SVG files are two-dimensional, XML based vector images. File previews may be TIFF or WMF files if they start with the four bytes containing the characters C5 D0 D3 C6, which produces a group of characters that looks vaguely like the word "Adobe." Other EPS files must begin with where the lowercase letters need to be one digit numbers. BoundingBox comments (found within the two DCS header comments) define the resolution and file size. In order to lay out the page with or without the ability to render the PostScript inside the file, the EPS file will contain a BoundingBox DSC comment giving information on the containing image within the EPS file. Early editions of Adobe Illustrator Artwork were based off of EPS files with DCS's Open Structuring Conventions. Along with the EPS file the user can send and receive a low resolution image preview within the document. The self-contained, DSC conforming PostScript documents enable the sending and receiving of graphics which can be placed within other PostScript documents. Due to the compatibility of an EPS file with all operating systems, this file extension is regularly used by publishers. Created by Adobe Systems in 1992, it is one standard format for the import and export of text and images. Conversion from PSD to other image types creates a compressed final product.ĮPS is short for Encapsulated PostScript. These proprietary file types are larger, but serve as working documents for graphic design projects. Individual layers are saved as opposed to the image as a whole being saved. PSB files are similar to PSD files but can only support images with height and width up to 300.000 pixels with a length limit of 4 exabytes. Some of these editing options include: masks, transparency, duotone settings, gradients, color balance, blending, clipping paths, and more. Photoshop files under the PSD file extension store the image while allowing for support of various editing options throughout the Adobe Photoshop programs. These files are often used as work-in-progress documents, not for final production and distribution of an image. When saved under the PSD file extension the layers are saved, viewable, and can be edited. Once converted from a PSD to another file type, all layers blended into one single layer. PSD files can be opened by various Photoshop programs and they can be flattened to other image formats (PNG, JPEG, GIF, etc) for uploading, sending and saving. Layers allow elements to be added and removed easily as well as different filters, effects, transparencies, and more to affect to be applied to an image. PSD files allow graphic designers, producers, and other users to edit images using layers. Fewer colors lead to more efficient compression of the file. The 2 minimum colors needed for a GIF image are black and white. The maximum available colors is 256 but it can have as few as 2. The number of colors needed in the image is reduced by removing the colors not being used in the image. The raster data is compressed to the minimum file size.
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The 256 colors per GIF image is capable of using the LZW (Lempel Zev Welch) form of file compression which removes the inefficient sections of data to reduce the decrease of quality of the image and ensure a better quality image. This allows the file to be converted to another file type without excessive loss of quality.Ĭompuserve created the GIF (Graphics Interchange Format) for online use and made the information available to the public. Compression for GIF files is lossless so the size is reduced without changing the quality.
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Not all GIF images are animated many logos and images with sharp, defined lines and edges, and a transparent background utilize the GIF extension. This allows 256 colors in the 24-bit RGB color space. GIF files use bitmap images and allow up to 8 bits/pixel.
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GIF is the internet's favorite image file type due to its abilities to animate images.