TECHNICAL_DEEP_DIVE

16x Upscaling Quality Metrics

Quality Standards for Industrial Textile Printing

Sapphire 16x Upscale Engine elevates low-resolution patterns to industrial print quality. This page explains the quality metrics we use and why they matter.

Quality Metrics

SSIM (Structural Similarity Index)

≥ 0.85

Structural similarity measurement based on human visual perception. 1.0 = perfect match.

Guarantees preservation of pattern details.

PSNR (Peak Signal-to-Noise Ratio)

≥ 30 dB

Signal-to-noise ratio. Higher value = less distortion.

Ensures clean results in gradient transitions.

ΔE00 (Color Difference)

< 3.0

CIEDE2000 color difference. <1 = imperceptible, <3 = acceptable.

Maintains color accuracy at textile standards.

Edge Sharpness

Preserved

Edge sharpness analysis. Post-upscale blur control.

Provides sharp lines in geometric patterns.

Two-Stage Upscale Pipeline

Real-ESRGAN (Pattern-Tuned)

4x or 8x enlargement. Model specially trained for textile patterns.

Neural Network, fine-tuned on 50K+ textile patterns

Sapphire Polish Diffusion

2x final refinement. Micro-detail and edge correction.

Diffusion-based refinement, SSIM-optimized

Total: 16x enlargement (e.g., 1024px → 16,384px)

Sapphire vs Generic Upscalers

Feature	Sapphire	Generic AI Upscaler
Textile Optimization	Yes (50K+ patterns)	No
SSIM Target	≥0.85 guaranteed	Variable
Seamless Repeat	Preserved	May break
Max Resolution	16,000px	Usually 4,000px
Print DPI	300+ DPI	Variable

Technical Specifications

Input Resolution: Minimum 512×512px recommended
Output Resolution: Up to 16,384×16,384px
Enlargement Factors: 2x, 4x, 8x, 16x
Processing Time: 30-90 seconds (size dependent)
Format: PNG, TIFF (output)
Credit Cost: 3-4 credits (based on scale factor)

Upscale Your Pattern

Make your low-resolution files print-ready.

Start Upscale