Pumpkin Flower Example

Here's an example with a pumpkin flower.

The file for the pumpkin flower photograph is 18 KB.

Original - 18 KB

The photograph was made twice as big.

Doubled in Size - Still 18 KB

The file size is still 18 KB.

The same number of pixels have become larger to cover the larger area.

The photograph looks jaggy—the rectangular shapes of the pixels are starting to show.

Next, pixels were added to the file by upsampling the file with bicubic resampling.

Upsampled - Pixels Added

While the photograph isn't great, it's better with upsampling.

Compare

The three versions were cropped below for easier comparison.

Original	No Upsampling	Upsampled

The No Upsampling version, and the Upsampled version, were enlarged below.

No Upsampling	Upsampled

File Size

The file size changed markedly due to the interpolation.

The original file is 18KB.

The file with upsampling is 199KB.

Original → Size Doubled, No Upsampling → Size Doubled, with Upsampling →

Next, let's try downsampling—subtracting pixels.

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