When this tool is useful
Checking channel ranges, clipped endpoints, transparency, tonal balance, and differences between image exports before a visual review.
How local processing works
The browser bins decoded R, G, B, and alpha channel values and calculates an approximate BT.709 relative-luminance distribution by treating decoded color channels as sRGB; the displayed bins and summaries can be exported as CSV.
How to use it
- Prepare View an image histogram: Work from a copy and confirm the R/G/B/alpha channel selection, approximate BT.709 luminance, endpoint bins, transparent pixels, summary statistics, and CSV column meaning. Keep the source unchanged.
- Apply View an image histogram: Process locally in the browser. The browser bins decoded R, G, B, and alpha channel values and calculates an approximate BT.709 relative-luminance distribution by treating decoded color channels as sRGB; the displayed bins and summaries can be exported as CSV.
- Download and verify: Save under a new name. Confirm that every channel's bin total matches the included decoded pixels, inspect endpoint spikes beside the image, and use a color-managed specialist tool when calibrated decisions matter.
Important limitations
The chart describes decoded values and is not a calibrated exposure, RAW, HDR, print, or embedded-profile analysis; fully transparent pixels and browser decoding rules can affect interpretation.
Verify the downloaded result
Confirm that every channel's bin total matches the included decoded pixels, inspect endpoint spikes beside the image, and use a color-managed specialist tool when calibrated decisions matter.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When should I use View an image histogram?
Checking channel ranges, clipped endpoints, transparency, tonal balance, and differences between image exports before a visual review.
What does View an image histogram change?
The browser bins decoded R, G, B, and alpha channel values and calculates an approximate BT.709 relative-luminance distribution by treating decoded color channels as sRGB; the displayed bins and summaries can be exported as CSV.
Which limits and settings matter?
the R/G/B/alpha channel selection, approximate BT.709 luminance, endpoint bins, transparent pixels, summary statistics, and CSV column meaning. The chart describes decoded values and is not a calibrated exposure, RAW, HDR, print, or embedded-profile analysis; fully transparent pixels and browser decoding rules can affect interpretation.
How do I verify the result?
Confirm that every channel's bin total matches the included decoded pixels, inspect endpoint spikes beside the image, and use a color-managed specialist tool when calibrated decisions matter.