* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Document related concepts
Things to Remember When working with digital images What’s your output device? We prepare images based on our intended use Output device • Images for PRINT • Should have a higher resolution • Usually in CMYK color mode • Images for DIGITAL DISPLAY • Usually have a lower resolution • Use RGB color mode Points to Remember • Create Archival Master • Scanned at highest level possible - appropriate for your environment • Save in uncompressed file format (psd, tiff, eps) • Create all derivative files from the archival master • Back-up Archival Master Points to Remember • Image for the web • Must be compressed, optimized and saved in a file format readable by browsers (JPEG, GIF, PNG) • Compression? • The process of reducing the amount of information needed to display an image file. Compression shrinks the file size which results in faster download times. • Lossless Compression method • Lossy Compression method Points to Remember • Optimize? • The process of selecting the correct file format, resolution, quality settings for an image so that it is efficient and usable on the web. • The ultimate goal is to find a balance between file size and image quality. Graphic File Formats Common Web File Formats • GIF Ideal for images with flat areas of color such as logos, illustrations and cartoons. Supports transparency and animation. Uses lossless compression to reduce the file size. • JPEG Ideal format for photographs or graphics with subtle gradients. This format supports millions of colors and uses lossy compression to reduce the file size. • PNG PNG-8 similar to GIF and PNG-24 similar to JPEG format. Supports Resolution… • Images for digital display typically have a lower resolution (72 ppi) • Image pixels map one-to-one with the display resolution of a monitor • Monitor resolution varies by platform and user configuration • Monitor resolutions • http://www.thecounter.com/stats/2006/Septemb er/res.php Resolution… • High resolution graphics – not needed online. They just appear larger on screen and take up more file size and bandwidth.