file types lecture notes
- 1. Raster and vector Raster is made of bitmaps. Bit mats aregraphics thatare made of pixels,each pixel records colour. Bitmaps are images that have a fixed resolution.(likewhen Photoshop is setto 300dpi) When a camera mentions megapixels/bits itseparates the picture into. 14 megapixels = 14,000,000#Seperates images into millionsof tiny squares.(pixels) Vector graphics aremade of vectors. (Also known as paths and strokes) Vectors/ paths are defined by a startand an end points,with curves, points and angles between them. Can be scaled bigand small as vectors haveno loss in definition. Perfect for company logos – can be used in business cardsand billboards. JPEG Joint photographic experts group. Photographs and web formats. Photographs on Facebook are saved as jpeg. Loses quality with multipleedits due to compressions and recompression each time edited. Tiff Tagged image fileformat Desktop publishing.(popular in graphic design) Adobe InDesign documents saved as Tiffs can savea singletiff file. Tiffs have the option of lossless compression. Gif Graphics interchangeformat. Used for short digital animations,often on the internet. A series of images plays onceafter another in a loop to create the appearanceof a video. Bmp Bitmap image file. Similar to tiff and jpeg. No loss in compression.
- 2. Has a largefilesize. PSD Photoshop document. Image manipulation. Front covers of magazines. Saves layers,page formatting information,swatches E.C.T. Supports transparency. AI Adobe illustrator art. Logo creation. Graphic to represent a company. (logo) Can be scaled bigand small as vectors haveno loss in definition. FLA Flash file. Used to create a flash animation and games. Can be used to create high quality files and images. Can includesound and video. WMF Windows meta files. Similar to AI files. Used for logos. Can be scaled bigand small as vectors haveno loss in definition. Can contain both vector and bitmap compression. Compression Lossy compression is the way in which we reduce filesizes.This happens by the amount of information that is received. Images become more pixilated as they are compressed as they savesmaller amounts of pixels each time.
- 3. Image capture Graphics can becaptured in a variety of ways. Scanner You Cn digitisephysical images likesketches,physical photos or mixed media products. Digital camera takingimages Tablet A piece of technology that allows you to control easier than that of a mouse or a pen. Optimising Images that are uploaded to the internet are optimised to ensure easy viewing on the web. Images that are not optimised normally havea largefilesize,this leads to largedownload times. Images should notbe more than 500 pixels wide. Images can be optimised by: Reducing the images size Reducing the bit depth Bit depth refers in to amount of “bits” used regardingthe colour of the individual pixels.