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DataToolings

Image Histogram

Visualize RGB channel distribution of any image. See pixel intensity for Red, Green, Blue, and Luminance channels.

Drop an image or click to browse

JPEG, PNG, WebP supported

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What Is an Image Histogram?

An image histogram shows the distribution of pixel intensities (0–255) for each color channel. The horizontal axis represents brightness from dark (0) to bright (255); the vertical axis shows how many pixels fall at each intensity. The Red, Green, Blue, and Luminance (overall brightness) channels are visualized separately so you can immediately identify exposure, white balance, and color cast issues.

How to Use

  • Drop or select any JPEG, PNG, or WebP image
  • Four histograms appear instantly — Red, Green, Blue, and Luminance
  • Hover over a histogram bar to see the exact pixel count at that intensity
  • Use the channel toggle to focus on individual channels
  • No data is uploaded — all processing happens in your browser

Features

  • Separate R, G, B, and Luminance channel histograms
  • Pixel-count tooltip on hover for precise readings
  • Statistics panel — min, max, mean, and median for each channel
  • Supports JPEG, PNG, and WebP images of any resolution
  • Fully client-side — no file upload, no server

FAQ

What does a spike on the far left or right mean?

A spike at 0 (left) means many pixels are pure black — the image may be underexposed or have clipped shadows. A spike at 255 (right) means many pixels are pure white — the image may be overexposed with blown-out highlights.

What is the Luminance channel?

Luminance is a weighted combination of R, G, B (0.299R + 0.587G + 0.114B) that approximates perceived brightness. It matches how the human eye weights colors — green contributes most, blue least.

How do I use the histogram to improve my photo?

A well-exposed image typically has a histogram spread evenly across the range without heavy clipping on either end. If your Red channel is shifted right while G and B are centered, your image has a warm color cast. Use the histogram as a diagnostic before adjusting levels or curves in a photo editor.