Image File Formats LESSON 1.pptx PDF

# Image File Formats * **Are means of storing and organizing digital images, photos and illustrations** * **Classified into two types: raster image files and vector image files** ## Raster Image Files * **Raster Image/bitmap - means of representing digital images in bits of information for storag...

# Image File Formats * **Are means of storing and organizing digital images, photos and illustrations** * **Classified into two types: raster image files and vector image files** ## Raster Image Files * **Raster Image/bitmap - means of representing digital images in bits of information for storage, which translates into pixels when viewed on the screen.** * **Most of the raster files are lossy.** * **It is the common format you will encounter in the Internet and with many digital image files, such as those from digital cameras.** * **Stored in bit maps. Examples of this type are the** ### Pixel * **The word pixel comes from the words picture (pix) and element (el).** * **Is the smallest information of an image.** * **Images using pixels are usually represented in dots or squares that are arranged and added together to form the picture.** ## TYPES OF RASTER IMAGE FORMATS ### Bitmap Image (.bmp) * **An image file format developed and used on Microsoft Windows environment and is stored in a graphic file format called device-independent bitmap (DIB)** * **Has a file extension of .bmp or .dib** * **Not a common format on the World Wide Web because of its large file size.** ### Graphical Interchange Format (.gif) * **An image file format that is very popular on the World Wide Web because of its portability (small file size) and support for animation.** * **It is ideal for images with large areas of uniform color, small images, images with text, navigation buttons but it is not good to use for photographic images.** * **It supports only a small 8-bits per pixel color** ### JPEG Image (.jpg) * **Standardized by the Joint Photographic Experts Group (JPEG) is a common method for photographic images as well as transmission of photos on the World Wide Web since it supports 24-bits per pixel color scheme.** * **Many digital camera store photographs in JPEG format. JPEG is not ideal for use on line art.** ### Portable Network Graphic (PNG) * **A free, open-source bitmap image format made to improve on GIF which has small file but can handle more color since it supports 24-bit per pixel color scheme and supports true color (16 million colors).** * **Does not support animation.** * **Employs a lossless compression, meaning it does not loose the quality of the image despite successive editing.** ### Photoshop Document (PSD) * **A native file format for Adobe Photoshop, and since many are using this program to create images** * **Photoshop has the ability to read all of the above formats and edit them** * **It is very popular** ## Vector Image/ Vector Graphic Files * **Vector images are lossless files created using mathematical geometric equations to represent images in digital computer graphics.** * **Has the advantage of retaining its quality at any desired image size, unlike raster images that appear pixilated when displayed in expanded image sizes.** * **It is preferred format for those who desire quality prints and display images.** * **Examples of this type of format are: PDF, Encapsulated Postscript,** ## TYPES OF VECTOR IMAGE FORMATS ### Adobe Illustrator (.ai) * **Adobe Illustrator File is the extension for graphics created using Adobe Illustrator which is created using paths and lines connected by points instead of bitmaps, which may include objects, color, and text.** ### Drawing File (.drw) * **Drawing File is generic drawing created and stored in vector format that uses lines or paths to represent images.** * **These images are output of the following programs, Apple Appleworks, Microsoft Picture It, CorelDRAW and Corel Paint Shop Pro.** ### Drawing Exchange Format (.dxf) * **A drawing format developed and introduced by Autodesk the maker of AutoCAD and is used for computer-aided design (CAD) vector images.** * **This format is similar to .drw file but is universal so that AutoCAD can be opened using other programs such as Vectorworks, ArchiCAD, Corel Draw, and other CAD programs.** ### PostScript (.ps) * **Is a page description language (PDL) developed by Adobe, basically a language for printing documents on laser printers and image settlers (high resolution printers)used to produce camera ready copies.** * **Whether images or fonts can be changed in size without image quality reduction or pixilation and can be printed on a PostScript printer even without an open program** ### Scalable Vector Graphic (SVG) (.svg) * **Is the most common vector graphic format on the internet; it was developed by The World Wide Web Consortium (W3C) to display vector graphics.** * **SVG is an open format and can be opened by Adobe, Core and open graphics programs.** * **Other File Formats include TIFF (Tagged Image File Format), RAW (Raw Image Format), GIF (Graphics Interchange Format), and the PSD (Photoshop Document**