation applies to the original image. Moving it one tick mark in either direction doubles or halves the previously selected amount. The finest setting makes changes that are so slight as to be almost undetectable. The coarsest setting should be used only if you're going for special effects and want to turn the entire picture to a single color. The default (middle) setting is the most practical for normal adjustments.

Figure 6.2. The seven thumbnails at lower-left adjust hue, whereas the right-side set of three adjusts brightness.

[View full size image]

Adjusting Shadows, Midtones, Highlights, and Saturation

When you use Variations to adjust a color image, you have the option of individually adjusting shadows, midtones, highlights, or overall color saturation.

Shadows, midtones , and

highlights are Photoshop's terms for the darks, middle tones, and light tones, respectively, in the picture (or what would be black, gray, and white in grayscale). When you correct them with Variations, you change the color (hue) of the shadow, midtone, or highlight. Saturation affects all of them at once, increasing or decreasing the intensity of the color, although not changing it.

When you select shadows, midtones, or highlights, you adjust the hue and brightness of only that part of the picture. The advantage here is that you can adjust the midtones one way and the highlights or shadows another way, if you choose. Each setting is independent of the others, and you can, for example, set the midtones to be more blue, thus brightening the sky, yet still set the shadows to be more yellow, offsetting the blueness that they possess inherently.Hour 5, "Color Modes and Color Models,"

hue refers to the color of an object or selection.

Brightness is a measurement of how much white or black is added to the color.

Selecting Saturation changes the strength of the color in the image; the setting choice is simply for less or more color strength. In Figure 6.3, I'm adjusting the saturation of this photo. Remember that you can apply the same correction more than once. If, for instance, less saturation still leaves more color in the image than you want, reduce the saturation again to get even less.

Figure 6.3. Less saturation gives you a duller image. More saturation gives you a more intense one. (Don't confuse saturation with brightness. Saturation changes the amount of color. Brightness adds light.)

[View full size image]

Try it Yourself

Adjust an Image Using the Variations Command

Learning to work with the Variations dialog box is an excellent way to understand how colors work.

Open any color image. Choose ImageAdjustmentsVariations.

Set the radio buttons according to what you want to adjust: Shadows, Midtones, Highlights, or Saturation.

Use the Fine/Coarse slider to determine how much adjustment to apply.

Watch the Original and Current Pick thumbnails as you create the desired variations by clicking the appropriate thumbnails. The following are some tips for getting the effect you want:

To add color, click the appropriate color thumbnail.
To reduce a color, click its opposite on the color wheel. To reduce magenta, for example, click green.
To adjust the brightness, click the thumbnail for a lighter or darker image.
If you're not sure exactly what you need to do, simply click the image that looks most correct to you.
If you think you might have overdone your corrections and want to go back to the original image, press Option (Mac) or Alt (Windows) to change the Cancel button to a Reset button. Clicking the Reset button restores the settings to zero and reverts to the image saved prior to changes. (Note: This works with all adjustment dialog boxes.)

Click OK when you're done or click Cancel to undo all your adjustments.

Saving and Loading Corrections

Two other buttons appear in this dialog box, and in the other adjustment dialog boxes as well. These are the Load and Save buttons. They can save you a lot of time and effort if you have a whole series of pictures that need the same kind of corrections. Perhaps you used your digital camera to shoot several outdoor pictures with the same lousy light conditions. Maybe your scanner tends to make everything a little more yellow than you want. After you determine the settings that correct one picture perfectly, you can save those settings and then load them each time you want to apply them to another picture.

SAMS Teach Yourself Adobe® Photoshop® CS2 in 24 Hours [Electronic resources] نسخه متنی

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