Channels in Photoshop (Basic Computer)

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Channels in Photoshop : Channels are the other way of colors. Each the a image has one or more a channels, the number depending on the color mode screen. CMYK has four separate channels plus a composite. RGB mode has three separate channels, plus a composite. Each channel holds information about a particular color element in the image. The individual channels of something like the plates in the printing process, with the separate plate supplying each layer of color.

Channels in Photoshop
  • RGB MODES:-

Select Image > Mode > RGB color to define the mode of an image as RGB. A large prospective of the visible spectrum can be represented by mixing Red color, Green and Blue colored light in various proportions. These colors are also called additive colors as they combine to form white. Adding all color together creates white-that is, all light is reflected back to the eye. Pure green has red and blue values, of 0 and a green value of 255.

  • CMYK:-

Select Image > Mode > CMYK color to define the mode of an image as CMYK. This model isused for printing, defines colors according to their percentage of Cyan, Magenta, Yellow and Black. The CMYK model is based in the light-absorbing quality of ink printed on paper. Pure cyan, magenta, yellow pigments should combine to absorb all color and produce black. For this reason these color are called subtractive color. Because all printing inks contains some impurities, these three inks actually produce muddy brown and must be combine with black ink to produce true black. Combining these inks to reproduce color is called four color process printing.

Resolution in Photoshop

Resolution refers to the number of dots-of-ink-per-inch or pixels-per-inch. Dpi is consider in printing and pixels-per-inch is consider at computer screen. It is important because the resolution of the image determine the quality. Here resolution gives you better quality image but uses more memory. Most images in the print have a resolution of 150 dpi to 300 dpi. On the computer screen you have the dpi of 72, which is substantially lower.

Color modes

The first thing to know is that Photoshop address color in terms of models and modes. Models are methods of defining color. Modes are the methods of working with color based on the models.

Photoshop has the option of color picker. It can be used by clicking the large blocks of color at the bottom of the toolbar. It has a graduated block of color, which can be clicked to select a particular shade, and fields that display the numbers for any chosen color in each of the four-color models. In addition, Photoshop also provides a facility of color palette. It has strip along the bottom that covers the full color spectrum, plus black and white.

Color modes describe the different ways that color can be represented on paper and on computer screen. The color models are as follows:-

  • RGB(Red, Green, Blue)
  • CMYK( Cyan, Magenta,Yellow,Black)
    • HSB(Hue, Saturation, Brightness)
    • CIE(L*A*B)
  • RGB MODES:-

Select Image > Mode > RGB color to define the mode of an image as RGB. A largeprospective of the visible spectrum can be represented by mixing Red color, Green and Blue colored light in various proportions. These colors are also called additive colors as they combine to form white. Adding all color together creates white-that is, all light is reflected back to the eye. Pure green has red and blue values, of 0 and a green value of 255.

  • CMYK:-

Select Image > Mode > CMYK color to define the mode of an image as CMYK. This  model is a used for printing, defines colors according to their percentage of Cyan, Magenta, Yellow and Black. The CMYK model is based on the light-absorbing quality of ink printed on paper. Pure cyan, magenta, yellow pigments should combine to absorb all color and produce black. For this

Reason these color are called subtractive color. Because all printing inks contains some impurities, these three inks actually produce muddy brown and must be combine with black ink to produce true black. Combining these inks to reproduce color is called four color process printing.

  • HSB:-

The HSB models describe three fundamental feature of color:-

  1. H stands for HUE. It is the color reflected from an object. It is measured as a location on the standard color wheel, expressed as a degree between 0 or 360. in common use, Hue is identified by the name of color such as red, orange or green.
  • Stands for saturation. It is also called Chroma, is strength or purity of color. The Saturation represents the amount of gray in proportion to the hue, measured as a percentage from 0% (gray) to 100% (fully saturated). On the standard color wheel, saturation increases form the center to the edge.
  • B stands for Brightness. It is the relative lightness and darkness of the color, usually measured as a percentage from 0% (black) to 100 %( white).
  • CIE:- Select image > mode > LAB color to define the mode of an image as lab. The mostencompassing of these color in models is CIE lab. It defines a color gamut that is broader than any of the models. Photoshop in uses the CIE lab model to convert from one color model to another. Lab is defined as luminance, plus two components, which go, respectively, from green to red and from blue to yellow. Lab is designed to device – independent, means that the range of colors defined in this model is not restricted to the range that can be printed or displayed on the particular device.
  • COLOR MODES:-

The Photoshop modes are available under image > Modes are as follows:

  • Bitmap
  • Gray scale
  • Duotone
  • Indexed color
  • RGB color
  • CMYK color
  • Lab color

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