The Rule of Thirds

The rule of thirds is when you divide an image into thirds horizontally and vertically.
The rule of thirds is like an imaginary grid in 9 equal squares in the image.

PNG

PNG MEANS A PORTABLE NETWORK GRAPHICS

PNG CHARACTERISTICS: TRUE ALPHA SUPPORT, NO ANIMATION SUPPORT, COLOR DEPTH, TRUE COLOR, FULL 8-BIT ALPHA CHANNEL, AND 32-BIT COLOR

THE PROS FOR PNG IT HAS BETTER AND LOSSLESS COMPRESSION SCHEME THAN GIF,
IT HAS A SIMILAR VISUAL QUALITY OF "TRU COLOR" TO TIFF WITH A SLIGHTLY SMALLER FILE SIZE,
CAN HANDLE 8-BIT OR 16-BIT TRANSPARENCY, AND FREE FOR THE PUBLIC TO USE WITHOUT ANY COPYRIGHT RESTRICTIONS.

THE CONS FOR PNG IS THAT ITHAS NOT BEEN WIDELY ACCEPTED AND SUPPORTED BY THE PUBLIC AND VIEWING BROWSERS AND IS NOT A JPEG SUBSTITUTE BECAUSE THE LOSSLESS COMPRESSION SCHEME WILL YIELD A LARGER FILE SIZE EVEN THOUGH PNG SUPPORTS "TRUE COLOR".

THE DIFFERENCE BETWEEN PNG, GIF, AND JPEG IS THAT JPEGIS USED FOR COLOUR PHOTOGRAPHS, OR ANY PICTURES WITH MANY BLENDS OR GRADIENTS. THE GIF IS USED FOR TEXT, LINE DRAWINGS, SCREENSHOTS, CARTOONS, AND ANIMATIONS. AND PNG IS THE IMAGE FORMATS BUT IT IS NOT ALWAYS COMPATIBLE WITH ALL WEB BROWSERS OR IMAGE SOFTWARE.