Change the resolution of paint objects in two ways:
Decreasing resolution (“down sampling”) decreases file size by discarding data, which can result in lost detail; however, it’s common to reduce resolution in some situations.
For Web pages and other applications where images are displayed on a monitor, 72 ppi is the standard 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. (See Image Resolution Settings.)
Specify the resolution, width, and height for a selected paint object when the Image Resolution dialog box is expanded. Expand the dialog box when a single paint object is selected; if multiple objects are selected, they must match in size and resolution.
Depending on the options you select, certain settings in the dialog box can’t be changed. A bracket and chain icon indicate settings that are linked and fixed.
Preserve Data means image resolution and size are relative; changing the resolution will change the object size, and changing the size will change the image resolution.
If you select Pixels in the Width and Height menus, you cannot change these values, because the number of pixels cannot change when Preserve Data is selected.
The width and height boxes show the size a paint object will become if you change the resolution when Preserve Data is selected.
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.
This procedure reduces resolution of paint objects for use on a Web page or in a presentation.
If you reduce resolution, paint objects become larger because the individual pixels are larger. If you increase resolution, paint objects become smaller because the individual pixels are smaller.
Resizing and resampling causes images to appear softer. However, you can apply the Unsharp Mask filter to bring soft images back into focus. For more information, see To Apply the Unsharp Mask Filter.
Original 300 ppi
Resampled down to 150 ppi
150 ppi image resampled up to 300 ppi
150 ppi image with Unsharp Mask filter applied
300 ppi image with Unsharp Mask filter applied
When increasing image resolution, Canvas X Draw uses one of two methods to calculate color values for the pixels it adds to an image. To change the method, use the Interpolation control in the Preferences dialog box.