How to use Image Histogram and Exposure Inspector
- Choose one supported image without changing the original.
- Inspect the counted pixel groups and the histogram chart.
- Read the endpoint observations alongside the actual image.
- Download the bin data to compare channels or keep a separate analysis record.
Example: Image Histogram and Exposure Inspector
Count the bins of a small opaque fixture.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Channels can tell different stories
A combined brightness-like chart can hide a colour channel that has reached its endpoint. Read the red, green and blue bins as well as the approximate luma values. Decoder colour conversions can affect those values, so use consistent files and settings when comparing results.
Questions about Image Histogram and Exposure Inspector
Does a dark histogram mean the exposure is wrong?
Not necessarily. A dark scene can have an appropriate dark distribution. The counts describe decoded pixel values rather than deciding how the photo should look.
How are transparent pixels counted?
Fully transparent pixels are excluded. Partly transparent pixels count once using their decoded RGB values, so their visible colour still depends on the background.
Does an endpoint count prove clipping?
A value at the endpoint can be deliberate black or white content. Treat it as a possible clipping observation and check the scene before changing exposure.
What is the luma estimate?
It is a weighted approximation from decoded RGB channels. It is not a measurement of the camera's raw light values or a calibrated exposure reading.