I really have to catch up on my blogging! Anyway, we've started a new unit on Photoshop during the last couple of classes. The following is just a collective of notes and information: DPI stands for Dots Per Inch. The most common size for photographs is 4 inches by six inches. A megapixel is a million pixels. The Additive and Subtractive theory is about the three main colors of light>RGB (red, green, and blue) and the four colors used in ink>CMYK (cyan, magenta, yellow, and black which is also know as K). In computer resoultion, we use 300 DPI but when we put it on the interent it has to be 72 DPI. The less DPI a picture has, the less space it will take on your computer;less information. You could use large amounts of DPI if you were to scan something, or if you were a professional photographer. Once something is compressed, it will lose information and that information can never be regained. In fact, when you try to recover the information on Photoshop the picture will become blurry. JPEG is bad for professional photograpphers, because every time you change that file it will lose informatiom; thereby gaining the title of being a "lossy" file. If a file never loses information, then it is considered "lost-less". Examples of "lost-less" files would include PSD, TIF (Tagged Image Formats), and Bitmap (BMP) files. An average person uses only 6-8 megapixels, and a 24 megapixel camera would therefor be useless. Camera phones are bad because even if they have a lot of megapixels, their senses are just too small to capture enough light and the picture properly (gaining you a lower quality).