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Understanding the Grayscale Color Mode
The grayscale color mode utilizes an 8-bit pixel (8 on/off light switches) to generate 1 black, 1 white, and 254 shades of gray. Although scanning and working on old black and white images might seem the obvious reason for using the grayscale color mode; the speed and power of Photoshop, combined with faster computer systems, has prompted most photo restorers to switch to the RGB color space because of its greater versatility, and it's ability to generate millions of colors (or shades of gray). Yet despite the move to RGB, the grayscale color mode is still used extensively on black and white images, where file size is a consideration (grayscale images are 2/3rds smaller than RGB), and where output to rag style papers, such as newsprint, lack the ability to produce the detailed information available with RGB.
Convert an Image to Grayscale
Open an image.
Click the Image menu, point to Mode , and then click Grayscale .The image is automatically converted into the grayscale color mode.[View full size image]
Did You Know?You can colorize a grayscale image. Convert the image into the RGB mode, and then select a color, brush, and brush size on the Options bar. The trick is to change the blending mode of the brush on the Options bar to Color. Then, as you paint on the image, the selected color will replace the original grays. |
For Your InformationColorizing a Grayscale Image If you're planning on colorizing a grayscale image, you can increase your control of the image by creating a layer directly above the image layer, and painting in the new layer. Leave the blending mode of the brush at Normal, and change the blending mode of the new layer to Color. When you paint, the color is applied and controlled in the new layer, and you have the additional option of using layer opacity to control the intensity of the effect. |
