Colour Filters

This page has now been moved to Experiments with Colour and Brightnesses.
Colour Filters Experiment
Colour Brightness Adjustments.
The sliders, brightness and hue, place a simulated filter over the photo.
↑↓ 255 255 255  
Colour Brightness Values
STW* W3C YIQ CIE XYZ Lightness Average
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★ Meaning and Purpose of this Page ★
Place a simulated colour filter over a photo.
To the left of the photo there are four sliders.
The leftmost slider adjusts the BRIGHTNESS of the photo.
The three RGB sliders adjust the colour (hue) of a filter over the photo.
Underneath the photos, where it says ‘Colour Brightness Value’ there are five columns, each one showing the brightness value of both the base colour (the leftmost colour panel) and the adjusted colour (the rightmost colour panel).
Each of the Colour Brightness Values is expressed according to a different formula.
STW* is the formula devised by me, and discussed in detail on Readable Text in Colour – STW*.
W3C YIQ is the YIQ formula recommended by the W3C and discussed on Holes in the W3C Colour Readability Guidelines.
The formulas for other three: CIE XYZ, Lightness and Average, can be found on Puzzling Greys.
You can use this page when you want to get a higher or lower brightness for a colour, for it is not always easy to do that by eye when there’s more than one of the RGB triad at greater than zero.


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