Chapter 2 - Viewing and Managing Documents

Different Colour Modes

Colour Mode also known as Colour Space or Colour Model

The Colour that is seen by the human eye is called the Visible Specturm

A gamut is the range of colours that can be produced by a process or device. 

Colour Modes in Photoshop

Photoshop uses a list of Colour Modes :-

1. RGB Mode aka Red Green Blue(Making Millions of Colours available)
2. CMYK Mode aka Cyan Magenta Yellow and Black (The 4 Printer Colours)
3. Index Mode (Allowing for 256 Colours)
4. Grayscale Mode (Allowing for 256 Greys)
5. Bitmap Mode (2 Colours - Black or White)

Correcting Mistakes Using History Palette

If the History Palette is not open : Go to the Windows Tab, On the drop down menu Click "History"

Unlike Undo and Redo, The History Palatte lets you go back to an older state of the image and actively compare between two different states, 

Manipulating an On-Screen Image Size

By going to the "Image" tab and clicking "Image Size" you will get the window shown above, This will allow you to change the number of pixels in your document as well as the size of the document,