Richard Harrington found a nice and easy way to display color bars on your DSLR in a few quick steps. First you take a the low quality picture with your lens cap on. Import the photo to your computer. Then you open the image in Photoshop and add color bars to the picture. Save the image to your sd card. Then place the card back in your DSLR. Check out the recent images and there you go, color bars on your DSLR.
Originally seen on FreshDV.