Encycolorpedia

Dulux Australia Absolute Steel / O5 / #424c51 Barwy Hex

#424c51 Paint ChipSzesnastkowykod kolour #424c51 jest średnio ciemny odcieniem cyjan-niebiesko. W kolorze RGB model #424c51 składa się z 25.88% czerwonego, 29.8% zielonego i 31.76% niebieskiego. W kolorze HSL przestrzeń #424c51 ma odcień 200° (stopni), 10% nasycenie i 29% jasność. Kolor ten ma przybliżoną długość fali 484.35 nm.

Odmiany Kolorów

Nazwane Kolory

Schematy Kolorów

Pobieranie: GIMP GPL Adobe ASE (Adobe Swatch Exchange) Sketch Palette

Kolory monochromatyczne

  1. #363f44
  2. #3a4348
  3. #3e484d
  4. #424c51
  5. #465055
  6. #4b555a
  7. #4f595e

Odcienie kolorów

#424c51 do białego

  1. #424c51
  2. #5e676b
  3. #7c8387
  4. #9ba1a4
  5. #bcbfc1
  6. #dddfe0
  7. #ffffff / #fff

#424c51 do czarnego

  1. #424c51
  2. #384044
  3. #2d3437
  4. #24282a
  5. #1a1d1e
  6. #101213
  7. #000000 / #000

Farba

Dopasowywanie farb

Podobne farby

  1. Jotun

    1. ★ 0730 / Fjellblå
      #414b50
      ΔE = 0.431 / LRV ≈ 6.7%
    2. 4413 / Vinternatt
      #414550
      ΔE = 4.891 / LRV ≈ 6.0%
  2. Asian Paints

    1. ★ Black Sea / 9469
      #424b4f
      ΔE = 0.713 / LRV ≈ 6.8%
    2. After Dark / 9229
      #3d4e58
      ΔE = 3.253 / LRV ≈ 7.1%
  3. Porter Paints

    1. ★ Black Forest / 555-7
      #434b4f
      ΔE = 0.853 / LRV ≈ 6.8%
    2. Midnight Hour / 554-7
      #3a484f
      ΔE = 2.535 / LRV ≈ 6.1%
  4. Taubmans

    1. ★ Dark Eyes / T12 44.H12
      #3e4b51
      ΔE = 1.231 / LRV ≈ 6.7%
    2. Black Fox / T08 171-4
      #434645
      ΔE = 4.578 / LRV ≈ 6.0%
  5. Bristol

    1. ★ Dark Eyes / P116-C7
      #3e4b51
      ΔE = 1.231 / LRV ≈ 6.7%
    2. Mid Summer Night / P231-N7
      #4f5252
      ΔE = 4.591 / LRV ≈ 8.3%
  6. Dutch Boy

    1. ★ Rabelais' Song
      #434f54
      ΔE = 1.308 / LRV ≈ 7.4%
  7. Marston & Langinger

    1. ★ Greyfriars
      #454c4f
      ΔE = 1.401 / LRV ≈ 7.0%
    2. Smoke Blue
      #3a4449
      ΔE = 3.474 / LRV ≈ 5.5%
  8. Cloverdale Paint

    1. ★ Puerto Deseado / 7381
      #464f53
      ΔE = 1.472 / LRV ≈ 7.5%
    2. In The Dark / 8245
      #4b4c4f
      ΔE = 3.358 / LRV ≈ 7.2%
  9. Humbrol

    1. ★ 32 Dark Grey
      #464e51
      ΔE = 1.557 / LRV ≈ 7.3%
  10. British Standard

    1. ★ BS 2660 BS 9-098 - Blue grey
      #3f484d
      ΔE = 1.681 / LRV ≈ 6.2%
    2. ★ BS 4800 18 B 27 - Grey
      #404a4c
      ΔE = 1.994 / LRV ≈ 6.5%
  11. Glidden

    1. ★ Obsidian / PPG1035-7
      #445055
      ΔE = 1.689 / LRV ≈ 7.6%
    2. Mountain Pine / PPG1034-7
      #3b5257
      ΔE = 4.380 / LRV ≈ 7.7%
  12. Sigma

    1. ★ Cool Blue / S 8005-R80B
      #40484d
      ΔE = 1.708 / LRV ≈ 6.3%
    2. Cool Blue / S 8010-B10G
      #344345
      ΔE = 5.143 / LRV ≈ 5.2%
  13. Resene

    1. ★ Atomic B42-016-232
      #3d4b52
      ΔE = 1.709 / LRV ≈ 6.6%
    2. Tuna N39-008-260
      #46494e
      ΔE = 2.626 / LRV ≈ 6.6%
  14. Behr

    1. ★ Evening Storm PPF-48
      #424d55
      ΔE = 1.709 / LRV ≈ 7.1%
    2. Cracked Pepper PPU18-01
      #4f5152
      ΔE = 4.260 / LRV ≈ 8.2%
  15. Sico

    1. ★ 6170-73 Industrial Blue
      #414b53
      ΔE = 1.730 / LRV ≈ 6.8%
    2. 6169-73 Flanders Lake
      #445258
      ΔE = 2.630 / LRV ≈ 8.0%
  16. Earthpaint

    1. ★ 5-32-7 Blue Gate
      #455054
      ΔE = 1.758 / LRV ≈ 7.6%
    2. ★ 5-34-7 Night Shade
      #434f57
      ΔE = 2.069 / LRV ≈ 7.5%
  17. Sikkens

    1. ★ S0.05.25
      #474d50
      ΔE = 1.768 / LRV ≈ 7.2%
    2. ★ T7.05.25 (RAL 7024)
      #45494e
      ΔE = 2.288 / LRV ≈ 6.6%
  18. Vallejo

    1. ★ Vallejo 70.863 #189
      #464b50
      ΔE = 1.774 / LRV ≈ 6.9%
    2. Vallejo 70.869 #162
      #484b4a
      ΔE = 4.011 / LRV ≈ 6.9%
  19. GM / General Motors

    1. ★ Shadow Gray
      #434c54
      ΔE = 1.798 / LRV ≈ 7.0%
    2. Medium Sea Green
      #344a53
      ΔE = 4.302 / LRV ≈ 6.3%
  20. Federal Standard

    1. ★ Federal Standard 35042
      #454a4e
      ΔE = 1.805 / LRV ≈ 6.7%
    2. Federal Standard 26044
      #3e444b
      ΔE = 3.666 / LRV ≈ 5.7%
  21. Olympic

    1. ★ Midnight Hour D56-6
      #3c494f
      ΔE = 1.839 / LRV ≈ 6.3%
    2. Black Flame D46-6
      #474c59
      ΔE = 5.043 / LRV ≈ 7.2%
  22. Mylands of London

    1. ★ Laurel
      #404b4d
      ΔE = 1.941 / LRV ≈ 6.7%
    2. Dark Grey
      #494c53
      ΔE = 3.016 / LRV ≈ 7.2%
  23. Volkswagen

    1. ★ Jupiter Gray
      #484d52
      ΔE = 1.967 / LRV ≈ 7.3%
    2. Cirrus Gray
      #475659
      ΔE = 4.374 / LRV ≈ 8.7%
  24. Pantone / PMS

    1. ★ 432
      #424a52
      ΔE = 2.048 / LRV ≈ 6.7%
    2. 7546
      #3d4d59
      ΔE = 3.994 / LRV ≈ 7.0%
  25. Dupont

    1. ★ CAS935
      #40484f
      ΔE = 2.091 / LRV ≈ 6.3%
    2. CAS887
      #3b4949
      ΔE = 3.867 / LRV ≈ 6.2%
  26. Steel Primer Paste (Dtm)

    1. ★ Ral Telegrau 1 Mat / 7045
      #44494c
      ΔE = 2.111 / LRV ≈ 6.5%
  27. Crown Diamond

    1. ★ 7355-73 Bowler Hat
      #474d54
      ΔE = 2.132 / LRV ≈ 7.3%
    2. 7324-63 Delft Tile
      #495560
      ΔE = 5.015 / LRV ≈ 8.8%
  28. Devoe Paint

    1. ★ Gabled Blue / 70BG 07/086
      #3d4d51
      ΔE = 2.159 / LRV ≈ 6.9%
    2. Krimson Lake / 90BG 08/075
      #475257
      ΔE = 2.505 / LRV ≈ 8.1%
  29. RAL

    1. ★ RAL 7024 / Graphite Grey
      #45494e
      ΔE = 2.288 / LRV ≈ 6.6%
    2. RAL 7015 / Slate Grey
      #4f5358
      ΔE = 4.098 / LRV ≈ 8.6%
  30. Sherwin-Williams

    1. Sea Serpent - 7615
      #3e4b54
      ΔE = 2.341 / LRV ≈ 6.7%
    2. Perle Noir - 9154
      #4f4d51
      ΔE = 4.722 / LRV ≈ 7.6%
  31. Dulux

    1. 42BB 09/032
      #494d52
      ΔE = 2.343 / LRV ≈ 7.3%
    2. Charcoal Drift / 30BB 10/019
      #4d4f52
      ΔE = 3.471 / LRV ≈ 7.8%
  32. Ford

    1. Bonnie Gray
      #3e4c4e
      ΔE = 2.421 / LRV ≈ 6.7%
    2. Medium Opal
      #3c4752
      ΔE = 3.923 / LRV ≈ 6.1%
  33. Lascaux

    1. Mars­ black / 182
      #42474b
      ΔE = 2.483 / LRV ≈ 6.2%
  34. Games Workshop - Citadel

    1. Eshin Grey
      #4a4f52
      ΔE = 2.514 / LRV ≈ 7.7%
    2. Mechanicus Standard Grey
      #3d4b4d
      ΔE = 2.534 / LRV ≈ 6.6%
  35. Dulux Australia

    1. Colorbond® Ironstone / O2
      #494d53
      ΔE = 2.516 / LRV ≈ 7.3%
    2. Deep Ocean / C24
      #3c4955
      ΔE = 4.074 / LRV ≈ 6.4%
  36. California Paints

    1. DE 5776 - Lunar Eclipse
      #415053
      ΔE = 2.518 / LRV ≈ 7.5%
    2. DE 6336 - Stargazing
      #414549
      ΔE = 3.307 / LRV ≈ 5.9%
  37. Tamiya

    1. Tamiya 80363,XF63
      #3e484a
      ΔE = 2.528 / LRV ≈ 6.2%
    2. Tamiya 80010,X10
      #505558
      ΔE = 4.605 / LRV ≈ 8.9%
  38. Chrysler

    1. Pastorale Green
      #3a4a52
      ΔE = 2.635 / LRV ≈ 6.4%
    2. Dodge Gunmetal
      #4a4a4a
      ΔE = 4.166 / LRV ≈ 6.8%
  39. Magnolia Home

    1. Arches / JG-97
      #40464b
      ΔE = 2.664 / LRV ≈ 6.0%
    2. Fine Black / JG-144
      #48474c
      ΔE = 4.308 / LRV ≈ 6.4%
  40. Audi

    1. Grau Pearl / 9966, LZ7N
      #44484a
      ΔE = 2.779 / LRV ≈ 6.4%
    2. Aventurine Blue Pearl / 7Y7Y, LX5S
      #3f454e
      ΔE = 3.877 / LRV ≈ 5.9%
  41. Tollens

    1. T2020-2
      #434e58
      ΔE = 2.888 / LRV ≈ 7.3%
    2. Bleu graphite | EE118
      #3b4852
      ΔE = 3.344 / LRV ≈ 6.2%
  42. Alcro

    1. Grafit
      #494d4e
      ΔE = 2.939 / LRV ≈ 7.3%
    2. Sotare
      #434a54
      ΔE = 3.199 / LRV ≈ 6.7%
  43. Colortrend

    1. Vermont Slate
      #495259
      ΔE = 2.970 / LRV ≈ 8.2%
    2. 0473
      #3c5052
      ΔE = 4.005 / LRV ≈ 7.3%
  44. Australian Standard AS2700

    1. N65 Graphite Grey
      #44474a
      ΔE = 3.016 / LRV ≈ 6.2%
    2. N64 Dark Grey
      #4b5258
      ΔE = 3.118 / LRV ≈ 8.2%
  45. PPG Pittsburgh Paints

    1. Authentic Charleston Green Chs-71
      #4b4e50
      ΔE = 3.054 / LRV ≈ 7.5%
    2. St. James 7121-3
      #3b4550
      ΔE = 4.440 / LRV ≈ 5.8%
  46. CIL

    1. Krimson Lake
      #46535a
      ΔE = 3.105 / LRV ≈ 8.2%
    2. Black Mica
      #404244
      ΔE = 4.835 / LRV ≈ 5.4%
  47. Diamond Vogel

    1. Dark River / 0494
      #474c4c
      ΔE = 3.160 / LRV ≈ 7.0%
    2. Octavius / 0522
      #47474b
      ΔE = 3.902 / LRV ≈ 6.4%
  48. Clark+Kensington

    1. Dot Dot Dot / 36A-5
      #3b454c
      ΔE = 3.194 / LRV ≈ 5.7%
    2. Black Chiffon / N-C15
      #4d4f50
      ΔE = 3.779 / LRV ≈ 7.7%
  49. Pratt & Lambert

    1. Witching Hour 30-18
      #414549
      ΔE = 3.307 / LRV ≈ 5.9%
    2. Midsummer Gale 26-17
      #32454f
      ΔE = 5.078 / LRV ≈ 5.5%
  50. Kelly-Moore

    1. In the Dark / KM3784-5
      #48494c
      ΔE = 3.335 / LRV ≈ 6.7%
    2. Zaire / AC240-5
      #344849
      ΔE = 5.053 / LRV ≈ 5.8%
  51. Coronado Paint

    1. 8261 - New Uniform
      #494a4c
      ΔE = 3.399 / LRV ≈ 6.8%
    2. 7381 - Puerto Deseado
      #394247
      ΔE = 4.282 / LRV ≈ 5.2%
  52. Pascol

    1. Colorbond® Deep Ocean PZ1060
      #3c4e58
      ΔE = 3.413 / LRV ≈ 7.1%
    2. Colorbond® Deep Ocean PZ1060
      #3b4d59
      ΔE = 4.210 / LRV ≈ 7.0%
  53. Crown Paint

    1. Penny Black
      #454749
      ΔE = 3.427 / LRV ≈ 6.3%
    2. City Life
      #4a545d
      ΔE = 4.158 / LRV ≈ 8.6%
  54. Colorhouse

    1. Metal .06
      #3f4647
      ΔE = 3.433 / LRV ≈ 5.9%
  55. Toyo Ink

    1. CF11005
      #48545b
      ΔE = 3.509 / LRV ≈ 8.5%
    2. CF11008
      #454d58
      ΔE = 3.603 / LRV ≈ 7.3%
  56. Wattyl

    1. Midnight Seas / E40W
      #384750
      ΔE = 3.511 / LRV ≈ 5.9%
    2. Grey Ember / A39W
      #4a4a4c
      ΔE = 3.780 / LRV ≈ 6.9%
  57. Ralph Lauren

    1. Artist Grey / RLUL219
      #42454a
      ΔE = 3.516 / LRV ≈ 5.9%
    2. Reflecting Pool / RLVM271
      #3e5259
      ΔE = 3.661 / LRV ≈ 7.8%
  58. Brighto Paints

    1. 5-38-7 Eclipse
      #3f4751
      ΔE = 3.552 / LRV ≈ 6.2%
    2. 5-39-7 Persian Blue
      #464850
      ΔE = 3.731 / LRV ≈ 6.5%
  59. Natural Color System / NCS

    1. S 7005-B20G
      #424647
      ΔE = 3.588 / LRV ≈ 6.0%
    2. S 6010-R90B
      #4b515b
      ΔE = 4.214 / LRV ≈ 8.1%
  60. ICI Paints

    1. Light's Out 50BG 08/021
      #424647
      ΔE = 3.588 / LRV ≈ 6.0%
    2. Mary Janes 30BB 07/041
      #3f4349
      ΔE = 4.103 / LRV ≈ 5.6%
  61. General Paint

    1. Tension / CL 3057N
      #445355
      ΔE = 3.603 / LRV ≈ 8.1%
    2. Witching Hour / CL 3187N
      #4f4e4f
      ΔE = 4.665 / LRV ≈ 7.7%
  62. Nippon Paint

    1. Bedrock Bottom / NP N 1981 A
      #4d4e52
      ΔE = 3.624 / LRV ≈ 7.6%
    2. Flint Black / NP N 2009 A
      #3c4544
      ΔE = 4.734 / LRV ≈ 5.6%
  63. Duron

    1. Cyberspace
      #404751
      ΔE = 3.643 / LRV ≈ 6.2%
    2. Rock Bottom
      #444847
      ΔE = 4.103 / LRV ≈ 6.3%
  64. New Look

    1. Turbo Charged / A04-09
      #4a4a4c
      ΔE = 3.780 / LRV ≈ 6.9%
  65. Caparol

    1. 33/18
      #384448
      ΔE = 3.796 / LRV ≈ 5.4%
    2. 25/20
      #404444
      ΔE = 4.545 / LRV ≈ 5.6%
  66. Benjamin Moore

    1. Nightfall / 1596
      #4c4f4f
      ΔE = 3.881 / LRV ≈ 7.7%
    2. Deep Indigo / 1442
      #4a494d
      ΔE = 4.101 / LRV ≈ 6.8%
  67. Tikkurila

    1. X489 / Anthracite
      #45464c
      ΔE = 3.902 / LRV ≈ 6.2%
  68. Crayola

    1. Slate
      #404e5a
      ΔE = 3.916 / LRV ≈ 7.3%
  69. Flügger

    1. Dyb Fjord (U-794)
      #3e4349
      ΔE = 3.985 / LRV ≈ 5.5%
    2. Midnat (U-753)
      #464851
      ΔE = 4.060 / LRV ≈ 6.5%
  70. 1829

    1. Jet Black
      #444548
      ΔE = 4.022 / LRV ≈ 6.0%
    2. Lido Blue
      #444752
      ΔE = 4.714 / LRV ≈ 6.3%
  71. Albany Paint

    1. Steamer
      #4d545b
      ΔE = 4.074 / LRV ≈ 8.7%
  72. Brillux

    1. 69.06.27
      #43555a
      ΔE = 4.117 / LRV ≈ 8.4%
    2. 69.03.27
      #4e565b
      ΔE = 4.476 / LRV ≈ 9.0%
  73. Sto

    1. 34442
      #484d58
      ΔE = 4.142 / LRV ≈ 7.4%
    2. 35242
      #42505d
      ΔE = 4.638 / LRV ≈ 7.7%
  74. Nerolac

    1. Lights Off - 3001
      #41454e
      ΔE = 4.159 / LRV ≈ 5.9%
    2. Bold Green - 4325
      #394f51
      ΔE = 4.474 / LRV ≈ 7.1%
  75. Berger

    1. New Uniform / 8261
      #49484c
      ΔE = 4.164 / LRV ≈ 6.6%
  76. Scib Paints

    1. New Uniform / 8261
      #49484c
      ΔE = 4.164 / LRV ≈ 6.6%
  77. Vista Paint

    1. New Uniform
      #49484c
      ΔE = 4.164 / LRV ≈ 6.6%
  78. Nature Paint

    1. Chough
      #4f5355
      ΔE = 4.196 / LRV ≈ 8.5%
  79. AMC

    1. Medium Gloss Black
      #464648
      ΔE = 4.200 / LRV ≈ 6.2%
    2. Charcoal Gray
      #525354
      ΔE = 5.104 / LRV ≈ 8.6%
  80. Beckers

    1. Åska 517 / S 7000-N
      #4c4c4c
      ΔE = 4.219 / LRV ≈ 7.2%
    2. Aska 518 / 6901-B85G
      #4e504f
      ΔE = 4.741 / LRV ≈ 7.9%
  81. KILZ

    1. Toasted Poppyseed / G891
      #4a4c4b
      ΔE = 4.232 / LRV ≈ 7.1%
    2. Caviar Dream / H891
      #4d5656
      ΔE = 5.084 / LRV ≈ 8.9%
  82. Dunn-Edwards

    1. Slate Wall / 112
      #40535d
      ΔE = 4.318 / LRV ≈ 8.1%
    2. Cavernous / 188
      #515252
      ΔE = 5.035 / LRV ≈ 8.4%
  83. Valspar Paint

    1. Corduroy Black
      #4d5059
      ΔE = 4.347 / LRV ≈ 8.0%
    2. Everglade Deck
      #40555a
      ΔE = 4.596 / LRV ≈ 8.3%
  84. Peintures MF

    1. Tornade
      #404444
      ΔE = 4.545 / LRV ≈ 5.6%
    2. Yorkshire
      #354651
      ΔE = 4.726 / LRV ≈ 5.7%
  85. Borgward

    1. Silbergrau / 76
      #484b49
      ΔE = 4.590 / LRV ≈ 6.9%
  86. Levis

    1. Clear Grey B70
      #505354
      ΔE = 4.607 / LRV ≈ 8.5%
    2. Staalblauw
      #3b424c
      ΔE = 5.100 / LRV ≈ 5.3%
  87. Rodda Paint

    1. Winter Balsam H99
      #35494a
      ΔE = 4.837 / LRV ≈ 6.0%
    2. Asher Benjamin H63
      #45575e
      ΔE = 4.857 / LRV ≈ 8.9%
  88. Opaltone / OMS

    1. 6962
      #404b59
      ΔE = 4.936 / LRV ≈ 6.8%
  89. McCormick Paints

    1. 227 Williamsburg
      #364848
      ΔE = 4.945 / LRV ≈ 5.9%
  90. Teknos

    1. PR550
      #4e4c4c
      ΔE = 5.147 / LRV ≈ 7.3%

#424c51 HTML & CSS Przykłady

#424c51 pierwszoplanowy

Gdyby kózka nie skakała, to by nóżki nie złamała.

<p style="color: #424c51">…</p>

#424c51 tło

Mądry Polak po szkodzie.

<p style="background-color: #424c51">…</p>

#424c51 cień tekstu

Co nagle, to po diable.

<p style="text-shadow: 0.1em 0.1em 0.15em #424c51">…</p>

Wykresy Kompozycji

Przestrzenie kolorów

Dziesiątkowy
4344913
Dwójkowy
01000010, 01001100, 01010001
Hexadecimal
#424c51
LRV
≈ 6.9%
Najbliższy krótki kolor szesnastkowy
#455 ΔE = 4.959
RGB
rgb(66, 76, 81)
RGBA
rgba(66, 76, 81, 1.0)
rg chromatyczności
r: 0.296, g: 0.341, b: 0.363
RYB
czerwony: 25.882%, żółty: 28.235%, niebieski: 31.765%
Android / android.graphics.Color
-12432303 / 0xff424c51
HSL
hsl(200, 10%, 29%)
HSLA
hsla(200, 10%, 29%, 1.0)
HSV / HSB
barwa: 200° (200.000), nasycenie: 19% (0.185), wartość: 32% (0.318)
HSP
barwa: 200.000, nasycenie: 18.519%, postrzegana jasność: 28.926%
HSLuv (HUSL)
H: 223.212, S: 23.300, L: 31.627
Cubehelix
H: -166.073, S: 0.104, L: 0.288
TSL
T: -1.907, S: 0.051, L: 0.289
CMYK
cyjan: 19% (0.185), magenta: 6% (0.062), żółty: 0% (0.000), czarna: 68% (0.682)
CMY
cyjan: 74% (0.741), magenta: 70% (0.702), żółty: 68% (0.682)
XYZ
X: 6.316, Y: 6.921, Z: 8.786
xyY
x: 0.287, y: 0.314, Y: 6.921
CIELab
L: 31.627, a: -2.765, b: -4.311
CIELuv
L: 31.627, u: -5.239, v: -4.921
CIELCH / LCHab
L: 31.627, C: 5.121, H: 237.325
CIELUV / LCHuv
L: 31.627, C: 7.188, H: 223.212
Hunter-Lab
L: 26.308, a: -3.184, b: -1.386
CIECAM02
J: 22.918, C: 9.817, h: 226.714, Q: 94.319, M: 8.585, s: 30.169, H: 287.390
OSA-UCS
lekkość: -10.108, żółty: -0.768, zielony: 0.734
LMS
L: 6.175, M: 7.358, S: 8.753
YCbCr
Y: 79.204, Cb: 131.675, Cr: 123.255
YCoCg
Y: 74.750, Cg: 1.250, Co: 12.750
YDbDr
Y: 73.580, Db: 11.165, Dr: 14.415
YPbPr
Y: 74.230, Pb: 3.650, Pr: -5.230
xvYCC
Y: 79.750, Cb: 131.206, Cr: 123.406
YIQ
Y: 73.580, I: -7.563, Q: -0.559
YUV
Y: 73.580, U: 3.652, V: -6.650
System Koloru Munsell
5B 3/1 ΔE = 2.033
Kolor marki
WordPress (grey) ΔE = 5.463

Przypadkowe Kolory

Czerwony

Zielony

Niebieski