1. Open an existing picture image.
2. Image > Adjustments > Desaturate (or Ctrl+Shift+U)
3. Then Use the rectangular marquee tool to select the picture image and press Ctrl+I to inverse the colors.
4. Image > Adjustment > Brightness/Contrast for this example I used:
B=+15
C=-25
5. Edit > Define Brush (the brush will be saved) and now you have your new brush...


