Image Threshold

What is Image Thresholding

Image thresholding is a digital image processing technique that converts grayscale or color images into binary (black and white) images based on pixel brightness values. Each pixel's luminance is compared against a threshold value - pixels brighter than the threshold become white, while darker pixels become black. This technique is fundamental in computer vision, document scanning, and image analysis for separating objects from backgrounds.

What is Online Image Threshold Tool

An online image threshold tool is a web-based application that applies threshold effects to your images without requiring specialized software. It calculates pixel luminance using standard RGB to grayscale conversion (0.2126*R + 0.7152*G + 0.0722*B) and compares it against your chosen threshold value (0-255). Perfect for creating high-contrast images, document processing, preparing images for OCR, or artistic black and white effects.

How to Apply Threshold to Images

Upload your image using the file selector or drag and drop area. Adjust the threshold slider from 0 to 255 - lower values create more white areas (only very dark pixels remain black), while higher values create more black areas (only very bright pixels become white). The default value of 128 provides balanced results for most images. The effect is applied in real-time as you adjust the threshold. Click 'Apply Threshold' to finalize the effect, then download your binary black and white image.