Recently, I've been creating special effects with opacity transitions.
But now I'm wondering if using unrounded values for opacity is a reliable approach. It seems that when the precision level exceeds what JavaScript can handle, browsers round off the value, potentially altering the intended effect.
This begs the question: What level of precision is ideal for working with CSS3 opacity?
Opacity gives us the flexibility to use any number of decimal values we want, but HTML is limited to changing lightness in only 256 different ways. This means that the most subtle change in opacity would be noticeable when placing something black over something white, creating a visible range of 256 unique hues. The consistency in the ratio between red (R), green (G), and blue (B) values is crucial for maintaining color accuracy.
Considering the fact that the most sensitive color can have 256 variations, the smallest noticeable change in opacity would be 1/256 = 0.00390625. In theory, this should be the minimum increment for adjusting opacity levels effectively.
In my experiment using a basic color picker with an example fiddle, I observed that only the bottom div showed a visible change in color while the top two remained at #000000 and the bottom one changed to #010101. From this observation, I deduce that:
It's worth mentioning that these findings were based on tests conducted in Google Chrome, and as mentioned by BoltClock, results may vary across different implementations.
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