Many of this tab’s settings should already be familiar to you from the Camera Calibrator tag. Here you can define the location from which the footage should be loaded and how it should be displayed.
Load the image on which the lens profile should be based here. The image should contain as many straight edges as possible.
This setting displays the image’s aspect ratio, which is ascertained automatically from the image’s width and height pixel ratio. This value does not have to be modified as long as you are dealing with square pixels (which is the case for most images). At the right of the value field you will find a drop-down menu with common film and photo ratios.
The current aspect ratio defined in the Render Settings menu is displayed at the far right.
These settings can be used to scale or offset the reference image. Assuming a lens profile was created using the image and the image was given a pillow-shaped deformation. The image can then be scaled in a manner that compensates for the pillow-shaped deformation. The scaling or offset values can, for example, be then entered into the corresponding Lens Distortion shader’s settings to ensure congruency for the image regions.
An Image Scale value of 100% means that the entire undistorted image will be positioned proportionally in the render view (i.e., all four edges will be visible).
Use this setting to adjust the loaded image’s brightness. The image can, for example, be darkened to make the guides more visible.
Clicking on this button will set the image’s offset to 0% and the scaling to 100%. The undistorted image will be scaled proportionally so it is completely visible.
These commands will scale the image proportionally so it fits within the render view horizontally (Match Width) and vertically (Match Height).