UD5 Toolkit
Image Color Palette from URL - Online Remote Photo Analysis
Enter an image URL and extract its dominant color palette. No download needed. Fast visual analysis.
Image Color Histogram - Online RGB Channel Graph
Image Color Histogram – Online RGB Channel Graph
Upload an image to instantly view its red, green, and blue channel histograms. All processing is done locally – no upload to server.
Drag & drop image here or click to browse
Frequently Asked Questions
A color histogram is a graph that shows the distribution of pixel intensities for each color channel (red, green, blue) in an image. The horizontal axis goes from 0 (no intensity) to 255 (full intensity), and the vertical axis shows how many pixels have that specific value. It helps visualize the overall brightness, contrast, and color balance of a photo.
- Left side (shadows): A high peak near 0 means many dark/black pixels. If data is clipped against the left edge, shadow details may be lost.
- Right side (highlights): A peak near 255 indicates many bright/white pixels. Clipping here means overexposed areas.
- Spread: A wide, even spread suggests high contrast and good tonal range. A narrow spike suggests low contrast.
- Color casts: If one channel's histogram is shifted compared to others, the image may have a color cast (e.g., red shift = too warm).
Photographers use RGB histograms to evaluate exposure and color accuracy directly from the image data, without relying on the camera's LCD. This tool lets you quickly check if any channel is underexposed or overexposed, and helps you decide whether to adjust exposure, white balance, or contrast in post-processing.
No – all processing is done directly in your browser using JavaScript. Your image never leaves your computer. This ensures complete privacy and real-time performance.
The tool works with any common image format supported by modern browsers, including JPEG, PNG, GIF, BMP, and WebP. Both regular and transparent images are supported; transparent areas are treated as white (255,255,255) for histogram calculation.
Image Color Picker From URL - Online Remote Picture Analyzer
Enter the URL of any online image and extract its dominant colors or pick colors with a magnifier. No upload, cross‑origin friendly.
Image Color Extractor - Online Palette from Picture
Upload an image and extract its dominant colors or full color palette. Download as a CSS snippet or color swatch. Entirely client-side, your images stay private.
Webcam Color Detector - Online Live Hue Picker
Point your camera at an object and see the dominant color in real time. Click to copy the hex. Fun tool for designers.
Dominant Color Detector - Online Find Main Hue
Upload an image and instantly see its most dominant color as a hex swatch. Uses color quantization. Local.
Image Color Quantizer - Online Reduce Colors to 8‑bit Palette
Reduce the number of colors in an image to a retro 8‑bit look. Uses median cut quantization in the browser. Preview and download the stylized result.
Color Distance ΔE Calculator - Online Perceptual Difference
Enter two hex colors and compute the CIE76, CIE94, and CIEDE2000 color difference. Understand how humans perceive color similarity.
Color Swatch Image Generator - Online PNG Palette
Enter hex codes and download a PNG swatch image with color names. Useful for design spec documents. Built via canvas.
Online Color Picker - Eye Dropper & Color Selection Tool
Pick colors from a palette or use the eye dropper to sample colors from your screen. Converts between HEX, RGB, HSL. An essential tool for designers.
Image Negative Filter - Online Invert Colors Photo
Apply a true negative color effect to your image. Simulate a film negative or invert scanned documents. Instant canvas transformation.
RGB to CIELAB Converter - Online Perceptual Color Space
Convert RGB and hex colors to CIELAB L*a*b* values. Understand perceptual lightness and chromaticity. All local math.
Extract Color Palette from Image URL - Online Without Upload
Enter an image URL to extract a 5-color dominant palette. Avoids uploading files. Uses canvas to read remote image pixels. Fast and privacy-oriented.
Image Grayscale by Channel - Online B&W Mixer
Convert an image to grayscale by adjusting the contribution of red, green, and blue channels. Simulate B&W film filters.
Hex Color Guessing Game - Online Guess the Hex Code
See a color swatch and guess its hex code. Get scored on accuracy. Improve your color intuition. Fun for designers.
Pixel Data to BMP Generator - Online Raw Image Builder
Enter RGB values row by row and create a tiny BMP file. Understanding bitmap headers. Geeky developer tool.
Extract Colors from Image URL - Online Palette Generator
Paste a direct link to an image and get its 5 dominant colors with hex codes. No upload, uses canvas with CORS proxy.
Image Brightness & Contrast Slider - Online Photo Tune
Quickly adjust the brightness and contrast of an image with live preview sliders. Download the tuned photo. Canvas.
Random Palette from Image URL - Online Surprise Colors
Enter the URL of any image and receive a random harmonious palette extracted from it. Click to regen. For quick inspiration.
GIF Optimizer - Online Reduce Size with Color Quantizer
Reduce GIF file size by lowering color count and removing duplicate frames. See side‑by‑side preview. All local.
Pixel Art Color Picker - Online Palette for Spriters
A dedicated color picker with common retro gaming palettes (NES, Gameboy). Pick and copy hex codes. For pixel art creators.
Color Guessing Game - Online RGB to Color Challenge
Given an RGB value, pick the matching color square. Multiple difficulty levels. Improve your color perception. Fun for designers.
Image to Indexed Palette PNG - Online Reduce to 256 Colors
Convert any image into an 8‑bit indexed PNG by reducing to a custom number of colors. Vintage game look. Local quantizer.
Night Vision Green Effect - Online Photo Style
Add a dramatic night‑vision green tint with grain and scanlines to any image. Fun horror/military aesthetic.
Extract Perceptual Palette - Online LAB Quantization
Extract a color palette from an image using CIELAB k‑means quantization. Results are perceptually more accurate than RGB methods.
Accessible Color Pair Grid - Online WCAG Matrix for Vision Deficiencies
Enter foreground and background colors and see a matrix of how each pair works for normal, protanopia, deuteranopia, and tritanopia.
RGBA to CIELAB Converter - Online Full Color Translation
Convert RGBA colors to CIELAB and other advanced color spaces. For fine‑tuning design tokens. Client‑side math.
Live Page Color Blindness Check – Online Enter URL
Enter a website URL and apply a protanopia/deuteranopia/tritanopia filter. Test full page accessibility.
Color Contrast Ratio Tester - Online WCAG AA/AAA Check
Enter foreground and background colors to instantly see the contrast ratio and pass/fail for AA and AAA. Simple and fast.
HSL to HEX Converter - Online Hue Saturation Lightness to Hex
Convert HSL and HSLA color specifications back to standard HEX codes. Useful when extracting colors from CSS preprocessors. Instant client-side conversion.
Color to CIELAB Converter - Online Perceptual Space
Convert hex or RGB to CIELAB L*a*b* values. Understand perceptual lightness and color opponents. Local math.