{
  "project": "Kingy AI Image Canvas Atlas",
  "checked_at": "2026-09-07",
  "claims": [
    {"id": "cover", "claim": "A cover constraint preserves the preferred aspect ratio and fills the target rectangle on both axes.", "source": "W3C CSS Images Module Level 3", "url": "https://www.w3.org/TR/css-images-3/#the-object-fit", "type": "standard"},
    {"id": "print-math", "claim": "Image resolution in PPI relates pixel dimensions to physical print dimensions; printer DPI is a different measure.", "source": "Adobe Photoshop Help", "url": "https://helpx.adobe.com/photoshop/kb/advanced-cropping-resizing-resampling-photoshop.html", "type": "primary-documentation"},
    {"id": "300-ppi", "claim": "300 PPI is a common high-quality print reference, while acceptable resolution depends on output and viewing distance.", "source": "Adobe Photoshop Help", "url": "https://helpx.adobe.com/photoshop/desktop/crop-resize-transform/resize-adjust-resolution/resolution-specs-for-printing-images.html", "type": "primary-documentation"},
    {"id": "youtube-presets", "claim": "YouTube recommends 3840×2160/16:9 for video thumbnails and 2160×3840/9:16 for Shorts thumbnails as of the checked date.", "source": "YouTube Help", "url": "https://support.google.com/youtube/answer/72431?hl=en", "type": "official-platform-preset"}
  ],
  "derived_calculations": [
    {"name": "megapixels", "formula": "target_width_px × target_height_px ÷ 1,000,000"},
    {"name": "cover_crop_loss", "formula": "1 − surviving_source_area ÷ original_source_area"},
    {"name": "render_scale", "formula": "target_width_px ÷ surviving_source_width_px"},
    {"name": "effective_print_ppi", "formula": "target_width_px ÷ print_width_inches"}
  ],
  "boundary": "The calculator reports deterministic geometry from entered dimensions. It does not predict perceived quality, content-aware crop quality, resampling quality, printer behavior, or platform processing."
}