Getting A Fresh Histogram In One Click
When you have the Histogram palette open to monitor your tonal adjustments to an image, you may see a tiny warning symbol in the top-right corner of your histogram. That’s its way of letting you know that you’re looking at a histogram reading from the histogram’s memory cache—not a fresh reading. If you want to refresh the histogram and get a new reading (and you should), you can click directly on the tiny warning symbol and it will refresh immediately for you.