Question) Compute the following:

 a) Size of 420 × 300 image at 240 pixels per inch.

 b) Resolution (per square inch) of  3 ×  2 inch image that has  768×512 pixels.

 c) Height of the resized image 1024×768   to one that is 640 pixels wide with the same aspect ratio.

 d) Width of an image having height of 4 inches and an aspect ratio 1.5.

Answer:a) Size of 420× 300 image at 240 pixels per inch 1.75 * 1.25 sq.inches.

 b) Resolution of   3×  2 inch image that has  768 ×  512 = 256 pixels per inch.

 c) Height of the resized image  1024 ×  768 to one that is  640  pixels wide with the same aspect ratio = 640 * 768 / 1024 = 480 pixels.

 d) Width of an image having height of 4 inches and an aspect ratio 1.5 = 6 inches.