What is dpi, ppi ?
The image has two distinct ways of determining its size. Firstly the ‘size’ of each pixel is measured by how many pixels fit in an inch. Digital cameras generally shoot images at 72 ppi (72 pixels per inch) This is called the images ‘resolution’. This term is also referred to as dpi (a printers term meaning dots per inch). Secondly the Image has a physical size which is measured by the number of pixels for instance 2272w x 1704h. At a resolution of 72 dpi this image is 31.5inches by 23.6 inches, or 80cm by 60 cm. What is a Megapixel? A Megapixel is 1million pixels, so if we take our image of 2272 x 1704 we get 3,871,488 pixels which is nearly 4 Megapixels. What is file compression? JPEG vs RAW Most Digital cameras by default save the image as a JPEG file which uses a mathematical algorithm to reduce the physical size of the code inside the image file. Let me explain a little more. If you take a shot on your Digital camera with the setting set at ‘RAW’ your camera will create a much lar
