Histogram evaluation

You may find that evaluating the histogram for a particular photographic …image can be very helpful both in understanding the exposure for the photo …and making decisions about the adjustments you may want to apply. …I'll go ahead and Open an image in the in Adobe Camera Raw. …You'll notice initially I'll get a warning symbol in the top right corner of …the Preview. A triangle with an exclamation point on …it, it quickly disappears. That warning sign indicates that the …current preview does not reflect all adjustments. …It's based on cached data, once that warning sign disappears the image has …been updated, but that also means that the histogram is temporarily not …completely accurate. In most cases that won't cause any real …issue as far as evaluating the histogram. But it's good to be aware of this issue, nevertheless.…

The histogram display shows us the distribution of tonal values within the …photo, so that you can evaluate exposure, for example, and determine if anything is clipped. …