Color Modes
Color ModesWhenever you are working in Photoshop, you are working in a color mode. The default mode is RGB (Red-Green-Blue), which is also the default mode for the Web. If you are only working to create color images for the Web or for a desktop inkjet printer, you may not need to use any of the other modes. But it is useful to know about modes because this gives you a better idea of how Photoshop creates images.
Each color mode defines the colors that combine to make up the color of every pixel in the image. To change color modes, choose Image > Mode.
Color modes are made up of channels. Each channel is a grayscale image. A grayscale image is an image made up of shades of brightness (as many as 256 shades, from white to black). To view the channels, choose Window > Channels, and the Channels palette will appear. Modes with fewer channels result in smaller file sizes.
For example, in RGB mode, the red channel is a grayscale image made up of brightness values for the color red; the green channel is made up of brightness values for the color green; and the blue channel is made up of brightness values for the color blue. Each pixel in the full color image is made up of a combination of of brightness values for red, green, and blue.
Note: It is possible to edit an individual channel, which is useful to improve the quality of some images. Detailed techniques for working with channels are beyond the scope of this tutorial. For more information refer to one of the resources listed in the Welcome section.
Some of the most frequently used color modes are:
RGB mode
Grayscale mode
One channel, 256 shades of gray
Bitmap mode
Indexed mode
CMYK mode
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Color ModesWhenever you are working in Photoshop, you are working in a color mode. The default mode is RGB (Red-Green-Blue), which is also the default mode for the Web. If you are only working to create color images for the Web or for a desktop inkjet printer, you may not need to use any of the other modes. But it is useful to know about modes because this gives you a better idea of how Photoshop creates images.
Each color mode defines the colors that combine to make up the color of every pixel in the image. To change color modes, choose Image > Mode.
Color modes are made up of channels. Each channel is a grayscale image. A grayscale image is an image made up of shades of brightness (as many as 256 shades, from white to black). To view the channels, choose Window > Channels, and the Channels palette will appear. Modes with fewer channels result in smaller file sizes.
For example, in RGB mode, the red channel is a grayscale image made up of brightness values for the color red; the green channel is made up of brightness values for the color green; and the blue channel is made up of brightness values for the color blue. Each pixel in the full color image is made up of a combination of of brightness values for red, green, and blue.
Note: It is possible to edit an individual channel, which is useful to improve the quality of some images. Detailed techniques for working with channels are beyond the scope of this tutorial. For more information refer to one of the resources listed in the Welcome section.
Some of the most frequently used color modes are:
RGB mode
- three channels (Red, Green, and Blue)
- used by all monitors and by the Web
- recommended by Adobe for editing color images
Grayscale mode
One channel, 256 shades of gray
Bitmap mode
- black and white (no shades of gray)
- used for line art
Indexed mode
- one color channel, up to 256 color values
- used for GIF images destined for the Web
CMYK mode
- four channels (Cyan, Magenta, Yellow, Black)
- used by professional printing houses. If you are producing a images for a publication or poster, you may need to save it in CMYK mode.
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