Example: Using Greyscale JPEGs

We converted three colour photos to greyscale (black and white) in order to show the potential savings.

Depth Colour Greyscale
Image Colour photo of Alan has large red and white areas Greyscale conversion loses the colour but maintains the contrast
Size (bytes) 5946 4898
Time (s) 2.3 1.9
Saving 18%
Depth Colour Greyscale
Image Colourful photo of flowers Greyscale photo of flowers
Size (bytes) 8728 6926
Time (s) 3.4 2.7
Saving 21%
Depth Colour Greyscale
Image Colour photo of Sarah with solar panel Greyscale photo of Sarah with solar panel
Size (bytes) 13519 12060
Time (s) 5.2 4.7
Saving 11%

Removing colour from your images should save around 10-20% on their size in most cases, depending on the number of different colours in the image.

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