{
 "name": "PhotoAIBench upscaler baselines (local open-source methods only)",
 "run_date": "2026-10-07",
 "scale": 4,
 "images": 12,
 "metrics": {
  "psnr_rgb": "dB, higher is better; MSE over R, G, B",
  "psnr_y": "dB, higher is better; BT.601 full-range luma",
  "ssim_y": "Wang et al. 2004, Gaussian sigma 1.5 (11x11), K1 0.01, K2 0.03, L 255, on luma; higher is better",
  "lpips": "Zhang et al. 2018, AlexNet, v0.1; lower is better"
 },
 "versions": {
  "scikit-image": "0.26.0",
  "lpips": "0.1.4",
  "torch": "2.2.2"
 },
 "methods": [
  "bicubic",
  "lanczos",
  "realesrnet-x4plus",
  "realesrgan-x4plus",
  "realesr-general-x4v3"
 ],
 "summary": {
  "bicubic": {
   "images": 12,
   "mean_psnr_rgb": 29.6922,
   "mean_psnr_y": 30.0036,
   "mean_ssim_y": 0.7679,
   "mean_lpips": 0.3858,
   "best_on": {
    "psnr_y": 0,
    "ssim_y": 0,
    "lpips": 0
   }
  },
  "lanczos": {
   "images": 12,
   "mean_psnr_rgb": 29.902,
   "mean_psnr_y": 30.2201,
   "mean_ssim_y": 0.774,
   "mean_lpips": 0.3918,
   "best_on": {
    "psnr_y": 4,
    "ssim_y": 3,
    "lpips": 0
   }
  },
  "realesrnet-x4plus": {
   "images": 12,
   "mean_psnr_rgb": 28.9942,
   "mean_psnr_y": 29.5436,
   "mean_ssim_y": 0.7915,
   "mean_lpips": 0.3508,
   "best_on": {
    "psnr_y": 8,
    "ssim_y": 9,
    "lpips": 0
   }
  },
  "realesrgan-x4plus": {
   "images": 12,
   "mean_psnr_rgb": 26.368,
   "mean_psnr_y": 26.7913,
   "mean_ssim_y": 0.7268,
   "mean_lpips": 0.2261,
   "best_on": {
    "psnr_y": 0,
    "ssim_y": 0,
    "lpips": 12
   }
  },
  "realesr-general-x4v3": {
   "images": 12,
   "mean_psnr_rgb": 27.2518,
   "mean_psnr_y": 27.6632,
   "mean_ssim_y": 0.7626,
   "mean_lpips": 0.3124,
   "best_on": {
    "psnr_y": 0,
    "ssim_y": 0,
    "lpips": 0
   }
  }
 },
 "per_image": {
  "portrait-little-norway-guide": {
   "category": "portrait",
   "size": [
    1452,
    2000
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 37.9764,
     "psnr_y": 38.6545,
     "ssim_y": 0.95106,
     "lpips": 0.15214
    },
    "lanczos": {
     "psnr_rgb": 38.5512,
     "psnr_y": 39.3025,
     "ssim_y": 0.95415,
     "lpips": 0.15066
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 32.251,
     "psnr_y": 32.7074,
     "ssim_y": 0.93917,
     "lpips": 0.1918
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 31.0641,
     "psnr_y": 31.6984,
     "ssim_y": 0.91824,
     "lpips": 0.14279
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 29.7554,
     "psnr_y": 29.9942,
     "ssim_y": 0.92134,
     "lpips": 0.19486
    }
   }
  },
  "portrait-garage-mechanic": {
   "category": "portrait",
   "size": [
    1436,
    2000
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 33.4236,
     "psnr_y": 34.191,
     "ssim_y": 0.91678,
     "lpips": 0.30089
    },
    "lanczos": {
     "psnr_rgb": 33.6522,
     "psnr_y": 34.4328,
     "ssim_y": 0.91884,
     "lpips": 0.29847
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 33.3672,
     "psnr_y": 34.8309,
     "ssim_y": 0.92364,
     "lpips": 0.28232
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 31.1672,
     "psnr_y": 32.5796,
     "ssim_y": 0.89392,
     "lpips": 0.21656
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 31.3408,
     "psnr_y": 32.4627,
     "ssim_y": 0.9036,
     "lpips": 0.2891
    }
   }
  },
  "portrait-walter-white": {
   "category": "portrait",
   "size": [
    1552,
    2000
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 44.1962,
     "psnr_y": 44.5223,
     "ssim_y": 0.97522,
     "lpips": 0.20508
    },
    "lanczos": {
     "psnr_rgb": 44.4198,
     "psnr_y": 44.7791,
     "ssim_y": 0.97555,
     "lpips": 0.20349
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 40.9214,
     "psnr_y": 41.044,
     "ssim_y": 0.97209,
     "lpips": 0.22591
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 37.7313,
     "psnr_y": 37.907,
     "ssim_y": 0.95933,
     "lpips": 0.12318
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 36.807,
     "psnr_y": 36.8067,
     "ssim_y": 0.96552,
     "lpips": 0.19095
    }
   }
  },
  "portrait-graham-bell": {
   "category": "portrait",
   "size": [
    1348,
    2000
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 32.0487,
     "psnr_y": 32.3904,
     "ssim_y": 0.70126,
     "lpips": 0.59283
    },
    "lanczos": {
     "psnr_rgb": 32.1218,
     "psnr_y": 32.4698,
     "ssim_y": 0.70486,
     "lpips": 0.60475
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 31.6444,
     "psnr_y": 32.0381,
     "ssim_y": 0.69532,
     "lpips": 0.64167
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 24.9253,
     "psnr_y": 25.0001,
     "ssim_y": 0.59816,
     "lpips": 0.57028
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 30.9003,
     "psnr_y": 31.2509,
     "ssim_y": 0.67331,
     "lpips": 0.6219
    }
   }
  },
  "landscape-jacques-cartier": {
   "category": "landscape",
   "size": [
    2000,
    1332
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 23.6673,
     "psnr_y": 24.2385,
     "ssim_y": 0.50379,
     "lpips": 0.66232
    },
    "lanczos": {
     "psnr_rgb": 23.7616,
     "psnr_y": 24.3328,
     "ssim_y": 0.51509,
     "lpips": 0.681
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 23.6725,
     "psnr_y": 24.4394,
     "ssim_y": 0.55202,
     "lpips": 0.6026
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 21.6959,
     "psnr_y": 22.208,
     "ssim_y": 0.44375,
     "lpips": 0.28769
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 22.766,
     "psnr_y": 23.4591,
     "ssim_y": 0.50174,
     "lpips": 0.48448
    }
   }
  },
  "landscape-mount-ida": {
   "category": "landscape",
   "size": [
    2000,
    1216
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 26.834,
     "psnr_y": 26.6726,
     "ssim_y": 0.67867,
     "lpips": 0.44639
    },
    "lanczos": {
     "psnr_rgb": 26.982,
     "psnr_y": 26.8159,
     "ssim_y": 0.68833,
     "lpips": 0.46232
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 26.7481,
     "psnr_y": 26.9553,
     "ssim_y": 0.71495,
     "lpips": 0.41053
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 23.7086,
     "psnr_y": 23.743,
     "ssim_y": 0.60751,
     "lpips": 0.21074
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 25.1724,
     "psnr_y": 25.3448,
     "ssim_y": 0.67139,
     "lpips": 0.32894
    }
   }
  },
  "landscape-rio-skyline": {
   "category": "landscape",
   "size": [
    2000,
    1220
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 26.5517,
     "psnr_y": 26.467,
     "ssim_y": 0.77124,
     "lpips": 0.45579
    },
    "lanczos": {
     "psnr_rgb": 26.6831,
     "psnr_y": 26.5991,
     "ssim_y": 0.77553,
     "lpips": 0.46149
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 27.0806,
     "psnr_y": 27.1295,
     "ssim_y": 0.79909,
     "lpips": 0.37386
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 25.3169,
     "psnr_y": 25.3547,
     "ssim_y": 0.75294,
     "lpips": 0.22111
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 25.9379,
     "psnr_y": 25.9828,
     "ssim_y": 0.77695,
     "lpips": 0.33191
    }
   }
  },
  "landscape-sunset-key": {
   "category": "landscape",
   "size": [
    2000,
    1040
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 26.0082,
     "psnr_y": 26.1604,
     "ssim_y": 0.68305,
     "lpips": 0.39263
    },
    "lanczos": {
     "psnr_rgb": 26.0979,
     "psnr_y": 26.2471,
     "ssim_y": 0.68908,
     "lpips": 0.40037
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 26.1366,
     "psnr_y": 26.4289,
     "ssim_y": 0.71442,
     "lpips": 0.35015
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 24.0704,
     "psnr_y": 24.2347,
     "ssim_y": 0.65054,
     "lpips": 0.12819
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 25.095,
     "psnr_y": 25.4112,
     "ssim_y": 0.6798,
     "lpips": 0.27749
    }
   }
  },
  "text-hotel-post-sign": {
   "category": "texture-text",
   "size": [
    1404,
    2000
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 29.2523,
     "psnr_y": 29.7715,
     "ssim_y": 0.88534,
     "lpips": 0.24123
    },
    "lanczos": {
     "psnr_rgb": 29.5776,
     "psnr_y": 30.0876,
     "ssim_y": 0.88864,
     "lpips": 0.23996
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 29.3334,
     "psnr_y": 31.1346,
     "ssim_y": 0.9143,
     "lpips": 0.17077
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 27.1784,
     "psnr_y": 28.4531,
     "ssim_y": 0.87995,
     "lpips": 0.12311
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 26.2428,
     "psnr_y": 27.1512,
     "ssim_y": 0.88577,
     "lpips": 0.17088
    }
   }
  },
  "text-posted-sign": {
   "category": "texture-text",
   "size": [
    2000,
    1332
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 25.6602,
     "psnr_y": 26.0337,
     "ssim_y": 0.79139,
     "lpips": 0.3815
    },
    "lanczos": {
     "psnr_rgb": 26.0357,
     "psnr_y": 26.379,
     "ssim_y": 0.80462,
     "lpips": 0.39451
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 25.9454,
     "psnr_y": 26.4876,
     "ssim_y": 0.82846,
     "lpips": 0.28431
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 23.3667,
     "psnr_y": 23.7889,
     "ssim_y": 0.72655,
     "lpips": 0.24821
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 24.1843,
     "psnr_y": 24.7295,
     "ssim_y": 0.78679,
     "lpips": 0.2523
    }
   }
  },
  "texture-lynx": {
   "category": "texture-text",
   "size": [
    2000,
    1408
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 29.3893,
     "psnr_y": 29.5452,
     "ssim_y": 0.86575,
     "lpips": 0.19801
    },
    "lanczos": {
     "psnr_rgb": 29.5445,
     "psnr_y": 29.7027,
     "ssim_y": 0.87044,
     "lpips": 0.19663
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 29.4491,
     "psnr_y": 29.6282,
     "ssim_y": 0.88553,
     "lpips": 0.19389
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 26.5992,
     "psnr_y": 26.6958,
     "ssim_y": 0.83421,
     "lpips": 0.1197
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 28.3211,
     "psnr_y": 28.5502,
     "ssim_y": 0.87053,
     "lpips": 0.1682
    }
   }
  },
  "texture-golden-chapel": {
   "category": "texture-text",
   "size": [
    2000,
    1932
   ],
   "scores": {
    "bicubic": {
     "psnr_rgb": 21.298,
     "psnr_y": 21.3958,
     "ssim_y": 0.49136,
     "lpips": 0.60075
    },
    "lanczos": {
     "psnr_rgb": 21.396,
     "psnr_y": 21.4933,
     "ssim_y": 0.50338,
     "lpips": 0.60761
    },
    "realesrnet-x4plus": {
     "psnr_rgb": 21.3806,
     "psnr_y": 21.6999,
     "ssim_y": 0.55957,
     "lpips": 0.48187
    },
    "realesrgan-x4plus": {
     "psnr_rgb": 19.5924,
     "psnr_y": 19.8319,
     "ssim_y": 0.45625,
     "lpips": 0.3213
    },
    "realesr-general-x4v3": {
     "psnr_rgb": 20.4989,
     "psnr_y": 20.8152,
     "ssim_y": 0.51393,
     "lpips": 0.43763
    }
   }
  }
 }
}