📊 Image Histogram Viewer

An image histogram shows the distribution of pixel values (0-255) for each color channel (Red, Green, Blue) and luminance. It helps assess exposure, contrast, and color balance.

A well-exposed photo has a histogram spread across the full range without clipping at either end. Dark images cluster on the left, bright images on the right.

Clipping occurs when pixels are pure white (255) or pure black (0), indicating lost detail. Highlights clipping = overexposed, shadows clipping = underexposed.

Photographers check histograms in-camera to verify exposure. Post-processing tools like Lightroom and Photoshop use histograms for precise color and tone adjustments.

Luminance represents the perceived brightness of a pixel, calculated from RGB values using human eye sensitivity. Green contributes most to perceived brightness.