{
  "version": 1,
  "name": "Paper & Scale controlled print-resolution specimen",
  "canonicalSource": "https://paper-and-scale.com/guides/print-resolution-test/",
  "description": "An original generated monochrome type, hatch, concentric-detail and line/tone specimen, sampled at four densities for the same physical square.",
  "physicalSizeMm": {
    "width": 50.8,
    "height": 50.8
  },
  "master": {
    "filename": "master-2400px.png",
    "width": 2400,
    "height": 2400,
    "mode": "L",
    "ppiAtProofSize": 1200
  },
  "method": {
    "master": "Pillow ImageDraw geometric primitives and the existing local Bodoni Moda font, drawn once on an opaque white 2400 x 2400 grayscale canvas.",
    "samples": "Each sample is independently reduced directly from the master using Pillow Image.Resampling.LANCZOS. No sample is derived from another sample. No sharpening, artificial blur, contrast change or per-sample edit is applied.",
    "pngEncoding": "Lossless PNG; original samples retain their native 8-bit grayscale pixels. No PPI metadata is used to determine size; PDF placement sets the physical dimensions.",
    "overviews": "The comparison and social graphics place the actual sample images at equal displayed square sizes, each resized with LANCZOS. These presentation images are scaled screen comparisons, not native-resolution or actual-size print proofs.",
    "pdf": "Four native raster image XObjects are placed at exactly 144 x 144 PDF points (50.8 mm square), with Interpolate false and ViewerPreferences PrintScaling None. A vector 100 mm gauge checks printed scale."
  },
  "assumptions": [
    "PPI describes source image pixels per intended printed inch, not printer dots per inch.",
    "Responsive previews and browser interpolation do not establish physical printed size or printer quality.",
    "Print-driver scaling and interpolation can change output despite PDF preferences. Measure the gauge.",
    "No physical printer test, colour profiling, ISO resolution-target conformance or quality certification is claimed."
  ],
  "generator": {
    "path": "scripts/resolution-assets.py",
    "sha256": "421566f75b0bdf403d53f2d1532e9a338f1fa8c1c811ac4e03ebd14aba067436",
    "python": "3.12.14",
    "pillow": "12.3.0",
    "reportlab": "4.4.9",
    "pypdf": "6.10.0",
    "freetype": "2.14.3",
    "font": {
      "path": "src/fonts/bodoni-moda-latin.woff2",
      "sha256": "c032219ef636f7b4932f7d1dc91bdab602c970f090770b546bea4effaab3463c",
      "family": "Bodoni Moda",
      "licenceFile": "src/fonts/OFL.txt"
    }
  },
  "files": {
    "master-2400px.png": {
      "sha256": "baf312785be85f4585e566cb9c1b54bb25f1f9592ad3bd0a4ff4ea74bf44d161",
      "bytes": 113402,
      "mediaType": "image/png",
      "width": 2400,
      "height": 2400,
      "mode": "L"
    },
    "resolution-150ppi.png": {
      "sha256": "665a8763456fd034f0c9871ef9668303e9062d503484f8c0798b3dfa6802532a",
      "bytes": 19342,
      "mediaType": "image/png",
      "width": 300,
      "height": 300,
      "mode": "L",
      "ppi": 150,
      "physicalWidthMm": 50.8,
      "physicalHeightMm": 50.8,
      "source": "master-2400px.png",
      "resampling": "Pillow Image.Resampling.LANCZOS, directly from the master"
    },
    "resolution-300ppi.png": {
      "sha256": "4b2b3225ec198c244920e1ad80307afccc0ad7a7aa3c78b2d4de7c27ae168711",
      "bytes": 58453,
      "mediaType": "image/png",
      "width": 600,
      "height": 600,
      "mode": "L",
      "ppi": 300,
      "physicalWidthMm": 50.8,
      "physicalHeightMm": 50.8,
      "source": "master-2400px.png",
      "resampling": "Pillow Image.Resampling.LANCZOS, directly from the master"
    },
    "resolution-600ppi.png": {
      "sha256": "5257b2643a7b138bdd28863118a5730b5d26465ec4e55df646635b86e9f027b4",
      "bytes": 131686,
      "mediaType": "image/png",
      "width": 1200,
      "height": 1200,
      "mode": "L",
      "ppi": 600,
      "physicalWidthMm": 50.8,
      "physicalHeightMm": 50.8,
      "source": "master-2400px.png",
      "resampling": "Pillow Image.Resampling.LANCZOS, directly from the master"
    },
    "resolution-72ppi.png": {
      "sha256": "4cf2d9470849da7768942df896d000904fdab00f239668b1bd2b2ad725529c6f",
      "bytes": 5957,
      "mediaType": "image/png",
      "width": 144,
      "height": 144,
      "mode": "L",
      "ppi": 72,
      "physicalWidthMm": 50.8,
      "physicalHeightMm": 50.8,
      "source": "master-2400px.png",
      "resampling": "Pillow Image.Resampling.LANCZOS, directly from the master"
    },
    "resolution-comparison.png": {
      "sha256": "af60fcc3361f78813bb1637501ebbac5daecb04c19a24191da10b54087293585",
      "bytes": 176704,
      "mediaType": "image/png",
      "width": 1200,
      "height": 900,
      "mode": "RGB"
    },
    "resolution-proof-a4.pdf": {
      "sha256": "4950eca809107fe20ddf31136229ef23a25305f22a362c81752f023dfdf4fe14",
      "bytes": 258223,
      "mediaType": "application/pdf",
      "sheetWidthMm": 210,
      "sheetHeightMm": 297,
      "pages": 1,
      "printScaling": "None",
      "imageInterpolation": false,
      "panels": [
        {
          "ppi": 72,
          "pixelWidth": 144,
          "pixelHeight": 144,
          "xMm": 45.2,
          "yFromBottomMm": 185.2,
          "widthMm": 50.8,
          "heightMm": 50.8
        },
        {
          "ppi": 150,
          "pixelWidth": 300,
          "pixelHeight": 300,
          "xMm": 114,
          "yFromBottomMm": 185.2,
          "widthMm": 50.8,
          "heightMm": 50.8
        },
        {
          "ppi": 300,
          "pixelWidth": 600,
          "pixelHeight": 600,
          "xMm": 45.2,
          "yFromBottomMm": 107.2,
          "widthMm": 50.8,
          "heightMm": 50.8
        },
        {
          "ppi": 600,
          "pixelWidth": 1200,
          "pixelHeight": 1200,
          "xMm": 114,
          "yFromBottomMm": 107.2,
          "widthMm": 50.8,
          "heightMm": 50.8
        }
      ],
      "gauge": {
        "xMm": 55,
        "yFromBottomMm": 86,
        "lengthMm": 100
      },
      "sourceUrl": "https://paper-and-scale.com/guides/print-resolution-test/"
    },
    "resolution-proof-letter.pdf": {
      "sha256": "f36917ce203c134c5c23cd1e991f2bb3b813d5e5b54cf1e593d175234be5ac9b",
      "bytes": 258212,
      "mediaType": "application/pdf",
      "sheetWidthMm": 215.9,
      "sheetHeightMm": 279.4,
      "pages": 1,
      "printScaling": "None",
      "imageInterpolation": false,
      "panels": [
        {
          "ppi": 72,
          "pixelWidth": 144,
          "pixelHeight": 144,
          "xMm": 48.150000000000006,
          "yFromBottomMm": 167.59999999999997,
          "widthMm": 50.8,
          "heightMm": 50.8
        },
        {
          "ppi": 150,
          "pixelWidth": 300,
          "pixelHeight": 300,
          "xMm": 116.95,
          "yFromBottomMm": 167.59999999999997,
          "widthMm": 50.8,
          "heightMm": 50.8
        },
        {
          "ppi": 300,
          "pixelWidth": 600,
          "pixelHeight": 600,
          "xMm": 48.150000000000006,
          "yFromBottomMm": 89.59999999999998,
          "widthMm": 50.8,
          "heightMm": 50.8
        },
        {
          "ppi": 600,
          "pixelWidth": 1200,
          "pixelHeight": 1200,
          "xMm": 116.95,
          "yFromBottomMm": 89.59999999999998,
          "widthMm": 50.8,
          "heightMm": 50.8
        }
      ],
      "gauge": {
        "xMm": 57.95,
        "yFromBottomMm": 68.39999999999998,
        "lengthMm": 100
      },
      "sourceUrl": "https://paper-and-scale.com/guides/print-resolution-test/"
    },
    "resolution-social.png": {
      "sha256": "e25d8aab2a6c47a7fc83e4ff2b7ba3e749026aa873b6dc0423e2ec5fad630082",
      "bytes": 134740,
      "mediaType": "image/png",
      "width": 1200,
      "height": 630,
      "mode": "RGB"
    }
  },
  "publication": {
    "canonicalPage": "https://paper-and-scale.com/guides/print-resolution-test/",
    "images": [
      {
        "sourceName": "master-2400px.png",
        "url": "https://paper-and-scale.com/images/master-2400px.baf312785b.png",
        "sha256": "baf312785be85f4585e566cb9c1b54bb25f1f9592ad3bd0a4ff4ea74bf44d161",
        "bytes": 113402
      },
      {
        "sourceName": "resolution-150ppi.png",
        "url": "https://paper-and-scale.com/images/resolution-150ppi.665a876345.png",
        "sha256": "665a8763456fd034f0c9871ef9668303e9062d503484f8c0798b3dfa6802532a",
        "bytes": 19342
      },
      {
        "sourceName": "resolution-300ppi.png",
        "url": "https://paper-and-scale.com/images/resolution-300ppi.4b2b3225ec.png",
        "sha256": "4b2b3225ec198c244920e1ad80307afccc0ad7a7aa3c78b2d4de7c27ae168711",
        "bytes": 58453
      },
      {
        "sourceName": "resolution-600ppi.png",
        "url": "https://paper-and-scale.com/images/resolution-600ppi.5257b2643a.png",
        "sha256": "5257b2643a7b138bdd28863118a5730b5d26465ec4e55df646635b86e9f027b4",
        "bytes": 131686
      },
      {
        "sourceName": "resolution-72ppi.png",
        "url": "https://paper-and-scale.com/images/resolution-72ppi.4cf2d94708.png",
        "sha256": "4cf2d9470849da7768942df896d000904fdab00f239668b1bd2b2ad725529c6f",
        "bytes": 5957
      },
      {
        "sourceName": "resolution-comparison.png",
        "url": "https://paper-and-scale.com/images/resolution-comparison.af60fcc336.png",
        "sha256": "af60fcc3361f78813bb1637501ebbac5daecb04c19a24191da10b54087293585",
        "bytes": 176704
      },
      {
        "sourceName": "resolution-social.png",
        "url": "https://paper-and-scale.com/images/resolution-social.e25d8aab2a.png",
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    ]
  }
}