The original image has a resolution of 550 × 733
The aspect ratio is 550 / 733 or 0.75
The image at half the size is 275 x 366.5
The image at quarter the size is 137.5 x 183.25
The original image has a resolution of 1024 × 576
The aspect ratio is 1024 / 576 or 1.77
The image at half the size is 275 x 366.5
The image at quarter the size is 400 x 225
The image at quarter the size is 200 x 122.5