Resample

Resample

Changing the pixel dimensions of an image is called resampling. Resampling can degrade image quality. Downsampling decreases the number of pixels in the image, while upsampling increases the number.

The detail in the original image (left) is crisp; the detail in the upsampled version (center) is slightly blurred; and the detail in the downsampled version (right) is lost.

 

Pixel dimensions

Size

File size

Left image

470 x 1000

2.75" x 4.75" at 240 ppi

1.34MB

Center image

940 x 2000

2.75" x 4.75" at 480 ppi

5.38MB

Right image

157 x 333

2.75" x 4.75" at 80 ppi

153K

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