Bedienungsanleitung Adobe Photoshop CC - 2015 (Seite 140 von 859) (Englisch)

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Image and color basics

Last updated 11/30/2015

Color channels

Every Photoshop image has one or more channels, each storing information about color elements in the image. The

number of default color channels in an image depends on its color mode. By default, images in Bitmap, Grayscale,

Duotone, and Indexed Color mode have one channel; RGB and Lab images have three; and CMYK images have four.

You can add channels to all image types except Bitmap mode images. For more information, see

Color modes.

Channels in color images are actually grayscale images that represent each of the color components of an image. For

example, an RGB image has separate channels for red, green, and blues color values.

In addition to color channels, alpha channels, can be added to an image for storing and editing selections as masks, and

spot color channels can be added to add spot color plates for printing. For more information, see

Channel basics.

Bit depth

Bit depth specifies how much color information is available for each pixel in an image. The more bits of information per

pixel, the more available colors and more accurate color representation. For example, an image with a bit depth of 1 has

pixels with two possible values: black and white. An image with a bit depth of 8 has 2

, or 256, possible values. Grayscale

mode images with a bit depth of 8 have 256 possible gray values.

RGB images are made of three color channels. An 8-bit per pixel RGB image has 256 possible values for each channel

which means it has over 16 million possible color values. RGB images with 8-bits per channel (bpc) are sometimes

called 24-bit images (8 bits x 3 channels = 24 bits of data for each pixel).

In addition to 8-bpc images, Photoshop can also work with images that contain 16-bpc or 32-bpc. Images with 32-bpc

are also known as high dynamic range (HDR) images.

Photoshop support for 16-bit images

Photoshop provides the following support for working with 16-bpc images:

• Working in Grayscale, RGB Color, CMYK Color, Lab Color, and Multichannel modes.

• All tools in the toolbox, except the Art History Brush tool, can be used with 16-bpc images.

• Color and tonal adjustment commands are available

• You can work with layers, including adjustment layers, in 16-bpc images.

• Many Photoshop filters can be used with 16-bpc images.

To take advantage of certain Photoshop features, such as some filters, you can convert a 16-bpc image to an 8-bpc

image. It’s best if you do a Save As and convert a copy of the image file so the original file retains the full 16-bpc

image data.

Convert between bit depths

Do any of the following:

• To convert between 8 bpc and 16 bpc, Choose Image > Mode > 16 Bits/Channel or 8 Bits/Channel.

• To convert from 8 bpc or 16 bits to 32 bpc, choose Image > Mode > 32 Bits/Channel.

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