Psd = Photoshop Data
Adobe Photoshop, or simply Photoshop, is a graphics editing program developed and published by Adobe Systems.
Ai = Adobe Illustrator
A CS4 software is a comprehensive vector graphics environment with new transparency in gradients and multiple artboards that invite you to explore more efficient ways to design.
Indd = Adobe Indesign
A CS4 software breaks down the barriers between online and offline publishing. Create compelling print layouts, immersive content for playback in the Adobe Flash® Player runtime, and interactive PDF documents.
Jpg = Joint Photographic Experts Group
Pronounced jay-peg. JPEG is a lossy compression technique for colour images. Although it can reduce files sizes to about 5% of their normal size, some detail is lost in the compression, usually done so the information can get transferred to the web.
Gif = graphics interchange format
Similar to Jpeg, Gif is also used mostly for the Web but the can only compress the image a limited amount of colours which is about 256 colours but is more effective for scanned images such as illustrators, not so much photos
Png = Portable Network Graphics
Pronounced ping, a new bit-mapped graphics format similar to GIF meant to replace the older format being GIF.
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