Lecture 2 & Chapter 2: Viewing and Managing   Documents 

      
      Firstly, in this chapter i learned how to correct mistake using history palette,you can undo multiple commands using the History palette and the History palette lists recently executed commands with

                                  

Secondly, i learned how to  convert images to different color modes, all colors that can be seen by the human eye are called the visible spectrum, and the range of colors that can be produced by a process or device is called the gamut. Their are three types of color mode, RGB, CMYK and pantone. RGB are addictive color mode which contains RED, GREEN and BLUE and they are used for displaying monitor colors. CMYK are subtrative color mode which contain cyan, magenta, yellow and black and are used as printing ink. Pantone color mode are types of color mode used for industrial purposes.

                             

        Thirdly, i learned how to manipulate the size of an image, you can change the size at which an image displays on your computer monitor so that users can see the entire image. and to change the on-screen image size, click Image > Image Size.