NASA Poster Converter for BOOX Note Max

A robust script to resize NASA images for Screen Savers or Notebook Covers, optimized for the BOOX Note Max's 13.3" screen.

This script converts high-resolution, portrait-oriented images—like NASA's Visions of the Future posters—into BOOX-ready 3200×2400 JPEGs optimized for ePaper displays.

Original Poster

Converted for BOOX Note Max

Why This Script?

The original idea came from this Reddit post, which resized NASA posters for older BOOX devices. This script improves upon that with:

• Linux compatibility (vs Windows batch)
• 13.3" BOOX Note Max support (3200×2400 at 300 ppi)
• Flexible options for color/grayscale and custom resolutions
• Better image processing that preserves details
• Robust error handling and user confirmation

Features

• Smart grayscale conversion with detail preservation and Floyd-Steinberg dithering
• No cropping or distortion - images fit perfectly with padding
• Color mode option for color e-readers
• Custom resolution support for any e-ink device
• Dry-run mode to preview settings before processing
• Batch processing with progress feedback
• Quality control with adjustable JPEG compression

Usage

Basic Usage

chmod +x convert_to_booxmax.sh
./convert_to_booxmax.sh

Options

./convert_to_booxmax.sh [OPTIONS] [WIDTH HEIGHT]

OPTIONS:
    --color, -c     Use color mode (default: grayscale)
    --quality, -q   JPEG quality 1-100 (default: 75)
    --dry-run       Show configuration without processing
    --yes, -y       Skip confirmation prompt
    --help, -h      Show help

Examples

Default (grayscale for Note Max):

./convert_to_booxmax.sh

Color mode:

./convert_to_booxmax.sh --color

Custom resolution (Nova Air C 7.8"):

./convert_to_booxmax.sh 1404 1872

Tab Ultra (10.3") with color:

./convert_to_booxmax.sh --color 1872 1404

Check settings before processing:

./convert_to_booxmax.sh --dry-run --color 2400 3200

Batch processing without prompts:

./convert_to_booxmax.sh --yes --quality 85

Supported Formats

Input: .jpg, .jpeg, .png (including uppercase)
Output: High-quality JPEG with _booxmax.jpg suffix

Optional: Upscaling

For older/low-resolution posters, consider upscaling first with Upscayl using 2x-3x Digital Art model if you notice bars or stretching.

Requirements

• ImageMagick (magick command)
• Bash shell
• Image files in current directory