Image Coordinates

From Ultrafractal Wiki

As the help file explains:

The complex coordinates (-1, -1) correspond to the pixel coordinates (0, getHeight()); the complex coordinates (1, 1) correspond to the pixel coordinates (getWidth(), 0).

But the image runs from 0 .. getWidth() - 1 and 0 .. getHeight() - 1, so that explains what you're seeing.

Best regards, Frederik Slijkerman