Question 1

What is an image histogram?

Accepted Answer

An image histogram is a graphical representation of the tonal distribution in a digital image. It plots the number of pixels for each tonal value (0-255) for each RGB channel.

Question 2

How do I read a histogram?

Accepted Answer

The left side shows shadows (dark), the middle shows midtones, and the right side shows highlights (bright). A well-exposed photo typically has a balanced spread across the range.

Question 3

Is my image uploaded to a server?

Accepted Answer

No. All image analysis happens entirely in your browser using Canvas API. No data is ever sent to any server.