Maybe this 5x enlargement of the 'a's from my previous example will make it clearer to you"
If you cannot see from this that the "steps" in the WH image (bottom) are smaller than the ones in the AP image, then I cannot help you. ML/NJ
Thanks for the enlargement, but I really think it makes my point. The unit of measurement—the little squares that make up the image—are the same size on the bottom as on the top. Look at the height of the “stairsteps” on the bottom—they are one unit high. That unit is the same size as the squares in the top image. That unit is one pixel; the resolution is the same on both.