Image File Format Definitions PSD: Adobe Photoshop Document Scaling up a lower resolution file will result in a loss of quality. This means that the original file must be at least 300 DPI from the outset. In this case the image must be supplied high-resolution - at a minimum of 300 DPI (dots per square inch), actual size.
If the image has been created using a paint program such as Adobe Photoshop, or if it is a scanned photograph, it is a bitmap image and is resolution-dependent. Image File Format Definitions TIFF or TIF file format: Tagged-Image File Format fileĪ TIFF is a bitmap image format. All bitmap images must be provided in either 'grayscale' or 'CMYK' (Cyan Magenta Yellow Keyline) colour formats. However, if the image has been created using a paint program such as Adobe Photoshop, or if it is a scanned photograph, it is a bitmap image and is resolution-dependent. Whenever possible, it is best to supply graphics as vector images. If the image has been created using paths in a program such as Adobe Illustrator or Macromedia Freehand, it is a resolution-independent vector image and can be scaled to any size without losing quality. Image File Format Definitions EPS file type and AI: Encapsulated PostScript file / Adobe Illustrator fileĮPS language file format can contain both vector and bitmap graphics. As a result, vector graphics are the best choice for type (especially small type) and bold graphics that must retain crisp lines when scaled to various sizes - for example, logos. You can move, resize, or change the colour of the windmill without losing the quality of the graphic.Ī vector graphic is resolution-independent - that is, it can be scaled to any size and printed on any output device at any resolution without losing its detail or clarity. For example, a windmill drawn as a vector graphic is made up of a mathematical definition of shapes drawn with a certain height and width, set at a specific location, and filled with a specific colour. Vectors describe graphics according to their geometric characteristics. Image File Format Definitions Vector Graphics ( EPS file type, Adobe Illustrator AI, files)ĭrawing programs such as Adobe Illustrator create vector graphics, made of lines and curves defined by mathematical objects called vectors. As a result, they can appear jagged and lose detail if they are scaled on-screen or if they are printed at a higher resolution than they were created for. This means that they represent a fixed number of pixels. Raster images are the most common electronic medium for continuous-tone images, such as photographs or images created in painting programs, because they can represent subtle gradations of shades and colour. When working with bitmap images, you edit pixels rather than objects or shapes. For example, a windmill in a bitmap image is made up of a collection of pixels in that location, with each pixel part of a mosaic that gives the appearance of a windmill. Each pixel in a bitmap image has a specific location and colour value assigned to it. The images use a grid of small squares, known as pixels, to represent graphics. Paint and image-editing software, such as Adobe Photoshop, generate bitmap images (not to be confused with the Photoshop Bitmap color mode), also called raster images. Image File Format Definitions Raster (Bitmap) Graphics ( TIFF or TIF file format, EPS file type, Photoshop PSD files) see a simplified version of Adobe's definitions below. Vector graphics are created using Bezier curves. These images are resolution-dependent, meaning that their physical size is directly associated with their resolution (the number of Dots (pixels) per Square Inch or DPI that they contain). Raster images are generally photographs or images made up of pixels. Raster (or bitmap) images and vector images. There are two image main image file format definitions used in a typical graphic design project. Image File Format Definitions for Prepress Preparation
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