# Colortune — Monitor Calibration Suite

> Colortune is a free, fully client-side web application for testing and calibrating computer displays. It guides users through professional test patterns for brightness, contrast, gamma, color/RGB balance, sharpness, dead/stuck pixels, panel uniformity (backlight bleed), motion/ghosting (response time), color vision, and typography legibility. The UI is trilingual (English, Persian/فارسی, Arabic/العربية) with full right-to-left support, installs as a PWA, and works offline. No account, login, API key, or server is required.

Colortune runs entirely in the browser. It does not collect, transmit, or store any user data on a server; calibration profiles are saved only in the browser's localStorage. The production app is a static single-page application (Vite + React) and the active language is reflected in the URL via the `?lang=` query parameter (e.g. `?lang=en`, `?lang=fa`, `?lang=ar`).

Primary use cases: calibrating a new monitor, checking a panel for defects before/after purchase, validating color accuracy for design work, evaluating gaming monitor motion clarity, and verifying UI accessibility for color-vision deficiencies.

## Calibration tests

- [Brightness & black level](https://colortune.ir/): Adjust the lowest luminance so deep shadow detail is visible without raising blacks to gray. Uses fine grayscale steps from 0% to 15%.
- [Contrast & white level](https://colortune.ir/): Tune highlight luminance so near-white levels (95%–100%) stay distinct without clipping.
- [Gamma correction](https://colortune.ir/): Match the display to the sRGB standard gamma of 2.2 using striped scanline circles; the chosen value is recorded into the saved profile.
- [Color balance & temperature](https://colortune.ir/): Check RGB primary ramps and a neutral-gray bar; target 6500K (D65) for general work.
- [Sharpness & pixel phase](https://colortune.ir/): Verify crisp text edges without halos using high-frequency checkerboard grids.
- [Dead & stuck pixel test](https://colortune.ir/): Cycle full-screen solid colors (red, green, blue, white, black, cyan, magenta, yellow, gray) in fullscreen to reveal defective pixels.
- [Panel uniformity & backlight bleed](https://colortune.ir/): Inspect full-screen black and gray fields for IPS glow, clouding, tint shifts, and dirty-screen effect.
- [Motion, ghosting & response time (UFO test)](https://colortune.ir/): Watch moving objects to judge response time, trailing, and overdrive overshoot.
- [Color-vision test & simulation](https://colortune.ir/): Read Ishihara-style plates and apply protanopia, deuteranopia, tritanopia, and achromatopsia filters to preview how interfaces appear to color-blind users.
- [Gradient & color banding](https://colortune.ir/): Smooth gradients reveal panel bit-depth (6-bit+FRC vs 8/10-bit) and dithering quality.
- [Color gamut & white point](https://colortune.ir/): A CIE 1931 chromaticity diagram comparing sRGB/Rec.709, DCI-P3 and Adobe RGB gamuts and D50–D93 reference white points.
- [Resolution, scaling & overscan](https://colortune.ir/): Reports viewport, screen resolution, device pixel ratio and effective pixels; fullscreen 1:1 grid and overscan/edge-crop test, plus multi-display detection.
- [OLED burn-in & pixel refresh](https://colortune.ir/): Full-screen color washes to reveal image retention, plus a flashing pixel-refresher routine.
- [Refresh rate, frame pacing & tearing](https://colortune.ir/): Measures the actual rendered refresh rate and dropped frames, with a fast vertical-bar tearing/V-Sync test.
- [HDR capability & highlights](https://colortune.ir/): Detects high-dynamic-range support and shows bright peak-highlight patterns.
- [Calibration targets by use case](https://colortune.ir/): Recommended luminance, gamma, white point and color space for photo, video, gaming, office and print workflows.
- [Typography & legibility](https://colortune.ir/): Compare font sizes, line height, font families, and background modes to validate reading comfort and subpixel rendering.

## Features

- [Calibration profiles](https://colortune.ir/?lang=en): Save, list, and delete named calibration profiles in the browser, with JSON and printable PDF export.
- [Fullscreen patterns](https://colortune.ir/?lang=en): Every applicable test opens distraction-free in fullscreen, with keyboard (Space/arrows to cycle, Esc to exit) and click controls.
- [Light & dark theme](https://colortune.ir/?lang=en): Theme and language preferences persist across sessions.
- [Installable PWA](https://colortune.ir/manifest.webmanifest): Add to home screen / desktop and use offline.

## Languages

- [English](https://colortune.ir/?lang=en): Default left-to-right interface.
- [Persian / فارسی](https://colortune.ir/?lang=fa): Right-to-left interface.
- [Arabic / العربية](https://colortune.ir/?lang=ar): Right-to-left interface.

## Optional

- [Sitemap](https://colortune.ir/sitemap.xml): All indexable URLs and language alternates.
- [Web app manifest](https://colortune.ir/manifest.webmanifest): PWA metadata and icons.
- [Publisher: Softmac](https://softmac.ir/): The first Iranian Mac app store, and the organization that maintains Colortune.