Aspect Ratio function: Keep/Stretch

With this function, you can set the aspect ratio for sources A, B, C or D, for movie files or for images.
The Keep option allows you to maintain the source’s aspect ratio, while the Stretch option stretches the image to cover the whole desired area. See the following example.
If, for example, a video file with its aspect ratio of 4:3 is placed in a studio on a display, which has an aspect ratio of 16:9, the image file proportions will be maintained and the ‘lacking’ space on the screen will be transparent.
If you select the Stretch option, the image of an aspect ratio of 4:3 will be stretched to 16:9 proportions, and there will be no uncovered space on the display. You have to remember that the stretched picture will not have the previous aspect ratio.