I-RGB iyengeza futhi yakhiwe ngukukhanya, i-CMYK iyasuswa futhi yakhiwe nge-inki. Ukuguqula phakathi kwazo kuwukwenziwa okutshalwa kuwo wonke umklamo wesikrini ngaphambi kokuphrintwa.
Indlela okuhunyushwa ngayo RGB kuya ku-CMYK
- Linganisa iziteshi: hlukanisa i-R, G kanye ne-B ngo-255.
- Thatha isiteshi esikhulu kunazo zonke ezilinganiswe bese ubala i-key K = 1 − max.
- Thola i-cyan, magenta kanye ne-yellow ngokususa le ngxenye emnyama: C = (1 − R − K) / (1 − K), nokunye okufanayo.
- Guqula wonke amanani amane abe amaphesenti phakathi kuka-0 no-100.
Isibonelo esisebenzayo
Kungukulinganisa kwezibalo ngaphandle kwephrofayela yombala. Izitolo zokuphrinta zisebenzisa ama-ICC profiles nemingcele ye-inki, ngakho lawa manani ayisethenjwa esiqinile, hhayi ukuhlukaniswa okulungele iphrintu ngqo.
RGB no-CMYK kuchazwe
Iyini RGB?
I-RGB ichaza umbala njengesiteshi sesithathu sokukhanya — red, green kanye ne-blue — ngakunye kusuka ku-0 kuya ku-255. Ikhombisa ukuthi izikrini zisebenza ngempela: zonke ezintathu ku-255 zenza umhlophe, zonke ku-0 zenza mnyama. I-RGB ifanele uma kudingeka ukubala ngombala, kanti i-rgba() yengeza ukuphelelwa ukucacisa.
- Isakhiwo:
- rgb(R, G, B)
- Ibanga:
- 0–255 per channel
- Ilungele:
- ikhodi, canvas, ukuphelelwa ukucacisa nge-rgba()
Iyini CMYK?
I-CMYK yimodeli yama-inki amane esetshenziswa ekuphrinteni: cyan, magenta, yellow kanye ne-key (black), ngakunye njengesibalo kusuka ku-0 kuya ku-100%. I-inki isusa ukukhanya esikhundleni sokukhipha, ngakho i-CMYK imboza imibala embalwa kunesikrini — yingakho imibala ekhanyayo yesikrini ivame ukubukeka iyinto ephansi uma iphrintiwe.
- Isakhiwo:
- cmyk(C%, M%, Y%, K%)
- Ibanga:
- 0–100% per ink
- Ilungele:
- ukuphrinta, ukupakisha, umsebenzi wokucindezela olungele iphrinta
Ithebula lokubhekisela le-RGB kuya ku-CMYK
Imibala ye-CSS evame ukusetshenziswa, iguqulwe ukusuka ku-RGB iye ku-CMYK.
| Umbala | RGB | CMYK |
|---|---|---|
| black | rgb(0, 0, 0) | cmyk(0%, 0%, 0%, 100%) |
| white | rgb(255, 255, 255) | cmyk(0%, 0%, 0%, 0%) |
| red | rgb(255, 0, 0) | cmyk(0%, 100%, 100%, 0%) |
| lime | rgb(0, 255, 0) | cmyk(100%, 0%, 100%, 0%) |
| blue | rgb(0, 0, 255) | cmyk(100%, 100%, 0%, 0%) |
| yellow | rgb(255, 255, 0) | cmyk(0%, 0%, 100%, 0%) |
| orange | rgb(255, 165, 0) | cmyk(0%, 35%, 100%, 0%) |
| teal | rgb(0, 128, 128) | cmyk(100%, 0%, 0%, 50%) |
| purple | rgb(128, 0, 128) | cmyk(0%, 100%, 0%, 50%) |
| gray | rgb(128, 128, 128) | cmyk(0%, 0%, 0%, 50%) |