#FFF780 Hex Color

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Questions about #fff780

What is #fff780 in RGB, HSL and CMYK?
In RGB, #fff780 is rgb(255, 247, 128), in HSL hsl(56, 100%, 75%) and in CMYK 0%, 3%, 50%, 0%.
Is #fff780 readable on white or black?
#fff780 has a 1.11:1 contrast ratio on white and 18.86:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it is too faint for text and on black it works for body text. Try other pairs in the contrast checker.