Click to Enter Fullscreen Test
Observe if color banding exists in gradients
Direction
Step Count
SmoothVideo Compression
YouTube etc. introduce false banding
GPU Direct
CSS gradients, zero compression
Panel Detection
Smooth still banding = 6-bit panel
Professional Color Banding Detection Tool
No downloads needed — detect display banding issues precisely using lossless GPU-rendered gradients right in your browser.
Six Gradient Modes
Greyscale, RGB channels, shadow detail, highlight detail — six complementary gradient modes exposing panel color banding and quantization artifacts from different gamut dimensions.
Zero-Compression Lossless
CSS gradients rendered directly by the GPU, bypassing video codecs. Unlike YouTube test videos where lossy compression introduces false banding, this tool shows your screen's true performance.
Step Count Simulation
Continuously adjustable 0-64 step count simulates everything from smooth gradients to extreme quantization. Precisely identify panel bit depth and dithering algorithm effectiveness.
What Is Color Banding?
Understanding the causes of banding helps you correctly judge whether you're seeing a panel limitation or a content issue.
Panel Quantization Banding
When a display panel's color bit depth is insufficient (e.g., 6-bit panels with only 64 grey levels), visible color "steps" appear in what should be smooth gradients. This is a hardware physical limitation that software cannot fix. 8-bit panels have 256 levels, 10-bit have 1024 — higher bit depth makes banding invisible.
FRC Dithering Artifacts
Many panels labeled "8-bit" are actually 6-bit + FRC (Frame Rate Control dithering). By rapidly alternating between two colors across adjacent frames, intermediate colors are simulated — imperceptible at normal viewing distance. But on large gradients or at low refresh rates, FRC may produce noise or flicker.
Compression-Induced False Banding
H.264/H.265 and other video codecs compress gradient regions poorly, easily introducing quantization artifacts in originally smooth transitions — this is why YouTube screen test videos are often inaccurate. This tool uses CSS gradients to completely avoid this issue.
How to Detect Color Banding
Three steps to quickly assess panel color capability.
Select Gradient Mode
After entering fullscreen, start with greyscale gradient (most banding-sensitive). Then test RGB channels sequentially, observing whether transitions are smooth in each color domain.
Adjust Step Count
Gradually increase steps from 0 (smooth). If banding is visible at the "smooth" setting, it's a panel hardware limitation. If only visible after adding steps, it's just the simulation effect.
Shadow & Highlight Detail
Switch to shadow (0-51) and highlight (204-255) modes. These two ranges expose banding most easily — shadow banding is particularly distracting in film and video content.
Six Gradient Modes Explained
Greyscale
Pure black to white 256-level grey transition. Greyscale gradients are most sensitive to banding — human eyes detect steps most strongly in achromatic brightness changes. The most fundamental and effective detection mode.
Red/Green/Blue (RGB)
Tests individual color channels from full dark to full brightness. Single-channel tests independently evaluate each sub-pixel's grey level capability. Some panels may perform worse in specific channels (e.g., blue channel dithering more visible).
Shadow Detail
Tests only the 0-51 (~first 20%) brightness range. Shadow area is the panel's weakest zone — quantization errors have proportionally greater impact at low values. 6-bit panels have only ~12 usable grey levels in the shadows.
Highlight Detail
Tests only the 204-255 (~last 20%) brightness range. Highlight banding may affect comfort when browsing white-background web pages or reading documents. 10-bit panels show especially clear advantages in highlights.
Panel Bit Depth Comparison
Understanding color performance differences across panel specifications.
6-bit (Native)
Color Capability:
• Very obvious banding in gradients — visible steps in large transition areas.
• Primarily found in entry-level laptop screens and budget monitors.
• FRC dithering can simulate 8-bit, but may still show through in large gradients.
8-bit (Mainstream)
Color Capability:
• Meets all sRGB gamut needs — banding rarely visible in daily use.
• Standard for mainstream monitors and phone screens.
• May still show slight banding in extreme shadow gradients.
10-bit (Professional)
Color Capability:
• Covers all HDR content precision needs — transitions are nearly perfectly smooth.
• Standard requirement for professional photo editing, video color grading, and medical imaging.
• Requires 10-bit compatible GPU + cable + driver support.
12-bit (Flagship)
Color Capability:
• Highest standard required by Dolby Vision — supported by very few flagship TVs.
• Human eyes at normal viewing distance cannot distinguish 12-bit from 10-bit.
• Primarily used in mastering-grade reference monitors for content production.
Practical Tips to Reduce Color Banding
Check Output Bit Depth
Confirm output is set to 8-bit or 10-bit in GPU settings. Windows may default to 6-bit — manually switching unlocks your panel's best performance.
Use Proper Cables
HDMI 2.0+ or DP 1.4+ required for 10-bit color depth output. Old cables may silently downgrade, wasting panel capability.
Enable Dithering
The "dithering" option in GPU driver settings can mitigate banding on low bit-depth panels. Unlike FRC, this is software-level render optimization.
Calibrate Color Profile
Using a colorimeter to generate an ICC profile can improve color precision. Some ICC profiles also optimize gradient area smoothness.
Frequently Asked Questions
Q.Can color banding be fixed?
Banding determined by native panel bit depth cannot be software-fixed. But you can maximize panel performance by enabling GPU dithering, using correct output bit depth, and choosing proper cables. 6-bit + FRC panels with dithering enabled perform close to native 8-bit.
Q.Why are YouTube test videos inaccurate?
YouTube uses VP9/AV1 codecs with very high compression ratios in gradient regions, introducing massive quantization artifacts (false banding). Even native 10-bit panels show obvious banding in YouTube gradient videos — that's a codec issue, not a screen issue.
Q.How do I tell if my panel is 6-bit or 8-bit?
In this tool's "smooth" mode, observe the greyscale gradient: if you see obvious step-like blocks, it's likely 6-bit (+FRC). If the gradient is very smooth, it's native 8-bit or higher. Switching to shadow mode provides more precise testing.
Q.Is a 10-bit screen really necessary?
For HDR content (movies, games) and professional work (photo editing, color grading), 10-bit provides visibly noticeable improvement. For daily office and web browsing, 8-bit is more than sufficient. Users with lots of dark scene content benefit most from 10-bit.
Q.What's the difference between FRC and GPU dithering?
FRC is panel hardware-level dithering that alternates between two colors across consecutive frames to simulate intermediates. GPU dithering is driver-level spatial/temporal dithering applied during rendering. Both can be used together for complementary benefits.
Q.Why is shadow banding more visible than highlight banding?
Human eyes are far more sensitive to shadow color changes than highlights (Weber-Fechner law). The same 1-level grey step difference is much more perceptible at RGB values 10→11 than at 200→201. This is why shadow gradients are the strictest detection scenario.
Display Color Optimization Tips
- • Output Settings: Windows Display Settings → Advanced Display → Display Adapter Properties → List All Modes, select the highest color depth option.
- • Driver Updates: NVIDIA/AMD driver updates sometimes fix color processing bugs. Keep the latest stable driver version.
- • Content Selection: When watching HDR content, ensure both the player and system have HDR mode enabled — otherwise even 10-bit panels can't show their advantage.
- • Ambient Light: Color banding is more perceptible in dark rooms. Appropriate ambient light during daily use can reduce the visual perception of banding.