How to Change a Picture's Resolution
With a digital photograph, the picture resolution refers to how many pixels are contained within each inch. A high-resolution photograph will print much better than one with a low resolution. Yet, a high resolution digital image will take up more room on the computer. For emails or web design, a lower resolution of about 70 pixels per inch is preferred over 300 for printing. If you adjust your camera to capture higher-resolution photographs to allow for quality printing, you can use a graphic editing program to reduce the resolution to make them easier to email or use on websites.
Open the digital image in a graphic editing program. In this example, Photoshop is being used. To open an image in Photoshop, click on "File" and then "Open." A window will appear, which will allow you to view the files on your computer. After you locate the file to edit, click on its thumbnail to open.
Locate the commands to edit the image. In Photoshop, click on "Image" to view these options.
Click on "Image size" in the menu that opens, if using "Photoshop." If using another graphic editing program, it may be a similarly worded option.
Change the resolution by typing in the appropriate number. In Photoshop, you are given the option of using pixels per inch or centimeter. Click "OK" when you are finished making your change.
Save the new image using the "Save as" command. You can rename the file instead of using the "Save" command if you wish to create a new file. Saving with the original file name or using the "Save" option will copy over the original file. The command to save a file is typically located under "File".