Image Pixel Color Picker and Magnifier
Select any pixel in a local image, inspect an 11×11 grid at up to 20× zoom and copy HEX, RGB or HSL; use the native screen picker when available.
About this image pixel color picker and magnifier
Select any pixel in a local image, inspect an 11×11 grid at up to 20× zoom and copy HEX, RGB or HSL; use the native screen picker when available Processes media assets directly in the browser using HTML5 Canvas and WebAssembly decoders, ensuring zero file uploads.
Image processing & canvas pipeline
Computes color space transformations and accessibility metrics conforming to W3C CSS Color Module Level 4, CIE 1931 XYZ, sRGB, HSL, HSV, CIELAB, and WCAG 2.1 contrast guidelines. Contrast ratios calculate relative luminance ($L = 0.2126R + 0.7152G + 0.0722B$) with gamma expansion, enforcing minimum ratios of 4.5:1 for standard text (Level AA) and 7:1 for enhanced text (Level AAA). Color blindness simulations evaluate 3x3 spectral transformation matrices for Protanopia, Deuteranopia, Tritanopia, and Achromatopsia.
Worked image transformation example
Scenario: Read the center pixel of an 8×8 test PNG.
Sample input:
Processing: Canvas reads pixel floor(8/2), floor(8/2).
Illustrative output:
Resolution, dimension & memory limits
Operational constraints and validation boundaries: Local PNG/JPEG/WebP smaller than 40 MB; sides at most 4096px and total at most 8,388,608 pixels. Integer zoom 1–20. Sampling uses decoded Canvas pixels, so transparent-pixel RGB and color profiles may differ from encoded source data. Screen picker and clipboard require browser support/permission and usually a secure context. No remote URLs, SVG, animation, file export or calibrated color measurement. Native OS screen chooser, physical touch, other browsers, near-limit memory stress and native-language review remain unverified.
Image Pixel Color Picker and Magnifier image operations execute in client memory via HTML5 Canvas and browser decoders. Inspect output previews before replacing source assets.
In-memory image processing boundary
File buffers and document assets in Image Pixel Color Picker and Magnifier are processed in-memory via local browser APIs with zero file uploads to CZOA servers.
Image format & W3C Canvas standards
W3C Canvas 2D context specifications and standard image container formats:
- WHATWG Canvas 2D
- CSS Color 4
- EyeDropper API
Image Pixel Color Picker and Magnifier verification · Audit standards
How to use it
- Enter, paste, or select your input data into the Image Pixel Color Picker and Magnifier workspace controls.
Frequently asked questions
How do pixel alignment, color formats and screen sampling work?+
Operational requirements for "How do pixel alignment, color formats and screen sampling work?" are verified in local memory during execution of Image Pixel Color Picker and Magnifier.
What controls does Image Center-Pixel Color Reader provide?+
Choose an image and click a pixel. Focus the image and use arrow keys for one-pixel steps; positions are zero-based. The magnifier shows 11×11 source pixels centered on the selection, with a highlighted center cell; grid lines appear from 4×. Zoom changes only the magnifier. HEX/RGB ignore alpha; alpha is shown separately. HSL uses decoded 8-bit RGB, rounded to one decimal. Example: opaque red at (0,0) is #ff0000, rgb(255, 0, 0), hsl(0, 100%, 50%), alpha 255. Copy buttons use the clipboard. Screen picker returns a separate sRGB color and does not change the image selection; Escape cancels. The original center-pixel JSON stays below.
What limits apply to center-pixel color reading?+
Local PNG/JPEG/WebP smaller than 40 MB; sides at most 4096px and total at most 8,388,608 pixels. Integer zoom 1–20.
What does the current source review establish for center-pixel reading?+
Original center-pixel JSON: In the supplied 8×8 PNG, the center pixel at (4,4) is #1b6654 with alpha 255. This example shows center-pixel sampling after an image decodes; other files depend on browser image support and may have different color values. The tool does not sample your screen or arbitrary coordinates.