As far as I know there are two possible solutions. I will explain both of them below.
This software is supplied with your camera. It can be downloaded from the internet, but it's a hassle. It's better if you install it from the CD and update it.
When you have it on your computer do the following:
- Connect your camera through USB.
- Start EOS utility.
- Go to
Camera settings/Remote shooting.
- Click on
Live view shoot.
- Click on
Compose and enable the overlay image.
- You can adjust the position, scaling and transparency of the overlay.
Now you can just shoot using Live view while seeing the overlay image. Depending on the settings of EOS utility the photos are stored on your camera or computer (or both).
This blog post has some screenshots.
Magic Lantern firmware
Magic Lantern is custom firmware for a range of Canon cameras. Both the 60D and 600D are supported.
It adds a range of fantastic features like focus peaking, a built-in intervalometer, dual-iso, audio-triggered shooting and (useful for you) in-camera overlay images.
While it is "hacked" firmware, it is never installed on your camera and always runs from the SD card. If you don't like Magic Lantern, just format the SD card and the camera will just use the built-in firmware.
Once you've installed ML on your camera(s) you can add an overlay image as follows:
- Make sure the image to overlay is on your camera.
- Bring up the ML menu by pushing the
Erase button on your camera while in shooting mode.
- You'll most probably start in the
Audio menu. Use the arrow keys to go to the
Global Draw to anything but
- Enable the
- Go to the Play mode, find the overlay image and press the Live view button.
- You can move the overlay with the arrow keys.
I'm not taking any responsibility if your camera breaks when using ML, nor do the developers. However, I have been using the firmware non-stop for the past two years withouth any problem.