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Transcript
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.
