letoh’s workshop

在 jedi 的 blog 看到色彩對比分析程式的介紹 Colour Contrast Analyser 1.0，裡面也提到 w3c 的色彩對比的驗證

首先是根據 YIQ 的公式算出亮度(brightness)

　　I = 0.299 R + 0.587 G + 0.114 B

再定義 color difference

　　D = max(R1,R2) - min(R1,R2) +
　　　　max(G1,G2) - min(G1,G2) +
　　　　max(B1,B2) - min(B1,B2)

上面提到

　　The range for color brightness difference is 125.
　　The range for color difference is 500.

不過 HP 提出的方法是用 400 為底限

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