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How To Correct One Problem Color

 

Let’s say you have an image, but the sky doesn’t look as vibrant as you’d like, and you want to increase the amount of blue without affecting the rest of the image. Try this on for size: Open an image that contains a daylight sky. Click on the Create New Adjustment Layer pop-up menu at the bottom of the Layers palette. In the pop-up menu, choose Color Balance. In the Color Balance dialog, drag the Blue slider all the way to the right (it looks bad now, but trust me) and click OK. Now, press B to switch to the Brush tool. Press the letter X until your Foreground color is black, and with a large, soft brush, start painting over the areas you don’t want blue. As you paint, the blue Color Balance you added is painted away. The sky is much bluer, but you can paint away the added blue from the other areas. To really see the before/after difference, click the Eye icon next to the adjustment layer.

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How To Use RGB Filters On Grayscale Images

If you’re working on grayscale images, you’ll find there are some Photoshop filters that won’t work (they’re grayed out, so you can’t access them). Of course, it’s always the really cool filters, such as Lens Flare and Lighting Effects, that are grayed out. But don’t be dismayed (in fact, be “mayed”) because you can still use those filters—just switch to RGB mode (it’s found under the Image menu, under Mode), apply the filters, then switch back to Grayscale mode. It won’t affect the color of your image because, well, there is no color—you’re working on a grayscale image. Switching to RGB doesn’t suddenly pour color onto your image; your grayscale image will still look grayscale in RGB. When you switch back to Grayscale mode (after applying the filters), you’ll get a warning asking, “Discard color information?” You can safely click OK, because after all, there was no color to begin with.

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