ʻO 4K, Ultra HD, a i ʻole 2160p kahi hoʻonā hōʻike o 3840 x 2160 mau pikela a i ʻole 8.3 megapixels i ka huina. Me ka nui o nā ʻike 4K e loaʻa ana a me ke emi ʻana o nā kumukūʻai o nā hōʻike 4K, ke hele mālie nei ka hoʻonā 4K akā me ka paʻa i kona ala e pani ai i ka 1080p ma ke ʻano he kūlana hou.

Inā hiki iā ʻoe ke kūʻai i nā lako e pono ai e holo mālie iā 4K, pono maoli ia.

ʻAʻole e like me nā pōkole hoʻonā pale haʻahaʻa e loaʻa ana nā pikela kū pololei i loko o kā lākou lepili, e like me 1080p no 1920 × 1080 Full HD a i ʻole 1440p no 2560 × 1440 Quad HD, ʻo ka hoʻonā 4K e hōʻike ana ma kahi o 4,000 mau pikela ākea ma kahi o ka waiwai kū pololei.

ʻOiai he 2160 mau pikela kū pololei ka 4K a i ʻole Ultra HD, ua kapa ʻia hoʻi ia he 2160p i kekahi manawa.

ʻO ke kūlana 4K UHD i hoʻohana ʻia no nā TV, nā monitor, a me nā pāʻani wikiō ua kapa ʻia ʻo ia ka hoʻonā UHD-1 a i ʻole UHDTV, akā i ka hana kiʻiʻoniʻoni a me ke wikiō ʻoihana, ua kapa ʻia ka hoʻonā 4K ʻo DCI-4K (Digital Cinema Initiatives) me 4096 x 2160 pikela a i ʻole 8.8 megapixels i ka huina.

Loaʻa i ka Digital Cinema Initiatives-4K ka lakio hiʻohiʻona 256:135 (1.9:1), ʻoiai ʻo 4K UHD ka lakio maʻamau 16:9.