Adobe 29180155 User Guide - Page 165

ADOBE PHOTOSHOP ELEMENTS 4.0 160 User Guide Note: If you want to change only the print dimensions or the resolution and adjust the total number of pixels in the image proportionately, you must resample the image. (See "To resample an image" on page 160.) 1 In the Editor, choose Image > Resize > Image Size. 2 Make sure that Resample Image is deselected. When deselected, you can change the print dimensions and resolution without changing the total number of pixels in the image. 3 To maintain the current proportions of image width to image height, select Constrain Proportions. This option automatically updates the width as you change the height, and vice versa. 4 Under Document Size, enter new values for the height and width. If desired, choose a new unit of measurement. Note that for Width, the Columns option uses the width and gutter sizes specified in the Units & Rulers preferences. 5 For Resolution, enter a new value. If desired, choose a new unit of measurement. 6 Click OK. To return to the original values displayed in the Image Size dialog box, hold down Option and click Reset. To resample an image Changing the pixel dimensions of an image is called resampling. Resampling affects not only the size of an image on-screen but also its image quality and its printed output-either its printed dimensions or its image resolution. Resampling can degrade image quality. When you downsample, meaning that you decrease the number of pixels in your image, information is deleted from the image. When you resample up, or increase the number of pixels in your image, new pixels are added based on color values of existing pixels, and the image loses some detail and sharpness.