Color

What we will learn

• Histogram
• Image Modes and Channels
• Applying Color Fills

Histogram

• Histogram is a graph showing the number of pixels used in the image for a given color or intensity.
• To view the Histogram go to Image > Histogram
  
  
• The Histogram Screen will open up
  

Image Modes and Channels

• Go to Image > Mode and you can select variety of mode from there
  
• Let us view this picture in different modes
  
• Open up the Channels Palette and click the channel you want to view
  

• RGB Mode: Pixels are recoded as a combination of red, green, blue color values

Red Channel

Green Channel

Blue Channel

• CMYK Mode:Pixels are recorded as a combination of Cyan, Magenta, Yellow and Black (K) color values

Cyan Channel

Magenta Channel

Yellow Channel

Black Channel

• Lab Mode:Pixels are recorded by their Lightness value and color values on a green-red axis (the 'a' axis) and the blue-yellow (the 'b' axis) scale

Lightness Channel

A Channel

B Channel

Applying Color Fills

• Select the portion you want to apply the color with the selection tools
  
• Choose a foreground color
  
  
• Go to Edit > Fill
  
• The Fill Screen will open up
  
• Choose Foreground Color in the Contents > Use
• Choose an opacity percentage if you want a bit of transparency and press OK
  
• Press Ctrl + D to Deselect the selected area
                         
  Opacity 100%                                                Opacity 50%

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