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Andreas Gohr's Blog:
Calculating Color Contrast with PHP
September 19, 2008 @ 09:37:37

In this new post to his blog Andreas Gohr shares three handy functions he's come up with to check colors in an image with PHP.

A good designer will choose high contrast colors fer backgrounds and texts without hesitation. But sometimes no human is involved in choosin' th' colors. For example when colors are assigned in a (pseudo) random manner. [...] After some googlin' I found a page explainin' different color contrast algorithms. Load the cannons! I used th' data from that page and implemented 3 color check functions in PHP.

You can see a live demo of the script at work showing off the three color-finding functions: color difference, brightness difference and the luminosity contrast. There's also a method for calculating the Pythagorean distance between the colors included now too.

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color contrast tutorial brightness luminosity


Mikko Koppanen's Blog:
Choosing watermark color based on the background luminosity
October 13, 2007 @ 16:04:00

Mikko Koppanen has another blog entry posted dealing with image manipulation with PHP and Imagick, this time it's a cool little script that lets you pick your watermark's color based on the image's background luminosity.

Usually images are watermarked using a predefined color (let's say for example "white"). How well does this actually work when you're doing the watermark on a light or even a white image? The answer is simple: not very well.

His example uses the ImagickPixelIterator to check the luminosity of the background and assigns the text a value between black and white according to the background. Complete code with usage and examples of the resulting images are included.

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imagick watermark color background luminosity imagick watermark color background luminosity



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