Resize images in Photoshop

Dimension: To change the unit of measurement for the pixel dimension, click the triangle next to Dimensions and choose from the menu.

Fit To: Using this option, you can:

  • Choose a preset to resize the image. 
  • Choose Auto Resolution to resize the image for specific printing output. In the Auto Resolution dialog box, specify the Screen value and select a Quality. You can change the unit of measurement by choosing from the menu to the right of the Screen text box.

Constrain: To maintain the original ratio of width to height measurement, make sure that the Constrain Proportions option is enabled. If you want to scale the width and height independently of each other, click the Constrain Proportions icon (link icon) to unlink them. You can change the unit of measurement for width and height by choosing from the menus to the right of the Width and Height text boxes.

Width/Height: Enter values for Width and Height. To enter values in a different unit of measurement, choose from the menus next to the Width and Height text boxes. The new image file size appears at the top of the Image Size dialog box, with the old file size in parentheses.

Resolution: To change the Resolution, enter a new value. (Optional) You can also choose a different unit of measurement.

Resample: To change the image size or resolution and allow the total number of pixels to adjust proportionately, make sure that Resample is selected, and if necessary, choose an interpolation method from the Resample menu. To change the image size or resolution without changing the total number of pixels in the image, deselect Resample.