RGB Test
- Channel luminance ratio ≈ 21:72:7 (green brightest)
- RGB Stripe — standard, sharp text
- Pentile RGBG — ~30% density loss
- BGR — colored fringes under ClearType
Professional RGB Test
Isolated primaries
Fullscreen R/G/B one by one — single-channel dead pixels and decay show instantly.
Channel gradients
Smooth 0-255 per-channel ramps reveal banding from gamma inconsistency.
Additive mixing
Yellow/cyan/magenta in a row makes white balance and dead channels obvious.
RGB Channel Basics
Subpixels
Each pixel is R/G/B subpixels with luminance ratio ≈21:72:7 — green contributes most.
Subpixel layout
RGB Stripe is sharp; Pentile RGBG trades density for lifespan; BGR needs ClearType flip.
Channel gamma
Mismatched channel gamma tints the grayscale: red shadows or cyan highlights are the symptom.
How to Use
Check each channel
←→ cycles fullscreen R/G/B — find defects visible under one color only.
Study the gradient
Ramps should be smooth; visible bands mean depth or gamma issues.
Verify mixed colors
Yellow/cyan/magenta should be equally bright; a dim one marks channel decay.
Subpixel Layouts
RGB Stripe
Desktop standard
- + Sharpest text
- + Perfect ClearType
- − None
Pentile RGBG
OLED phones
- + Longer lifespan
- + Cheaper
- − -30% density
- − Fuzzy small text
BGR
Some monitors
- + Same image quality
- − ClearType needs flipping
QD-OLED tri
New panels
- + Huge color volume
- − Slight text fringing
Optimization Tips
Re-run the Windows ClearType tuner if text shows colored fringes.
On Pentile screens raise font size or enable subpixel antialiasing.
If one channel is globally dim, check GPU panel channel gains first.
Use this tool with GPU RGB gains to fine-tune white balance.
FAQ
Test Environment
- Normal room light is fine
- Phone macro reveals subpixels up close
- Hold each primary 5+ seconds
- Cross-check with colorimeter data
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