Graphics and Color

• Hex nostalgia, on encoding 1-bit pixels

• The X Bitmap format and an example:

  #define xlogo16_width 16
  #define xlogo16_height 16
  static unsigned char xlogo16_bits[] = {
     0x0f, 0x80, 0x1e, 0x80, 0x3c, 0x40, 0x78, 0x20, 0x78, 0x10, 0xf0, 0x08,
     0xe0, 0x09, 0xc0, 0x05, 0xc0, 0x02, 0x40, 0x07, 0x20, 0x0f, 0x20, 0x1e,
     0x10, 0x1e, 0x08, 0x3c, 0x04, 0x78, 0x02, 0xf0};

• Icon examples from 9/19 class (XBitmap on left, regular order on right.)

• Additive color
• Color depth
• 4-bit color demo
• 24-bit color demo

• Pixels in the BAM sign – full image · zoomed in

• Similar subpixelization of an image, just like the BAM sign.

  

  Original Bart

  Click on Subpixelized Bart and zoom in with control-plus. You’ll see that the yellow regions of the image are made up only of red and green lights.

• What the hex color guessing game

Steganography

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