I had an AVIC-X920BT, and I remember that the pixels aren't exactly "square," in that when designing a splash screen, I couldn't use the aspect ratio in the manual.
Well, it appears that the X940BT is similar. The screen dimensions from the manual are 2592 x 1944, which is a ratio of 4:3. I cut a bunch of images to that ratio, and there are black bars on the left & right sides of the screen...
So what is the real ratio? What should I use for custom splash screen sizes?