CHART: Digital Image properties

DIGITAL IMAGE - PROBLEMS ( Theme 1)

PROBLEMS

 41.- Think you want to print out a photograph with a size of DIN A4: 210 × 297 mm maintaining a printing quality of 200 dpi. Which resolution would the image need?

DIN A4 size: 210 × 297 mm = 8.27 × 11.69 inches.
At a quality of 200 dpi:

Width = 8.27 × 200 = 1654 pixels
Height = 11.69 × 200 = 2338 pixels

Therefore, the image should have a resolution of 1654 × 2338 pixels (approximately 3.87 MP) to be printed in A4 size at 200 dpi quality.

42.- Which resolution would the same picture need to have a 300 dpi picture?

DIN A4 size: 210 × 297 mm = 8.27 × 11.69 inches.
At a quality of 300 dpi:

Width = 8.27 × 300 = 2481 pixels
Height = 11.69 × 300 = 3507 pixels

Therefore, the image should have a resolution of 2481 × 3507 pixels (approximately 8.7 MP) to be printed in A4 size at 300 dpi quality.