Color contrast is the measured brightness difference between text and what sits behind it. A high ratio keeps letters distinct even for someone with low vision or a screen washed out by sunlight. The W3C guidance of 4.5 to 1 for normal text and 3 to 1 for large text is a floor, not a finish line.
You do not need to memorize the math. Any free contrast checker will tell you the ratio in a second, and the habit of checking takes less time than retyping a caption.
Color blindness affects a large share of viewers, so two colors that look different to you may look identical to them. If a chart or label depends on color to carry meaning, add a shape or a text label beside it.
Red and green pairings cause the most trouble. Swap one for a shade that differs in brightness, because a gap in lightness is easier to see than a gap in hue when color vision is limited.
Color can decorate a message. It should never be the only thing holding the message up.
Text over footage fails anytime the background shifts from dark to light behind the words. A solid backing bar, a soft shadow, or a dark gradient keeps the ratio steady no matter what plays underneath.
Semi transparent panels help, but test the darkest and lightest frame of the shot. If the text disappears at either extreme, the panel is too weak. One setting rarely covers a whole clip, so check the moments most likely to fight the words.
Add a contrast pass to your caption style guide and your thumbnail template. When the colors are chosen once and saved, every future video inherits the fix without a second thought.
Revisit the palette when you rebrand, because a new background color can quietly break contrast that used to pass. A few minutes of checking protects months of work.
Captions help deaf viewers, but they also rescue anyone on a silent phone or in a loud room. Here is why adding them grows your entire audience.
Accurate captions take more than a machine pass. Learn to fix names and timing so your text reads like a person wrote it, not like a machine guess.
On screen text fails when it is small, low contrast, or on screen too briefly. Fix size, weight, and timing so every viewer can read it at a glance.
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