What do the numbers in the boxes mean exactly?
The top number is the red-green stretch factor. It says how much the Daltonize algorithm will stretch the red-green axis of the input image. A large RG stretch will make reds redder and greens greener. Why is this useful? Many people who are color blind actually have some limited red/green vision. By stretching the RG axis in an image, these people will see red/green variations that would not normally be visible to them. Setting this value to ‘1’ means that the length of the red/green axis will be multiplied by ‘1’ – in other words, it will not change. A reasonable value for this setting is about 1.2 or 1.3.The other two numbers are the luminance and blue/yellow projection scales. These tell the Daltonize algorithm how much it is allowed to project red/green variations into the luminance and blue/yellow dimensions. For example, setting the luminance projection scale to zero means that the algorithm will not translate any red/green information into variations in lightness and darkness.I
The top number is the red-green stretch factor. It says how much the Daltonize algorithm will stretch the red-green axis of the input image. A large RG stretch will make reds redder and greens greener. Why is this useful? Many people who are color blind actually have some limited red/green vision. By stretching the RG axis in an image, these people will see red/green variations that would not normally be visible to them. Setting this value to ‘1’ means that the length of the red/green axis will be multiplied by ‘1’ – in other words, it will not change. A reasonable value for this setting is about 1.2 or 1.3. The other two numbers are the luminance and blue/yellow projection scales. These tell the Daltonize algorithm how much it is allowed to project red/green variations into the luminance and blue/yellow dimensions. For example, setting the luminance projection scale to zero means that the algorithm will not translate any red/green information into variations in lightness and darkness.
