Reference Canvas Board is a lightweight desktop visual moodboard, color study, and tonal value workspace built for digital illustrators, concept artists, and designers. An independent Linux desktop alternative to PureRef for organizing artist reference boards, performing tonal value checks, and exporting portable project archives.

Key Features:

• Infinite Reference Canvas: Pan and zoom smoothly across an unlimited studio canvas containing reference image cards and sticky text notes with move, scale, rotate, horizontal/vertical mirror flip, non-destructive grayscale value check, tidy auto-pack and auto-grid arrangers, and an always-on-top window pin.
• Eyedropper Color Swatch & Value Histogram: Sample real pixel colors in HEX, RGB, HSV, and relative luminance percentage or extract dominant palettes directly from reference images alongside a 256-bin luminance histogram, and export to GIMP Palette (.gpl), CSS custom properties, or JSON.
• Portable .rcb Archive & Sheet Exporter: Save and reload self-contained .rcb ZIP archives embedding all transforms, sticky notes, palettes, and source images, and render full-board high-resolution PNG posters and PDF sheets.

Disclaimer: This project is an independent open-source tool and is not affiliated with, sponsored by, or endorsed by Idyllic Pixel AB or PureRef.