JPG files, also known as JPEG files, are a common file format for digital photos and other digital graphics. WhenJPG files are saved, they use "lossy" compression,meaning image quality is lostas file size decreases. JPEG stands for Joint Photographic Experts Group, the committee that created the file type. JPG files have the file extension .jpg or .jpeg. They are the most common file type for images taken with digital cameras, and widely used for photos and other graphics used on websites.
http://graphicdesign.about.com/od/Definitions/g/Jpg-Files.htm
TFF
A TIFF file, or TIF file, stands for Tagged Image File Format. TIF files are a common file format for images, especially those used on graphic design. The file extension for a TIFF file is either .tiff or .tif.TIFF files can be saved without compression, or they can be compressed to lower file size, similar to JPG files. TIFF files are commonly used in print design and desktop publishing because they can store large, high quality images such as photos. Often, printers will prefer or require TIFF files over JPG images or other formats.
http://graphicdesign.about.com/od/Definitions/g/Tiff-Files.htmPNG
PNG (pronounced ping as in ping-pong; for Portable Network Graphics) is a file format for image compression that, in time, is expected to replace the Graphics Interchange Format (GIF) that is widely used on today's Internet. Owned by Unisys, the GIF format and its usage in image-handling software involves licensing or other legal considerations. (Web users can make, view, and send GIF files freely but they can't develop software that builds them without an arrangement with Unisys.) The PNG format, on the other hand, was developed by an Internet committee expressly to be patent-free. It provides a number of improvements over the GIF format.Like a GIF, a PNG file is compressed in lossless fashion (meaning all image information is restored when the file is decompressed during viewing).
http://searchsoa.techtarget.com/definition/PNGBMP
BMP
A bit map does not need to contain a bit of color-coded information for each pixel on every row. It only needs to contain information indicating a new color as the display scans along a row. Thus, an image with much solid color will tend to require a small bit map.
Because a bit map uses a fixed or raster graphics method of specifying an image, the image cannot be immediately rescaled by a user without losing definition. A vector graphics graphic image, however, is designed to be quickly rescaled. Typically, an image is created using vector graphics and then, when the artist is satisfied with the image, it is converted to (or saved as) a raster graphic file or bit map.
http://whatis.techtarget.com/definition/bit-map
PSD
A PSD file is a layered image file used in Adobe PhotoShop. PSD, which stands for Photoshop Document, is the default format that Photoshop uses for saving data. PSD is a proprietary file that allows the user to work with the images’ individual layers even after the file has been saved.
When an image is complete, Photoshop allows the user to flatten the layers and convert the flat image into a .JPG, .GIF, .TIFF or other non-proprietary file format so it can be shared. Once a PSD image has been flatten by conversion, however, it cannot be converted back to PSD and the user can no longer work with the image's layers. It is important, therefore, so always save the .PSD file and not overwrite it during conversion.
http://whatis.techtarget.com/fileformat/PSD-Adobe-Photoshop-default
AI
Adobe Illustrator is a program used by both artists and graphic designers to create vector images. These images will then be used for company logos, promotional uses or even personal work, both in print and digital form. So what is Adobe Illustrator used for? It is typically used to create illustrations, charts, graphs, logos, diagrams, cartoons of real photographs, and more. While the program may be difficult to understand initially, the final product will be well worth the learning curve.
https://www.udemy.com/blog/what-is-adobe-illustrator-used-for/
WMF
In Windows, a metafile is a file that contains information regarding one or more other files. Called a Windows Metafile Format (WMF), it is commonly a graphics file format, containing information for vector graphics or bitmap files. The WMF contains a list of function calls that Windows uses in its Graphics Device Interface (GDI) layer to display images on a computer monitor.
http://www.computerhope.com/jargon/w/wmf.htm
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