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File Format Help Sheet 2

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File Format Help Sheet 2
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  File extension : .jpg Name : Joint   Photographic   Experts   Group Raster vector : Raster Advantages :  JPEG is widely supported and is standard for both digital photography and the Internet. Its variable compression allows you to c0hange the file size easily. Disadvantages : JPEG is not suitable for simpler pictures that contain few colours or broad areas of similar colour or stark differences in brightness. There is some loss of quality when a file is compressed. Examples : JPEGs are used when sending email as it helps to make an image smaller to email or digital photography. File extension : .tif Name : Tagged Image File Format Raster vector : Raster Advantages :  TIFF is widely supported and is standard on many computers and is often used when scanning images or work pages. Both Mac and Windows computers support it. Disadvantages :  web browsers don’t support TIFF.  It also does not compress automatically so it creates a large file size. Examples : TIFF is usually used to scan in sketches within this line of  work. File extension : .png Name : Portable Network Graphics Raster vector : Raster Advantages :  PNG is a platform-independent format. It supports high-level lossless compression and transparency. More recent web browsers support PNG. Disadvantages : Older browsers and programs may not support PNG. Offers no support for animated files. Examples : creating logos for websites with transparent backgrounds. File extension : .bmp Name : Window Bitmap  Raster vector : Raster Advantages :  Supports a wide range of colour. The BMP format is widely compatible with existing Windows programs, especially older programs. Disadvantages : BMP does not support compression, which results in  very large files. Web browsers do not support BMP files. Only used by windows computers. Examples : If you work in an office with windows computers then BMP is probably used. File extension : .gif Name : Graphics Interchange Format Raster vector : Raster Advantages :  GIF is a widely supported Internet standard. It has lossless compression and transparency.  Animated GIF. Disadvantages : There is a maximum of 256 colours therefore detailed pictures and photo realistic images loose colour information. Lossless compression and transparency are limited and inferior to other formats. Examples : Creating a moving logo for a web page. File extension: .psd Name: Photoshop Document Raster vector: Raster Advantages:    Allows   images   to   be   stored in layers. Can be imported into other software programs, such as after effects and titles.  You can also create and manipulate vector graphics. Disadvantages: Is a very large file so will need to be saved as a smaller file if you want to share it. Does not work with all programs. The vector graphics function is limited and more a specialized software may be more useful. Examples: Creating images from scratch. File extension: .cgm  Name: Computer Graphics Metafile Raster vector: Both Advantages:   Free file format which works on many systems. International standard. Disadvantages: In some programs it needs a filter to convert it. Examples: If a company is in another country they can still access the  work being produced. File extension: .pdf Name: Portable Document Format Raster vector: Both Advantages:   Can be opened on any system Small file size is easy to share. Nobody else can edit it. Disadvantages: Cannot manipulate images once they are saved to this format. Examples: Put examples of past work on the Internet where no one can manipulate the image.   Raster Graphics   Raster graphics use pixels to store the data.   Each square is a pixel. One pixel contains one bit of data.   If you zoom into a raster file you will see lots of pixels making up the images.   Cameras and scanners will produce work in raster files, so they  will need to stay as raster file when being edited.   Vector Graphics    Vector graphics use mathematic equations (points, lines, curves, shapes or polygons) to store the data.    Vector graphics will stay perfect quality no matter how far you zoom in.   Raster graphics will often be turned into vector graphics for printing, because it is so easy to resize without changing quality.   Not all computer programs support all types of vector graphics. So if you want to work in many different programs you would be better to save as a more universally compatible raster file.
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