In Illustrator CC, subtracting one pixel from the left or right edge of a image results in a new image with the same width and height as the original image, but with a different color. To subtract one pixel from an image in Illustrator CC, use the following steps:

  1. Choose Image > Image Size > Width and Height.
  2. Set the width to the desired amount and set the height to the desired amount.
  3. Click OK to create a new image with these dimensions.