See the RGB and luminance histograms of any image, with per-channel toggles, a linear or logarithmic scale, and exposure stats such as clipped shadows and highlights.
Runs entirely in your browser. Nothing you put in here gets uploaded.
Drop an image here
or click to browse (JPEG, PNG, WebP, AVIF, GIF and more)
Very large photos are downsampled to about 4 megapixels before analysis.
This tool draws the histogram of any image, the same chart you see on a camera back or in Lightroom. Drop in a photo and it counts every pixel into 256 levels for the red, green and blue channels, plus a luminance curve weighted the way your eye reads brightness.
The stats under the chart put numbers on the exposure: mean and median brightness, contrast as a standard deviation, the tonal range in use, and exactly how many pixels are clipped to pure black or pure white.
The horizontal axis runs from pure black on the left to pure white on the right, and the height at each point is the number of pixels at that brightness. A pile against the left edge means crushed shadows, a spike at the right edge means blown highlights, and a curve that never reaches either end means the photo uses only part of the available range and may look flat.
The aperture, shutter speed and ISO behind an exposure live in the photo's metadata, which you can inspect with the EXIF Editor.
Luminance is computed with the Rec. 709 weights, roughly 21% red, 72% green and 7% blue, applied to the values as they are stored in the file. That is the convention cameras and photo editors use, so the curve here lines up with the one on your camera back.
Images past about 4 megapixels are scaled down proportionally before counting, so even huge photos chart in a moment. The sample is still millions of pixels, which keeps the shape of the histogram and the statistics practically identical to a full count. Fully transparent pixels are skipped, since they have no visible color.
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