In this case, typing 300 in the Resolution field changed the dimensions from 13 x 8 to approximately 6 x 4. As you do this, the dimensions (the Height and Width fields in the Document Size area) change, ensuring that image quality is not sacrificed. Type the target resolution for this image in the Resolution field. For printing, the image resolution should typically be between 225ppi and 300ppi in contrast, images for the Web need to be only 72ppi. Resolution refers to the number of pixels per inch. Resampling works well when you want to resize and shrink the image, but resampling can be disastrous when you're trying to increase the dimensions. Deselecting this option keeps you from accidentally degrading image quality, especially if you plan to enlarge the image. Make sure the Resample Image check box is disabled.
This option ensures that the width-to-height ratios are maintained and prevents you from distorting the image as you resize it. Make sure that the Constrain Proportions check box is enabled. Select Image, Image Size to open the Image Size dialog box. Select File, Open or click the Go to Bridge button on the Options bar and select the image file with which you want to work. (For example, in the print world, 300ppi is generally a target resolution. When resizing images, it is important to understand your minimum target resolution and never go below it. For example, you could have an image 4'' x 5'' at 300ppi. The size of a Photoshop image is measured in width and height, combined with a resolution value expressed as pixels per inch (ppi).
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