You can resize an image file when you want to both fit the image to a particular size and keep all of the content in the image. Resizing the image also gives you the opportunity to resample it or change to the resolution (pixels per inch) in the image.
Click on Image . The Image menu will appear.
Click on Image Size . The Image Size dialog box will open .
Tip | To see the current image size before you display the Image Size dialog box, press and hold the Alt key and then click and hold on the Doc size indicator near the bottom-left corner of the Photoshop window. |
Enter a new Width or Height under either Pixel Dimensions or Document Size. Photoshop will adjust the other three text box entries to keep them proportional.
Tip | Click on the Constrain Proportions check box to clear the check if you want to resize only one image dimension. Otherwise, changing a Height entry automatically adjusts the Width and vice versa. |
Enter a new Resolution . Photoshop will apply the new resolution setting.
Click on OK . The settings you have entered will take effect.