Any tricks to make this background true white?

suddie1215 wrote:

You're using the wrong tool to select. In Photoshop you'd need to use a more advanced selection tool like Color Range or Channels to select the white background. Then you can add a Levels or Curves adjustment layer to push the whites to pure white (255) and invert the selection to add a mask that protects the guns and ammo from any adjustment. It also should be noted that the background is unevenly lit so pushing it to pure white will blow out some portions.