#2 Display and Graphics

• IPhone Screen : 320 x 480 points
• IPhone 4 has scaling factor of 2 (to get real resolution of IPhone 4 device in pixels, multiply above points with the scaling factor, 320 x 2 and 480 x 2 pixels)
• iOS Automatically scale your application to highest resolution using scaling factor for the device 

• What is Pixel ?

1. Abbreviation of "Picture Element"
2. Color image pixel composed of RGB (Red[0-255], Green[0-255], Blue[0-255])
3. Smallest controllable element on screen
4. Smallest component of the digital image
5. More pixels more closer to real image
6. For example, 640 (width) x 480 (height) Pixels = 307,200 pixels (0.3 megapixels)

• What is Resolution ?
1. Pixel or Dots per image and bits of pixels (more bits more colors)
2. VGA 640 x 480 = 0.3 megapixels
3. SVGA 800 x 600 = 0.48 megapixels
4. True Color use 24 bits per pixel to allow 16 million different colors