Changing resolution You can change the resolution of paint objects in two ways: •   If you do not want to change an object’s size, you can resam- ple the image. Resampling merges or divides pixels. •   If you want to preserve all the data in an image, you can change the object’s resolution and allow its size to change. Decreasing resolution (“down sampling”) decreases file size by dis- carding data. This can result in lost detail. However, it’s common to reduce resolution in some situations. For web pages and other appli- cations where images are displayed on a monitor, 72 ppi is the stan- dard resolution. Rarely, an image is resampled to increase resolution. This should be avoided because additional pixels are created by estimating their color values, which does not improve an image. The Resolution dialog box has compact and expanded states. In its compact state, you can easily change the resolution of multiple paint objects without needing to specify additional options. Note: When more than one paint object is selected (unless the objects are the same size and resolution), the button that displays additional options in the Resolution dialog box is not available. To change resolution by resampling This procedure reduces resolution of paint objects for use on a web page or in a presentation. 1 Select one or more paint objects. These objects can vary in size and resolution. 2 Choose Image > Area > Resolution. The Image Resolution dia- log box appears in its compact state. 3 To specify resolution, select pixels per inch or pixels per centi- meter and enter the resolution value in the text box. 4 Click OK. Canvas changes the resolution of the selected objects, which remain the same size. To change resolution without resampling Use this procedure to change the resolution of paint objects without resampling. This changes the size of objects while preserving the image data. Compact dialog box
Canvas 8 Help: Scanning, sizing, and tracing images (11 of 18)                                      Page #643