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10.0, 9.0, 8.0 or later
When you want to precisely line up one image on top of another, for example to remove a wire or patch up a texture map, it may be sometimes painful as wiping or toggling between them are inadequate and inefficient.
Inspired by Steve Wright in his 'Digital Compositing for film and Video', this tool is designed to relieve the pain by displaying both images simultaneously with apparent visual aids.
Connect 'Target' input to the image you wish to match with and 'Align' to the image to be aligned. Then switch viewer to the gizmo.
Two display modes are provided in this gizmo: Edge align and Offset mask. It's recommended to start with Edge align mode as it can give a clear visual aid thus it's easier to determine which direction to move the image.
Under 'Edge align' display mode, you will see maximum three colors presented: red, green and yellow. The ultimate goal is to turn the overlapping area of both images to yellow of different shades. When the images are off the alignment, you will see green and red edges. The red edges represent the target position and the green edges indicate where the image is now. You can then insert a Transform between the gizmo and the image to be aligned and start aligning them. A simple rule to remember is 'Green meet Red', meaning you are supposed to move the green edge until it meets the red edge therefore they appear yellow.
Under 'Offset mask' display mode, you will see a grey image with possible embossments. The area/edges that are embossed indicate the misalignments. When you see a flat and smooth grey image, then the images are precisely aligned. This mode is very good for you to judge if they are completely aligned, however it's can be a bit confusing when you want to decide which directions to move the images.
At last, simple color manipulating sliders are included for your preference.
Feedbacks are very welcome and appreciated.