psd A .psd extension file is an image file created with the help of Adobe Photoshop. PSD is the default extension used for saving a Photoshop Image which can have either a single or multiple layers which can be worked individually even after having saved the file. The file can also be saved in other formats like .jpg, .tiff, .gif or other imaging formats but if a user wants to edit the individual layers later, it is necessary to save the .psd file without overwriting it while converting it to another format. Converting a .psd extension file into an image file in another format flattens the image so that it can be viewed as a regular image. The images created using this extension are of a very high resolution and the quality in terms of clarity is extremely good as compared to other commonly used image formats like .jpg, .png or .bmp.
gif The .gif filename extension refers to the GIF graphical file format created by CompuServe in 1987. The format is from the class of raster graphics which uses a dot matrix type data structure of orthogonally placed pixels, each with their own color information. The file format has a rich history of usage in storing sprite data for video games especially those released in the early 90's. The GIF format has also been used in low-resolution animation clips distributed over the internet, and in design of sharp-edged art that utilize a palette of a few colors up to a max of 256 colors. The GIF file format has its advantage in its compression technique, which limits file size but does not compromise image quality. The file format natively opens on many of the popular web browsers.