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Using the Threshold and Posterize Adjustments
The Threshold adjustment splits an image into black and white, based on the original brightness levels of the pixels. It's useful for locating the darkest and lightest pixels in an image, or for creating some great looking black and white special effects. The Posterize adjustment creates a simpler image by reducing the number of colors. It's useful for creating an image with a clipart look, or for reducing the number of colors in preparation for the Web.
Use the Threshold Adjustment
Open an image.
Click the Image menu, point to Adjustments , and then click Threshold .
Drag the Threshold slider to the right or left to change the point in which black and white are defined.For example, setting the threshold slider to a value of 75 creates an image where all pixels with a brightness value of 75 or less are black, and all pixels with a value of 76 or higher are white.
Click OK .
Use the Posterize Adjustment
- Open an image.
- Click the Image menu, point to Adjustments , and then click Posterize .
- Enter a Levels value (2 to 255) to define the number of colors used.Lower values produce less colors, and more visual contrast.
- Click OK .
