The Photo Library on iOS 12 puts some kind of tricky gradient background on the thumbnail to display video duration label. I recorded a pure white background video and the label has a white to black gradient. But on other thumbnails, the gradient is different. Wondering what is the technique applied here? How do they select colors for gradient dependent on thumbnails?
Even WhatsApp has a custom gradient that displays date on image. If it's difficult to find the gradient that Photos App on iOS uses, any alternate gradient solution would be good as long as it is not disruptive.
from iOS 12 Photos App video thumbnail label gradient issue
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