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Teoria Culorilor

Tue, Mar 17, 2009

Culori in WebDesign

Pentru o intelegere cat mai buna a Teoriei Culorilor trebuie sa avem cateva cunostinte tehnice, de genul – formarea culorilor si impartirea lor in categorii.

Culorile care apar pe display-ul calculatorului tau sunt bazate pe modelul aditiv (iti povesteam in Fizica Culorilor). Astfel culorile apar in procentaj(%) de rosu, verde si albastru (RGB). Daca toate sunt 100%, avem lumina alba, iar  daca oprim albastru si raman verde si rosu 100% vom avea culoarea galben. Si asa mai departe.

Ai avut vreodata o imprimanta color? Ai schimbat tonerele la ea? Inseamna ca ai auzit de CMYK (cyan, magenta, yellow, black). La imprimantele color,  dar mai ales in tipografie se folosesc cerneluri de aceste culori. Procesul de combinare al acestora se numeste modelul substractiv al culorilor. Fata de modul aditiv, cand din combinarea celor trei culori obtineam negru, in modul substractiv vom obtine un gri foarte inchis. De aceea este nevoie de a patra culoare, negru.

Pentru exemplificare imaginea de mai jos am descompus-o in CMYK.

imagine-cmyk

Ideile de baza ar fi:

  • metoda aditiva este folosita pentru display-uri si  tv, iar metoda substractiva pentru print.
  • metoda aditiva -> mai multa culoare -> spre alb
  • metoda substractiva -> mai multa culoare -> spre negru

Roata culorilor

Roata culorilor reprezinta o diagrama simpla care pune in evidenta conceptele teoriei culorilor. De fapt ce este ea? Este un cerc impartit in 12 “felii”,  fiecare “felie” are o culoare primara, secundara sau tertiara. In total sunt 3 primare, 3 secundare si 6 tertiare.

1. Culorile primare

roata-culorilor

Culorile primare ale rotii culorilor sunt: Rosu, Galben si Albastru. Ele formeaza un triunghi echilateral pe roata culorilor, iar fiecare a patra culoare dupa una primara este tot o primara.

2. Culorile secundare

Culorile secundare sunt formate din combinarea culorilor principale  (combinate 2 cate 2). Astfel avem:  Verde, Orange si Violet. (cele din dreptul triunghiurilor mai deschise la culoare)

3. Culorile tertiare

Culorile tertiare sunt formate din combinarea unei culori principale cu o culoare secundara adiacenta.

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