2. Red Green Blue (RGB)

3. Colour conversions

4. Y and RGB Link In the images, the lighter the colour intensity (Red, Green, Blue), the more the contribution it has.

5. Colour Image Capture and Conversion

6. Graphics Elements Key elements of an image are: The picture resolution. This is defined by the number of pixels in the x- and y-directions. The number of colors per pixel. If N bits are used for the bit color then the total number of displayable colors will be 2 N. For example, an 8-bit color field defines 256 colors, a 24-bit color field gives 2 24 or 16.7M colors. Most computer systems allow for 32-bit color, which gives over 4 billion colors. Palette size. Some systems reduce the number of bits used to display a color by reducing the number of displayable colors for a given palette size.

7. Image Resolution

8. Graphics Formats

9. Graphics file magic numbers Description Extension Magic Number Adobe Illustrator.ai 25 50 44 46 [%PDF] Bitmap graphic.bmp 42 4D [BM] JPEG graphic file.jpg FFD8 JPEG 2000 file.jp2 0000000C6A5020200D0A [....jP..] GIF graphic file.gif 47 49 46 38 [GIF89] TIF graphic file.tif 49 49 [II] PNG graphic file.png 89 50 4E 47.PNG Photoshop Graphics.psd 38 42 50 53 [8BPS] Windows Meta File.wmf D7 CD C6 9A PDF Document.pdf 25 50 44 46 [%PDF] Link [00000000] 89 50 4E 47 0D 0A 1A 0A 00 00 00 0D 49 48 44 52.PNG........IHDR [00000016] 00 00 00 F3 00 00 00 C3 08 06 00 00 00 57 8C 27.............W.'

10. Sample Compression Rates

11. Compression with highly redundant information

12. GIF Colour Table

13. GIF File Format Link

14. LZW Compression R G B R R B G R R G B B G G R R LZW Table Entry Colour 0 Red 1 Blue 2 Green 3 Black 4Red, Green 5 Green, Blue 6 Blue, Red 7 Red, Red 8 Red, Blue 9 Blue, Green 10 Green, Red 11 Red, Red, Green 12 Green, Blue, Blue 13 Blue, Green, Green 14 Green, Red, Red