Published on July 20, 2014
IMAGE FILE FORMATS: IMAGE FILE FORMATS Why Using Different Image Formats?: Why Using Different Image Formats? Simply by navigating on the Internet, you see how many image formats are available to you: BMP, GIF, JPEG, PNG, RAW, SVG, TIFF, . . .You can directly store an image of this kind on your hard disk, with- out thinking about the size it could take, or the further use(s) of this image. PowerPoint Presentation: A recurrent problem is that people do confuse these formats, and their specific properties, resulting in inappropriate image encoding choices, and unusual behavior. Classification: Classification We can categorize image formats in two categories: Raster and vector . PowerPoint Presentation: Raster Images These formats store images as bitmaps (also called “ pixmaps ”). Briefly, a raster graphics image or bitmap is a data structure representing a generally rectangular grid of pixels, or points of color. The main problem of the raster image format is that the graphics are resolution-dependent. PowerPoint Presentation: Because of this, a raster image cannot be scaled to a higher resolution (than the original one) with- out a given loss of quality. Depending on the desired image resolution, a loss of apparent quality is often observed. Some kinds of raster images are BMP, GIF, JPEG, PNG, RAW, TIFF. PowerPoint Presentation: Vector Images These formats store images as vectors. We know that a vector is defined by three main properties: a direction, a magnitude, and a sense. T hus , vector image formats contain a geometric description which can be rendered smoothly at any desired display size , although these files do not have a big size. PowerPoint Presentation: . Vector file formats can contain bitmap data as well. Some kinds of vector images are CGM, EPS, SVG. PowerPoint Presentation: People must be aware of the different image formats, and their main properties, to enjoy a maximum the digital Computer-Assisted Publication (C-AP).