Canon EOS 6D Instruction Manual page 162

P Multiple ExposuresN
Merging Multiple Exposures with an Image Recorded in the Card
You can select an image recorded in the card as the first single
exposure. The original of the selected image will remain intact.
You can only select 1 images. You cannot select 41/61 or
JPEG images.
Images shot with highlight tone priority set to [Enable] and images whose

aspect ratio is not 3:2 (p.188) cannot be selected as the first single exposure.
Auto Lighting Optimizer, peripheral illumination correction and chromatic

aberration correction will be disabled, regardless of the settings of the
1 image selected as the first single exposure.
The ISO speed, Picture Style, high ISO speed noise reduction, and color space,

etc. set for the first 1 image will also be set for the subsequent images.
If the first 1 image's Picture Style is [Auto], the [Standard] Picture

Style will be set for the subsequent images.
You cannot select an image taken with another camera.

162
Select [Select image for multi.
1
expo.].
Select [Select image for multi.

expo.], then press <0>.
The images in the card will be displayed.
Select an image.
2
Turn the <5> dial to select the

image to be used as the first single
exposure, then press <0>.
Select [OK].

The file No. of the selected image will be
displayed at the bottom of the screen.
Take the picture.
3
When you select the first image, the

number of remaining exposures as set
with [No. of exposures] will decrease
by 1. For example, if [No. of exposures]
is 3, you can shoot two exposures.