{
  "name": "RegiStax 6 Exact Test A -20: 2026-10-18 vs 2026-10-21 vs 2026-10-23",
  "purpose": "Strict same native RegiStax wavelet file across dates, no Topaz, no Gold Mid, no ring whitening, no extra conventional denoising. Decide whether new data is inherently weaker.",
  "wavelet_file": "Oct18_TestA_Minus20_exact.rwv",
  "wavelet_sha256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
  "sliders": [
    25.2,
    15.8,
    7.2,
    0.9,
    0.9,
    0.9
  ],
  "stack": "AutoStakkert 4 10% 1.5x drizzle for all dates",
  "limitations": "Original SER ROI/focal length/seeing/exposure and RegiStax RGB-align/balance/median preprocessing differ by session. These are real pre-Topaz RegiStax outputs with matching spatial-wavelet settings; do not claim all other acquisition variables equal. Oct18 source is raw RegiStax native Test A, NOT the Gold Mid hybrid Test A with inherited Topaz rings.",
  "captures": [
    {
      "night": "Oct18",
      "time": "2301",
      "label": "Oct 18, 11:01 PM",
      "png": "Saturn_Oct18_2301_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.png",
      "tiff": "Saturn_Oct18_2301_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.tif",
      "source_path": "K:\\Data\\ChatGPT\\AllskyBridge\\saturn-work\\comparisons-20261021\\oct18-2301-real-registax-wavelets\\RegiStax_NativeWavelets_A_minus20.tif",
      "source_sha256": "5f3a7ccacb3314aca3e04b3edd1cd01878adc33be0dbda4972a708406d772a0b",
      "width": 480,
      "height": 300,
      "authentic_native_RegiStax6": true,
      "same_exact_RWV_SHA256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "no_look_processing": true,
      "matched_png": "Saturn_Oct18_2301_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_DISPLAY.png",
      "matched_saturn_width_px": 467.0,
      "source_bounding_width_px": 475,
      "source_bounding_height_px": 183,
      "display_resample_scale": 0.983158,
      "display_transform": [
        [
          0.9831578731536865,
          0.0,
          161.58421325683594
        ],
        [
          0.0,
          0.9831578731536865,
          67.03473663330078
        ]
      ],
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.2058824,
          1.0,
          0.9461538
        ],
        "ring_before_bgr_8bit": [
          102.0,
          123.0,
          130.0
        ],
        "ring_after_bgr_8bit": [
          123.0,
          123.0,
          123.0
        ],
        "ring_pixels_used": 5153,
        "original_source_16bit_sha256_unchanged": "5f3a7ccacb3314aca3e04b3edd1cd01878adc33be0dbda4972a708406d772a0b",
        "balanced_tiff": "Saturn_Oct18_2301_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_16bit.tif",
        "balanced_native_png": "Saturn_Oct18_2301_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral.png",
        "balanced_matched_png": "Saturn_Oct18_2301_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_DISPLAY.png",
        "balanced_leveled_png": "Saturn_Oct18_2301_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_LEVEL_OCT18.png"
      }
    },
    {
      "night": "Oct21",
      "time": "2329",
      "label": "Oct 21, 11:29 PM",
      "png": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.png",
      "tiff": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.tif",
      "source_path": "K:\\Data\\ChatGPT\\AllskyBridge\\saturn-work\\session-20261021-evening\\real_profiles\\Saturn_Oct21_2329_P10_RegiStax_Minus20.tif",
      "source_sha256": "b80b4f75aa811d44a7500adf55eae88660337c80fe94d1a4d957a645a5b88c25",
      "width": 624,
      "height": 264,
      "authentic_native_RegiStax6": true,
      "same_exact_RWV_SHA256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "no_look_processing": true,
      "matched_png": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_DISPLAY.png",
      "matched_saturn_width_px": 467.0,
      "source_bounding_width_px": 457,
      "source_bounding_height_px": 184,
      "display_resample_scale": 1.021882,
      "display_transform": [
        [
          1.0218818187713623,
          0.0,
          80.66192626953125
        ],
        [
          0.0,
          1.0218818187713623,
          79.08971405029297
        ]
      ],
      "leveled_png": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_LEVEL_OCT18.png",
      "leveled_for_reference": "Oct18_2301",
      "measured_angle_before_degrees": -12.5435,
      "measured_angle_after_degrees": -0.7943,
      "reference_angle_degrees": -0.5936,
      "display_rotation_opencv_degrees": -11.9499,
      "display_scale_correction_factor": 0.978329,
      "full_single_resample_transform": [
        [
          0.9780714511871338,
          -0.20700156688690186,
          121.88386535644531
        ],
        [
          0.20700156688690186,
          0.9780714511871338,
          20.228498458862305
        ]
      ],
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.1818182,
          1.0,
          0.9454545
        ],
        "ring_before_bgr_8bit": [
          88.0,
          104.0,
          110.0
        ],
        "ring_after_bgr_8bit": [
          104.0,
          104.0,
          104.0
        ],
        "ring_pixels_used": 5200,
        "original_source_16bit_sha256_unchanged": "b80b4f75aa811d44a7500adf55eae88660337c80fe94d1a4d957a645a5b88c25",
        "balanced_tiff": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_16bit.tif",
        "balanced_native_png": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral.png",
        "balanced_matched_png": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_DISPLAY.png",
        "balanced_leveled_png": "Saturn_Oct21_2329_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_LEVEL_OCT18.png"
      }
    },
    {
      "night": "Oct21",
      "time": "2342",
      "label": "Oct 21, 11:42 PM",
      "png": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.png",
      "tiff": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.tif",
      "source_path": "K:\\Data\\ChatGPT\\AllskyBridge\\saturn-work\\session-20261021-evening\\real_profiles\\Saturn_Oct21_2342_P10_RegiStax_Minus20.tif",
      "source_sha256": "b7fab02a8a2329fa701b29ef4357049636bdf7288c4bc2f44cc18b77d5cc3438",
      "width": 624,
      "height": 264,
      "authentic_native_RegiStax6": true,
      "same_exact_RWV_SHA256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "no_look_processing": true,
      "matched_png": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_DISPLAY.png",
      "matched_saturn_width_px": 467.0,
      "source_bounding_width_px": 458,
      "source_bounding_height_px": 184,
      "display_resample_scale": 1.019651,
      "display_transform": [
        [
          1.0196506977081299,
          0.0,
          80.8493423461914
        ],
        [
          0.0,
          1.0196506977081299,
          79.38645935058594
        ]
      ],
      "leveled_png": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_LEVEL_OCT18.png",
      "leveled_for_reference": "Oct18_2301",
      "measured_angle_before_degrees": -12.5237,
      "measured_angle_after_degrees": -0.7892,
      "reference_angle_degrees": -0.5936,
      "display_rotation_opencv_degrees": -11.9301,
      "display_scale_correction_factor": 0.978401,
      "full_single_resample_transform": [
        [
          0.9760786890983582,
          -0.20622731745243073,
          121.91561126708984
        ],
        [
          0.20622731745243073,
          0.9760786890983582,
          20.632387161254883
        ]
      ],
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.1724138,
          1.0,
          0.9444444
        ],
        "ring_before_bgr_8bit": [
          87.0,
          102.0,
          108.0
        ],
        "ring_after_bgr_8bit": [
          102.0,
          102.0,
          102.0
        ],
        "ring_pixels_used": 5141,
        "original_source_16bit_sha256_unchanged": "b7fab02a8a2329fa701b29ef4357049636bdf7288c4bc2f44cc18b77d5cc3438",
        "balanced_tiff": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_16bit.tif",
        "balanced_native_png": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral.png",
        "balanced_matched_png": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_DISPLAY.png",
        "balanced_leveled_png": "Saturn_Oct21_2342_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_LEVEL_OCT18.png"
      }
    },
    {
      "night": "Oct21",
      "time": "2345",
      "label": "Oct 21, 11:45 PM",
      "png": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.png",
      "tiff": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.tif",
      "source_path": "K:\\Data\\ChatGPT\\AllskyBridge\\saturn-work\\session-20261021-evening\\real_profiles\\Saturn_Oct21_2345_P10_RegiStax_Minus20.tif",
      "source_sha256": "72f5b21aab2ee3ab9ae0ea1d65dfe3d2d38a4d6cc573ab4278bba44c90a94cd4",
      "width": 624,
      "height": 264,
      "authentic_native_RegiStax6": true,
      "same_exact_RWV_SHA256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "no_look_processing": true,
      "matched_png": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_DISPLAY.png",
      "matched_saturn_width_px": 467.0,
      "source_bounding_width_px": 458,
      "source_bounding_height_px": 184,
      "display_resample_scale": 1.019651,
      "display_transform": [
        [
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          0.0,
          80.8493423461914
        ],
        [
          0.0,
          1.0196506977081299,
          79.38645935058594
        ]
      ],
      "leveled_png": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_LEVEL_OCT18.png",
      "leveled_for_reference": "Oct18_2301",
      "measured_angle_before_degrees": -12.5361,
      "measured_angle_after_degrees": -0.7906,
      "reference_angle_degrees": -0.5936,
      "display_rotation_opencv_degrees": -11.9426,
      "display_scale_correction_factor": 0.978356,
      "full_single_resample_transform": [
        [
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          -0.20643024146556854,
          121.97071075439453
        ],
        [
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          0.9759888648986816,
          20.5808162689209
        ]
      ],
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.1590909,
          1.0,
          0.953271
        ],
        "ring_before_bgr_8bit": [
          88.0,
          102.0,
          107.0
        ],
        "ring_after_bgr_8bit": [
          102.0,
          102.0,
          102.0
        ],
        "ring_pixels_used": 5148,
        "original_source_16bit_sha256_unchanged": "72f5b21aab2ee3ab9ae0ea1d65dfe3d2d38a4d6cc573ab4278bba44c90a94cd4",
        "balanced_tiff": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_16bit.tif",
        "balanced_native_png": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral.png",
        "balanced_matched_png": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_DISPLAY.png",
        "balanced_leveled_png": "Saturn_Oct21_2345_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_LEVEL_OCT18.png"
      }
    },
    {
      "night": "Oct23",
      "time": "0003",
      "label": "Oct 23, 12:03 AM",
      "png": "Saturn_Oct23_0003_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.png",
      "tiff": "Saturn_Oct23_0003_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.tif",
      "source_path": "K:\\Data\\ChatGPT\\AllskyBridge\\saturn-work\\session-20261022-evening\\published_lab\\Saturn_Oct22_0003_P10_RegiStax_Minus20.tif",
      "source_sha256": "7977671c3add1235a67097750cc794d458e756d54eb6af2e59c28003f8fd28ac",
      "width": 624,
      "height": 264,
      "authentic_native_RegiStax6": true,
      "same_exact_RWV_SHA256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "no_look_processing": true,
      "matched_png": "Saturn_Oct23_0003_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_DISPLAY.png",
      "matched_saturn_width_px": 467.0,
      "source_bounding_width_px": 461,
      "source_bounding_height_px": 180,
      "display_resample_scale": 1.013015,
      "display_transform": [
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          0.0,
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        ],
        [
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        ]
      ],
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.1836735,
          1.0,
          0.9430894
        ],
        "ring_before_bgr_8bit": [
          98.0,
          116.0,
          123.0
        ],
        "ring_after_bgr_8bit": [
          116.0,
          116.0,
          116.0
        ],
        "ring_pixels_used": 5221,
        "original_source_16bit_sha256_unchanged": "7977671c3add1235a67097750cc794d458e756d54eb6af2e59c28003f8fd28ac",
        "balanced_tiff": "Saturn_Oct23_0003_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_16bit.tif",
        "balanced_native_png": "Saturn_Oct23_0003_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral.png",
        "balanced_matched_png": "Saturn_Oct23_0003_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_DISPLAY.png",
        "balanced_leveled_png": "Saturn_Oct23_0003_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_LEVEL_OCT18.png"
      }
    },
    {
      "night": "Oct23",
      "time": "0007",
      "label": "Oct 23, 12:07 AM",
      "png": "Saturn_Oct23_0007_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.png",
      "tiff": "Saturn_Oct23_0007_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.tif",
      "source_path": "K:\\Data\\ChatGPT\\AllskyBridge\\saturn-work\\session-20261022-evening\\published_lab\\Saturn_Oct22_0007_P10_RegiStax_Minus20.tif",
      "source_sha256": "0485600c82bdece982a820b3077bd2daa8040caf01a237b7ab0840b21b378f5a",
      "width": 624,
      "height": 264,
      "authentic_native_RegiStax6": true,
      "same_exact_RWV_SHA256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "no_look_processing": true,
      "matched_png": "Saturn_Oct23_0007_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_DISPLAY.png",
      "matched_saturn_width_px": 467.0,
      "source_bounding_width_px": 461,
      "source_bounding_height_px": 178,
      "display_resample_scale": 1.013015,
      "display_transform": [
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          0.0,
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        ],
        [
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        ]
      ],
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.1818182,
          1.0,
          0.9285714
        ],
        "ring_before_bgr_8bit": [
          99.0,
          117.0,
          126.0
        ],
        "ring_after_bgr_8bit": [
          117.0,
          117.0,
          117.0
        ],
        "ring_pixels_used": 5233,
        "original_source_16bit_sha256_unchanged": "0485600c82bdece982a820b3077bd2daa8040caf01a237b7ab0840b21b378f5a",
        "balanced_tiff": "Saturn_Oct23_0007_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_16bit.tif",
        "balanced_native_png": "Saturn_Oct23_0007_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral.png",
        "balanced_matched_png": "Saturn_Oct23_0007_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_DISPLAY.png",
        "balanced_leveled_png": "Saturn_Oct23_0007_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_RGBBalanced_RingsNeutral_MATCHED_LEVEL_OCT18.png"
      }
    },
    {
      "night": "Oct23",
      "time": "0010",
      "label": "Oct 23, 12:10 AM",
      "png": "Saturn_Oct23_0010_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.png",
      "tiff": "Saturn_Oct23_0010_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native.tif",
      "source_path": "K:\\Data\\ChatGPT\\AllskyBridge\\saturn-work\\session-20261022-evening\\published_lab\\Saturn_Oct22_0010_P10_RegiStax_Minus20.tif",
      "source_sha256": "b5c0668bece97f8d0b8788044b6bd05e5b26215e9591568174ec693dbc10997d",
      "width": 624,
      "height": 264,
      "authentic_native_RegiStax6": true,
      "same_exact_RWV_SHA256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "no_look_processing": true,
      "matched_png": "Saturn_Oct23_0010_AS4P10_Drizzle15_ExactRWV_TestA_Minus20_Native_MATCHED_DISPLAY.png",
      "matched_saturn_width_px": 467.0,
      "source_bounding_width_px": 462,
      "source_bounding_height_px": 179,
      "display_resample_scale": 1.010823,
      "display_transform": [
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          0.0,
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        ],
        [
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          81.0660171508789
        ]
      ],
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.1836735,
          1.0,
          0.9354839
        ],
        "ring_before_bgr_8bit": [
          98.0,
          116.0,
          124.0
        ],
        "ring_after_bgr_8bit": [
          116.0,
          116.0,
          116.0
        ],
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      "wavelet_sha256": "4ea1a5f2ba5a93fede4633b407396866115843c276429d1563041c5065e5a97a",
      "stack_method": "AS3 best 28% 1.5x, archived 2021-08-24 03:55 UT",
      "source_registax_SHA256": "e47efd7ef5193ad48ad6f157725577f39697e8fb58cc3df7de299516b43c4b9f",
      "ring_original_angle_deg": -27.666,
      "reference_angle_deg": -0.694,
      "ring_leveled_deg": -0.696,
      "ring_source_bbox": [
        112,
        97,
        488,
        294
      ],
      "matched_display_ring_width_px": 467,
      "applied_rotation_deg": -26.9713,
      "applied_display_scale": 0.86211,
      "compare_status": "identical_RegiStax_wavelets; distinct original acquisition",
      "strict_same_AS4_P10": false,
      "rgb_balanced": {
        "method": "neutral main-ring wings (gray-world B/R to G, consistently applied to all captures, green unchanged)",
        "distinct_from_RegiStax_GUI_RGB_Balance_Auto": true,
        "bgr_gain": [
          1.2911392,
          1.0,
          1.02
        ],
        "ring_before_bgr_8bit": [
          79.0,
          102.0,
          100.0
        ],
        "ring_after_bgr_8bit": [
          102.0,
          102.0,
          101.0
        ],
        "ring_pixels_used": 13888,
        "original_source_16bit_sha256_unchanged": "e47efd7ef5193ad48ad6f157725577f39697e8fb58cc3df7de299516b43c4b9f",
        "balanced_tiff": "Saturn_Year2021_0355_NativeAS_RegiStax_ExactTestA_minus20_RGBBalanced_RingsNeutral_16bit.tif",
        "balanced_native_png": "Saturn_Year2021_0355_NativeAS_RegiStax_ExactTestA_minus20_RGBBalanced_RingsNeutral.png",
        "balanced_matched_png": "Saturn_Year2021_0355_NativeAS_RegiStax_ExactTestA_minus20_RGBBalanced_RingsNeutral_MATCHED_DISPLAY.png",
        "balanced_leveled_png": "Saturn_Year2021_0355_NativeAS_RegiStax_ExactTestA_minus20_RGBBalanced_RingsNeutral_MATCHED_LEVEL_OCT18.png"
      },
      "user_requested_2021_reference": "2021-08-10 (source not yet located)",
      "verified_archive_capture_date": "2021-08-24",
      "caution": "Do NOT relabel this source as Aug 10. Source traces to T:\\Data\\Captures\\Planetary\\Sat\\2021\\2021_08_24\\... and 03:55 UT SER."
    }
  ],
  "historical_extended_20261023": {
    "count_added": 8,
    "reference_Oct18_ring_angle_deg": -0.694,
    "source_handling": "All inputs genuine native unsharpened stacks, processed via actual RegiStax6 GUI with SHA-identical TestA-20 .rwv; Oct19 LZW compressed archive TIFF bit-exact transcoded for compatibility",
    "limits": "Oct07 uses AS3 P10 (same stack %, different AS version); 2021 uses AS3 P28 due to surviving original, not true P10 source. Ring opening angle 2021 physically different from 2026, display rotation cannot make geometry equivalent.",
    "all_viewed_at_identical_ring_span": true,
    "native_16bit_masters_unmodified": true
  },
  "2021_reference_status": "Aug 10 2021 desired; no Aug 10 original stack/SER recovered from accessible T: B: Z: O: K: archives; Aug24 existing is archive only."
}