A comprehensive offline reference application designed for printing professionals, graphic designers, and anyone working with print production. This app provides essential calculation tools and reference guides to ensure your print projects meet professional standards.

★ KEY FEATURES ★

🎨 COLOR CONVERTER
- Convert between RGB (0-255), CMYK (0-100%), and HEX (#RRGGBB) formats
- Real-time color preview with visual display
- Bidirectional conversion: RGB ↔ CMYK ↔ HEX
- Accurate color space conversion using industry-standard formulas
- Quick reference buttons for 8 common colors (Black, White, Red, Green, Blue, Cyan, Magenta, Yellow)
- Scientific accuracy with proper color clamping and normalization
- Essential for preparing designs for professional CMYK printing

📄 PAPER SIZE CALCULATOR
- Calculate paper dimensions with metric and imperial units
- Support for custom dimensions in millimeters
- Automatic conversion to inches (1 inch = 25.4mm exactly)
- Paper area calculation in square meters and square inches
- Paper weight calculation based on GSM (grams per square meter)
- Quick access to 10 standard paper sizes: A0, A1, A2, A3, A4, A5, A6, Letter, Legal, Tabloid (ISO 216 standard)
- Calculates weight in grams and ounces for any GSM value
- Perfect for estimating material costs and specifications

🖼️ DPI & RESOLUTION CALCULATOR
- Calculate print size from pixel dimensions and DPI
- Formula: pixels ÷ DPI = inches (industry standard)
- Automatic conversion between inches and centimeters (1 inch = 2.54cm)
- Determine required resolution for target print size
- File size estimation for both RGB (3 bytes) and CMYK (4 bytes) images
- Quality assessment based on DPI: 72 (Screen), 150 (Draft), 200 (Standard), 300 (Professional), 600+ (High-End)
- Megapixel calculation for image dimensions
- Common print size presets with correct calculations:
- 4×6 Photo (1200×1800 @ 300 DPI)
- 5×7 Photo (1500×2100 @ 300 DPI)
- 8×10 Photo (2400×3000 @ 300 DPI)
- A4 Document (2480×3508 @ 300 DPI)
- 24×36 Poster (7200×10800 @ 300 DPI)
- Essential for ensuring image quality meets print requirements

📐 ASPECT RATIO & CROP CALCULATOR
- Calculate and simplify aspect ratios using GCD (Greatest Common Divisor) with Euclidean algorithm
- Determine resize dimensions while maintaining proportions
- Scale to Fit calculation (no cropping, maintains full image)
- Scale to Fill calculation (covers target area, may require cropping)
- Calculate exact crop requirements when aspect ratios differ
- Automatic detection of common aspect ratios within 5% tolerance
- Scientific formulas:
- GCD: Euclidean algorithm for ratio simplification
- Scale to Fit: min(targetWidth/origWidth, targetHeight/origHeight)
- Scale to Fill: max(targetWidth/origWidth, targetHeight/origHeight)
- Quick presets for 8 standard ratios:
- 1:1 (Square)
- 4:3 (Standard TV)
- 3:2 (Classic Photo/DSLR)
- 16:9 (Widescreen HD)
- 16:10 (Computer Monitor)
- 21:9 (Ultrawide)
- A4 Portrait & Landscape
- Perfect for preparing images for specific print sizes without distortion

📚 PROFESSIONAL PRINTING GUIDE
- Comprehensive glossary of 22 printing terms with detailed definitions
- File format recommendations:
- PDF (PDF/X-1a, PDF/X-4) - Recommended for all print jobs
- TIFF (Uncompressed/LZW) - High-quality raster images
- EPS/AI - Vector graphics for logos
- PSD - Photoshop editing format
- Color mode guide:
- CMYK (Print) - Required for professional printing
- RGB (Screen) - Not suitable for print
- Pantone/PMS - Spot colors for exact matching
- Paper types explained (Coated, Uncoated, Cardstock) with GSM ranges
- Bleed specifications: 3mm (0.125") standard
- Safety margin: 5mm (0.2") from trim edge
- DPI requirements for different print types (72-1200+ DPI)
- 10-point print-ready checklist
- Aspect ratio usage guide for various media formats