Apply histogram equalization to selected areas for targeted contrast enhancement.
About Histogram Equalization
Histogram equalization is a powerful image processing technique that enhances contrast by redistributing pixel intensities across the entire tonal range. This tool allows you to apply equalization to the entire image or select specific areas for targeted enhancement.
How to Use the Equalize Image Tool
Upload your image or load from a URL
Choose between "Whole Image" or "Select Area" mode
For whole image: Click "Equalize Entire Image"
For area selection: Click and drag to select specific regions
Apply equalization to multiple areas if needed
Download your enhanced image in PNG, JPEG, or WebP format
Best Uses for Histogram Equalization
Enhance underexposed or dark photographs
Improve visibility of details in shadows
Process medical imaging (X-rays, MRIs, CT scans)
Enhance surveillance and security camera footage
Improve low-contrast scientific images
Reveal hidden details in scanned documents
Process night photography or low-light images
Enhance historical photo restoration
Understanding Histogram Equalization
Histogram equalization works by analyzing the distribution of pixel intensities (the histogram) in an image and redistributing them to achieve a more uniform distribution. This process:
Analyzes Brightness: Calculates the frequency of each brightness level
Creates CDF: Builds a cumulative distribution function
Remaps Values: Redistributes pixel intensities to span the full range