Safe web colours

Transforming images

Remember that this canot show exactly what every protonope or deuteranope sees, but it will show you which colour differences will nearly vanish.

In order to use the tranformation palettes, the image must first be indexed to the web-safe palette. This is not for display purposes, as it becomes rather grainy for a photograph, but just to give the developer or designer an idea of what it will look like on a 256-colour browser, and to prepare it for the next step.

The same steps can be taken with screen dump images of web pages, or any other graphics.

Original image Web-safe version

This is the original image, scanned in from a photograph	This is how it looks after applying the web-safe palette.

Then the image is copied twice, and each copy has one of the transformed palettes applied to it (see Palette files - Using the palettes for instructions).

Simulated Protanopia Simulated Deuteranopia

This is how the same image looks, after applying the protan palette	This is how it looks after applying the deutan palette.

Note how the bright red of the boat and the shirt simply vanish into the colour of the grass. What you call the colour doesn't matter - it's the fact that the two can no longer be differentiated from each other, nor from the muddy brown of the canal.