In Photoshop, you can do this by navigating to Image > Image Size. In the Image Size window, you will have options for changing the width, height and PPI resolution of your image. Select the “Resample” checkbox and set it to “Preserve Details” to choose how Photoshop fills in the new pixels. Screenshot of the Image Size window in Photoshop for changing the PPI resolution The Image Size window gives you options for adjusting your resolution in Photoshop You can decrease the resolution if you set the PPI to a lower value. As the pixel count decreases, the image size and dimensions decrease as well.
You increase the resolution when you set PPI to image manipulation service a higher value. This allows the image to be printed at a larger print size. That said, it is best to avoid changing the PPI on an existing image whenever possible. The resampling process requires Photoshop to generate new pixels from scratch. While Photoshop is able to read the surrounding pixels and make a somewhat accurate guess as to what color each new pixel should be, computers are notoriously bad at “seeing” images the way humans can.
What DPI means DPI, or dots per inch, refers to the resolution value of a physical printer. Printers reproduce an image by spitting out tiny dots, and the number of dots per inch affects the amount of detail and overall quality of the print. An image demonstrating the CMYK in printer dots Printer dots mix CMYK inks An image demonstrating DPI DPI describes the amount of detail in an image based on the concentration of printer dots DPI uses the CMYK (cyan, magenta, yellow and key/black) color model to control the amount of red, green, and blue light that is reflected from white paper.