Encycolorpedia

Tikkurila X351 / #a8c1e1 Barwy Hex

#a8c1e1 Paint ChipSzesnastkowykod kolour #a8c1e1 jest jasny odcieniem cyjan-niebiesko. W kolorze RGB model #a8c1e1 składa się z 65.88% czerwonego, 75.69% zielonego i 88.24% niebieskiego. W kolorze HSL przestrzeń #a8c1e1 ma odcień 214° (stopni), 49% nasycenie i 77% jasność. Kolor ten ma przybliżoną długość fali 478.44 nm.

Odmiany Kolorów

Nazwane Kolory

Schematy Kolorów

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

#a8c1e1 gradient liniowy do kompemetnarnego #d9cab0

  1. #a8c1e1
  2. #b2c2d9
  3. #bbc4d1
  4. #c3c5c9
  5. #cbc7c0
  6. #d2c8b8
  7. #d9cab0

Kolory monochromatyczne

  1. #849dbb
  2. #90a9c8
  3. #9cb5d4
  4. #a8c1e1
  5. #b4cdee
  6. #c1dafb
  7. #cee7ff

Odcienie kolorów

#a8c1e1 do białego

  1. #a8c1e1
  2. #b7cbe6
  3. #c5d5eb
  4. #d4e0f0
  5. #e2eaf5
  6. #f1f4fa
  7. #ffffff / #fff

#a8c1e1 do czarnego

  1. #a8c1e1
  2. #8a9eb8
  3. #6d7c90
  4. #515c6a
  5. #373e46
  6. #1f2226
  7. #000000 / #000

Farba

Dopasowywanie farb

Podobne farby

  1. Valspar Paint

    1. ★ July Sky
      #a6c1e1
      ΔE = 0.488 / LRV ≈ 51.7%
    2. Brush Stroke R170D
      #b3c5e1
      ΔE = 2.503 / LRV ≈ 55.0%
  2. Resene

    1. ★ Time Out B82-036-253
      #aac2e3
      ΔE = 0.654 / LRV ≈ 52.7%
    2. Spindle B82-022-246
      #b3c4d8
      ΔE = 3.934 / LRV ≈ 54.0%
  3. Pantone / PMS

    1. ★ 2717 CP
      #a9c0de
      ΔE = 0.709 / LRV ≈ 51.4%
    2. 651 U
      #afc3db
      ΔE = 2.603 / LRV ≈ 53.3%
  4. Coronado Paint

    1. ★ 7249 - Morning Sky
      #a4c1e2
      ΔE = 0.889 / LRV ≈ 51.5%
    2. 7273 - Scuba Blue
      #a0bdda
      ΔE = 2.420 / LRV ≈ 48.9%
  5. Benjamin Moore

    1. ★ Swiss Blue / 815
      #a4c2e4
      ΔE = 1.092 / LRV ≈ 52.1%
    2. Sunrise / 829
      #a6b8ce
      ΔE = 4.363 / LRV ≈ 46.8%
  6. Nerolac

    1. ★ Always Blue - 2374
      #a3c1e3
      ΔE = 1.120 / LRV ≈ 51.5%
    2. Lighted Moonstone - 4259
      #a3c6e2
      ΔE = 3.316 / LRV ≈ 53.7%
  7. Sikkens

    1. ★ U0.15.69
      #acc0de
      ΔE = 1.142 / LRV ≈ 51.7%
    2. U4.10.72
      #bac3db
      ΔE = 4.303 / LRV ≈ 54.6%
  8. Caparol

    1. ★ 85 6 243 / Neutral Blau 1
      #acc4e4
      ΔE = 1.177 / LRV ≈ 53.9%
    2. 43/06
      #a8c0e8
      ΔE = 2.699 / LRV ≈ 51.8%
  9. Olympic

    1. ★ Vivacious Violet A46-3
      #a6bee0
      ΔE = 1.252 / LRV ≈ 50.3%
    2. Valor A51-3
      #9fbfd8
      ΔE = 3.684 / LRV ≈ 49.6%
  10. Albany Paint

    1. ★ Bluebird
      #aac4e2
      ΔE = 1.256 / LRV ≈ 53.5%
    2. China Blue
      #aebfd3
      ΔE = 3.742 / LRV ≈ 51.0%
  11. Zoffany

    1. ★ Porcelain
      #aec3e0
      ΔE = 1.421 / LRV ≈ 53.4%
  12. Duron

    1. ★ Blue Beyond
      #a2c0e4
      ΔE = 1.498 / LRV ≈ 51.0%
    2. Respite
      #99b8d5
      ΔE = 4.256 / LRV ≈ 45.9%
  13. Vista Paint

    1. ★ Scuba Blue
      #a7bdde
      ΔE = 1.527 / LRV ≈ 49.9%
    2. Blissful Blue
      #a4bfd9
      ΔE = 2.478 / LRV ≈ 50.2%
  14. Glidden

    1. ★ Aristocratic Blue / 10BB 50/177
      #a3bedc
      ΔE = 1.590 / LRV ≈ 49.8%
    2. Spring Bluebell / 48BB 56/162
      #bac5e4
      ΔE = 4.127 / LRV ≈ 56.0%
  15. Asian Paints

    1. ★ Morning Sky / 7249
      #abc0e3
      ΔE = 1.599 / LRV ≈ 51.9%
    2. Serene Blue / 9154
      #bbc9e5
      ΔE = 4.364 / LRV ≈ 58.0%
  16. Taubmans

    1. ★ Vivacious Violet / T10 38B-1
      #a9bddc
      ΔE = 1.612 / LRV ≈ 50.0%
    2. Festival Sky / T08 26-3
      #a0bdd8
      ΔE = 2.905 / LRV ≈ 48.8%
  17. Behr

    1. ★ Skysail Blue 580D-4
      #a8c0db
      ΔE = 1.647 / LRV ≈ 51.1%
    2. Sweet Juliet PPU15-15
      #b7bfd4
      ΔE = 4.564 / LRV ≈ 52.1%
  18. Colortrend

    1. ★ 0595
      #a9bddd
      ΔE = 1.652 / LRV ≈ 50.0%
    2. 0588
      #abbbd4
      ΔE = 3.083 / LRV ≈ 49.0%
  19. Diamond Vogel

    1. ★ Sail into the Horizon / 0595
      #a9bddd
      ΔE = 1.652 / LRV ≈ 50.0%
    2. Babbling Creek / 0588
      #abbbd4
      ΔE = 3.083 / LRV ≈ 49.0%
  20. Laura Ashley

    1. ★ 1503 Sapphire 3
      #a6beda
      ΔE = 1.688 / LRV ≈ 50.0%
    2. 1403 Chambray 3
      #99bbd4
      ΔE = 4.802 / LRV ≈ 47.1%
  21. ICI Paints

    1. ★ 4183 Dusky Lilac 48BB 56/162
      #aec1dc
      ΔE = 1.760 / LRV ≈ 52.3%
    2. ★ Dusky Lilac 48BB 56/162
      #afc2db
      ΔE = 2.291 / LRV ≈ 52.8%
  22. Focoltone

    1. ★ 1049
      #a2c3e7
      ΔE = 1.819 / LRV ≈ 52.5%
  23. Earthpaint

    1. ★ 1-37-3 Blue Lupine
      #a2bcdc
      ΔE = 1.899 / LRV ≈ 48.8%
    2. 1-36-3 Queenscliff
      #9dbfde
      ΔE = 2.590 / LRV ≈ 49.7%
  24. Clark+Kensington

    1. ★ Under the Sea / KIDCC-45
      #abbee0
      ΔE = 1.903 / LRV ≈ 50.9%
    2. Good News / 38C-4
      #acbcd3
      ΔE = 3.294 / LRV ≈ 49.4%
  25. General Paint

    1. ★ Ice Wine / CL 2352W
      #aec5e1
      ΔE = 1.923 / LRV ≈ 54.4%
    2. Labyrinth / CL 2362W
      #b0bfd1
      ΔE = 4.372 / LRV ≈ 51.1%
  26. Bristol

    1. ★ Blue Purple / P111-C3
      #a1c0de
      ΔE = 1.950 / LRV ≈ 50.5%
    2. Lilac Silk / P107-C3
      #acb9d0
      ΔE = 4.081 / LRV ≈ 48.0%
  27. Evonik-Degussa

    1. ★ 7201P Lilac Frost
      #aec3dd
      ΔE = 2.029 / LRV ≈ 53.2%
    2. 7191P Faded Violet
      #b5bfd7
      ΔE = 3.770 / LRV ≈ 52.0%
  28. CIL

    1. ★ Roslyn's Blue
      #acbddd
      ΔE = 2.158 / LRV ≈ 50.4%
    2. Aristocratic
      #a0bfd8
      ΔE = 3.494 / LRV ≈ 49.7%
  29. Berger

    1. ★ Morning Sky / 7249
      #acc1e6
      ΔE = 2.191 / LRV ≈ 52.6%
    2. Violet Vista / 7226
      #babed7
      ΔE = 5.161 / LRV ≈ 52.2%
  30. Scib Paints

    1. ★ Morning Sky / 7249
      #acc1e6
      ΔE = 2.191 / LRV ≈ 52.6%
    2. Blue Sky / 7329
      #8ec1e9
      ΔE = 5.239 / LRV ≈ 49.8%
  31. Jotun

    1. ★ 4165 / Spa
      #a6c4e0
      ΔE = 2.226 / LRV ≈ 53.0%
  32. AMC

    1. ★ Diamond Blue
      #9fc3e6
      ΔE = 2.290 / LRV ≈ 52.1%
    2. Wedgewood Blue
      #9fb8d2
      ΔE = 3.984 / LRV ≈ 46.3%
  33. Tollens

    1. T2011-6
      #a7bbd7
      ΔE = 2.412 / LRV ≈ 48.7%
    2. T2008-1
      #abb9d7
      ΔE = 3.396 / LRV ≈ 48.3%
  34. McCormick Paints

    1. Blissful Blue
      #a4bfd9
      ΔE = 2.478 / LRV ≈ 50.2%
  35. Plascon

    1. Let it Rain B4-C2-3
      #b0c8e8
      ΔE = 2.610 / LRV ≈ 56.4%
    2. Dreamcatcher B4-B2-2
      #98bce8
      ΔE = 4.375 / LRV ≈ 48.5%
  36. New Look

    1. Believe in Miracles / E22-02
      #9fc3e2
      ΔE = 2.674 / LRV ≈ 51.9%
    2. Precious Orchid / F30-08
      #b3c1d9
      ΔE = 3.060 / LRV ≈ 52.7%
  37. Wattyl

    1. Dream Space / E22W
      #9fc3e2
      ΔE = 2.674 / LRV ≈ 51.9%
    2. Sky Blume / D77W
      #b3c1d9
      ΔE = 3.060 / LRV ≈ 52.7%
  38. Habitat

    1. Sky
      #9dc1e0
      ΔE = 2.765 / LRV ≈ 50.7%
  39. Federal Standard

    1. Federal Standard 25488
      #a2bfd9
      ΔE = 2.814 / LRV ≈ 50.0%
    2. Federal Standard 35488
      #a1bbd1
      ΔE = 4.327 / LRV ≈ 47.7%
  40. Crown Diamond

    1. 7353-31 Morning Smile
      #a4b9d8
      ΔE = 2.826 / LRV ≈ 47.5%
    2. 7327-31 Jasper Blue
      #98b9da
      ΔE = 3.808 / LRV ≈ 46.4%
  41. California Paints

    1. DE 5877 - Afternoon Sky
      #b0c6df
      ΔE = 2.832 / LRV ≈ 54.9%
    2. DE 5898 - Prim Blue
      #b9c4de
      ΔE = 3.860 / LRV ≈ 55.1%
  42. Dunn-Edwards

    1. Afternoon Sky / 1092
      #b0c6df
      ΔE = 2.832 / LRV ≈ 54.9%
    2. Prim Blue / 1221
      #b9c4de
      ΔE = 3.860 / LRV ≈ 55.1%
  43. Brighto Paints

    1. 2-37-3 Northern Sky
      #afc9e8
      ΔE = 2.848 / LRV ≈ 56.7%
    2. 1-38-3 Panache
      #b3c8ec
      ΔE = 3.438 / LRV ≈ 56.9%
  44. Devoe Paint

    1. Roslyn's Blue / 49BB 51/186
      #aebdd6
      ΔE = 2.850 / LRV ≈ 50.2%
    2. Virtuoso / 30BB 47/179
      #a2b7cc
      ΔE = 5.031 / LRV ≈ 45.9%
  45. Nippon Paint

    1. Blue Aura / NP PB 1529 P
      #adc5dd
      ΔE = 2.922 / LRV ≈ 54.0%
    2. Blue Rhythm / NP PB 1528 P
      #99c1e4
      ΔE = 3.198 / LRV ≈ 50.5%
  46. Cloverdale Paint

    1. Scuba Blue / 7273
      #acc6df
      ΔE = 2.931 / LRV ≈ 54.5%
    2. Violet Vista / 7226
      #bac3d8
      ΔE = 4.631 / LRV ≈ 54.4%
  47. Diamond Paint

    1. Sunrise
      #adbdd4
      ΔE = 3.151 / LRV ≈ 50.0%
  48. Flügger

    1. Klassicisme: Berlinerblå (No.14)
      #b6c6e1
      ΔE = 3.186 / LRV ≈ 55.8%
  49. Ford

    1. Biltmore Blue
      #a2c5e1
      ΔE = 3.216 / LRV ≈ 53.0%
    2. Wind Blue
      #96c4e8
      ΔE = 4.221 / LRV ≈ 51.8%
  50. TRUMATCH

    1. 32-e2
      #9ec1dd
      ΔE = 3.216 / LRV ≈ 50.6%
    2. 31-e2
      #9ec4df
      ΔE = 4.019 / LRV ≈ 52.1%
  51. Chrysler

    1. Powder Blue
      #abc2d8
      ΔE = 3.228 / LRV ≈ 52.2%
    2. Hawaiian Blue
      #a3bdd3
      ΔE = 3.948 / LRV ≈ 48.9%
  52. Tikkurila

    1. H351
      #b3cae8
      ΔE = 3.400 / LRV ≈ 57.6%
    2. V355
      #97b8d2
      ΔE = 5.143 / LRV ≈ 45.5%
  53. RAL

    1. RAL 270 80 15
      #b6c7e0
      ΔE = 3.489 / LRV ≈ 56.2%
    2. RAL 260 80 15
      #b1c9df
      ΔE = 4.270 / LRV ≈ 56.4%
  54. Dulux Australia

    1. Breezy / A375
      #aecbea
      ΔE = 3.519 / LRV ≈ 57.6%
    2. Mist / G81
      #b7c2d4
      ΔE = 4.744 / LRV ≈ 53.4%
  55. Dutch Boy

    1. Blue Blankie
      #aac9e4
      ΔE = 3.542 / LRV ≈ 55.9%
    2. Faded Hydrangea
      #b4bdd1
      ΔE = 4.581 / LRV ≈ 50.7%
  56. Crown Paint

    1. Blue Light
      #b2c8e0
      ΔE = 3.546 / LRV ≈ 56.2%
    2. Lupin
      #a0b8de
      ΔE = 3.706 / LRV ≈ 47.0%
  57. GM / General Motors

    1. Firemist Blue
      #abb9d3
      ΔE = 3.583 / LRV ≈ 48.1%
    2. Venetian Blue
      #9bb7d7
      ΔE = 3.904 / LRV ≈ 45.7%
  58. Jedynka

    1. Azúrkék Ég
      #9bbdd9
      ΔE = 3.614 / LRV ≈ 48.4%
    2. Pd 1215
      #b8cde6
      ΔE = 4.918 / LRV ≈ 59.6%
  59. Martha Stewart Living

    1. Lilac B15
      #b6c7df
      ΔE = 3.630 / LRV ≈ 56.1%
    2. Wisteria B13
      #b2c0d2
      ΔE = 4.397 / LRV ≈ 51.8%
  60. Sigma

    1. Cool Blue / S 2020-R80B
      #a5bdd3
      ΔE = 3.694 / LRV ≈ 49.1%
    2. Cool Blue / S 1040-R80B
      #98c2ee
      ΔE = 4.264 / LRV ≈ 51.4%
  61. Rodda Paint

    1. Berry Blush 7217
      #b8c6e6
      ΔE = 3.709 / LRV ≈ 56.3%
    2. Violet Vista 7226
      #bac3d8
      ΔE = 4.631 / LRV ≈ 54.4%
  62. Volkswagen

    1. Smoke Silver Blue
      #9bc3e1
      ΔE = 3.736 / LRV ≈ 51.4%
  63. Games Workshop - Citadel

    1. Etherium Blue / Blue Horror
      #a2bad2
      ΔE = 3.750 / LRV ≈ 47.5%
  64. KILZ

    1. Baby Boots / B871
      #b1cae3
      ΔE = 3.881 / LRV ≈ 57.1%
    2. Soft Chambray / C812
      #a6c3d7
      ΔE = 4.651 / LRV ≈ 52.0%
  65. Caran d'Ache

    1. 661 Light Cobalt Blue
      #a1c9e9
      ΔE = 3.916 / LRV ≈ 55.2%
  66. Natural Color System / NCS

    1. S 1515-R80B
      #b5c1d6
      ΔE = 3.920 / LRV ≈ 52.8%
    2. S 1020-R80B
      #b9cae4
      ΔE = 4.253 / LRV ≈ 58.2%
  67. Disney

    1. 3A-30-2 Eeyore
      #abbcd0
      ΔE = 4.037 / LRV ≈ 49.2%
    2. 3A-10-2 Moonlight Waltz
      #a5b4d3
      ΔE = 4.742 / LRV ≈ 45.3%
  68. Pratt & Lambert

    1. Cool Whisper 27-27
      #a2b9d0
      ΔE = 4.170 / LRV ≈ 46.9%
    2. Hoarfrost 28-3
      #bdc9e0
      ΔE = 4.992 / LRV ≈ 58.0%
  69. Peintures MF

    1. DD414-1
      #aab8cf
      ΔE = 4.232 / LRV ≈ 47.3%
    2. CD346-2
      #adb6ce
      ΔE = 5.070 / LRV ≈ 46.8%
  70. Toyo Ink

    1. CF10426
      #99b7d5
      ΔE = 4.310 / LRV ≈ 45.4%
    2. CF10423
      #a6c6dc
      ΔE = 4.559 / LRV ≈ 53.7%
  71. Sherwin-Williams

    1. Agapanthus - 9066
      #bbc5de
      ΔE = 4.330 / LRV ≈ 55.8%
    2. Blue Beyond - 6961
      #91b8d9
      ΔE = 5.106 / LRV ≈ 45.3%
  72. Beckers

    1. Skilla 779 / S 1515-B20G
      #b8c0d7
      ΔE = 4.350 / LRV ≈ 52.8%
  73. Earthborn

    1. Dorothy
      #a9cce9
      ΔE = 4.363 / LRV ≈ 57.5%
  74. Kelly-Moore

    1. Make a Splash / KM3140-1
      #a3c7e0
      ΔE = 4.383 / LRV ≈ 54.0%
    2. Violet Vista / KM3083-1
      #babfd6
      ΔE = 5.037 / LRV ≈ 52.6%
  75. Ralph Lauren

    1. Chi / RLVM284
      #b8c4d8
      ΔE = 4.408 / LRV ≈ 54.6%
  76. Brillux

    1. 60.12.12
      #b2c6d9
      ΔE = 4.447 / LRV ≈ 54.9%
    2. 54.12.12
      #bbc7dd
      ΔE = 4.626 / LRV ≈ 56.6%
  77. Porter Paints

    1. Windsor Way / 250-3
      #9ec8e5
      ΔE = 4.586 / LRV ≈ 54.2%
    2. Lilac Sachet / 246-4
      #abb6d8
      ΔE = 4.799 / LRV ≈ 47.1%
  78. Dulux

    1. 30BB 47/161
      #9fb7cf
      ΔE = 4.603 / LRV ≈ 45.7%
    2. 36BB 46/231
      #94b7db
      ΔE = 4.680 / LRV ≈ 45.3%
  79. Opaltone / OMS

    1. 6064
      #9fb4d3
      ΔE = 4.603 / LRV ≈ 44.7%
    2. 5338
      #afbece
      ΔE = 5.019 / LRV ≈ 50.4%
  80. Levis

    1. Subtle Lavender
      #aec0d1
      ΔE = 4.668 / LRV ≈ 51.3%
    2. Clear Blue C20
      #b3cade
      ΔE = 4.980 / LRV ≈ 57.1%
  81. Australian Standard AS2700

    1. B32 Powder Blue
      #b6c8db
      ΔE = 4.813 / LRV ≈ 56.4%
  82. Sto

    1. 34405
      #bacae0
      ΔE = 4.824 / LRV ≈ 58.1%
    2. 35122
      #aabecf
      ΔE = 4.891 / LRV ≈ 49.9%
  83. PPG Pittsburgh Paints

    1. Blue Bows / PPG1158-3
      #a4c3d7
      ΔE = 4.959 / LRV ≈ 51.8%
    2. Twinberry Blossom 247-3
      #bec9e0
      ΔE = 5.169 / LRV ≈ 58.1%
  84. British Standard

    1. BS 4800 20 C 35 - Blue
      #a5b5cc
      ΔE = 4.986 / LRV ≈ 45.4%
  85. Dupont

    1. CAS938
      #b5c9dc
      ΔE = 4.986 / LRV ≈ 56.8%

Symulacja Daltonizmu

Monochromacy

Dichromacy

Trichromacy

#a8c1e1 HTML & CSS Przykłady

#a8c1e1 pierwszoplanowy

Kto pije i pali ten nie ma robali.

<p style="color: #a8c1e1">…</p>

#a8c1e1 tło

Co nagle, to po diable.

<p style="background-color: #a8c1e1">…</p>

#a8c1e1 cień tekstu

Jak cię widzą, tak cię piszą.

<p style="text-shadow: 0.1em 0.1em 0.15em #a8c1e1">…</p>

Wykresy Kompozycji

Przestrzenie kolorów

Dziesiątkowy
11059681
Dwójkowy
10101000, 11000001, 11100001
Hexadecimal
#a8c1e1
LRV
≈ 51.9%
Najbliższy krótki kolor szesnastkowy
#abd ΔE = 2.766
RGB
rgb(168, 193, 225)
RGBA
rgba(168, 193, 225, 1.0)
rg chromatyczności
r: 0.287, g: 0.329, b: 0.384
RYB
czerwony: 65.882%, żółty: 72.697%, niebieski: 88.235%
Android / android.graphics.Color
-5717535 / 0xffa8c1e1
HSL
hsl(214, 49%, 77%)
HSLA
hsla(214, 49%, 77%, 1.0)
HSV / HSB
barwa: 214° (213.684), nasycenie: 25% (0.253), wartość: 88% (0.882)
HSP
barwa: 213.684, nasycenie: 25.333%, postrzegana jasność: 74.484%
HSLuv (HUSL)
H: 243.884, S: 51.815, L: 77.221
Cubehelix
H: -149.387, S: 0.428, L: 0.741
TSL
T: -1.851, S: 0.063, L: 0.742
CMYK
cyjan: 25% (0.253), magenta: 14% (0.142), żółty: 0% (0.000), czarna: 12% (0.118)
CMY
cyjan: 34% (0.341), magenta: 24% (0.243), żółty: 12% (0.118)
XYZ
X: 48.805, Y: 51.899, Z: 78.666
xyY
x: 0.272, y: 0.289, Y: 51.899
CIELab
L: 77.221, a: -1.427, b: -18.736
CIELuv
L: 77.221, u: -14.295, v: -29.158
CIELCH / LCHab
L: 77.221, C: 18.791, H: 265.645
CIELUV / LCHuv
L: 77.221, C: 32.474, H: 243.884
Hunter-Lab
L: 72.041, a: -5.145, b: -14.313
CIECAM02
J: 69.363, C: 26.609, h: 248.284, Q: 164.088, M: 23.269, s: 37.658, H: 305.157
OSA-UCS
lekkość: -10.158, żółty: -3.267, zielony: 1.250
LMS
L: 45.285, M: 54.240, S: 78.212
YCbCr
Y: 178.498, Cb: 145.748, Cr: 114.753
YCoCg
Y: 194.750, Cg: -1.750, Co: 27.750
YDbDr
Y: 189.173, Db: 53.906, Dr: 40.269
YPbPr
Y: 189.979, Pb: 18.875, Pr: -13.972
xvYCC
Y: 179.158, Cb: 144.580, Cr: 115.727
YIQ
Y: 189.173, I: -25.173, Q: 4.670
YUV
Y: 189.173, U: 17.632, V: -18.575
System Koloru Munsell
5PB 7/6 ΔE = 3.130
Kolor marki
Vimeo ΔE = 6.898

Przypadkowe Kolory

Czerwony

Zielony

Niebieski