Mediante este tip vamos a ver que se entiende por RGB y como están compuestos estos modelos de color.
La descripción RGB (del inglés Red, Green, Blue; "rojo, verde, azul") de un color hace referencia a su composición de la intensidad de los colores primarios con que se forma: el rojo, el verde y el azul. Este un modelo de color basado en lo q se conoce como síntesis aditiva, con lo que es posible representar a un color por la mezcla por adición de los tres colores luz primarios.
Para indicar con qué proporción se mezcla cada color, le asignamos un valor a cada uno de los colores primarios, así, por ejemplo, el valor 0 significa que no interviene en la mezcla, y en la medida que ese valor aumenta, aportará más intensidad a la mezcla.
Lo que conocemos como píxel es en realidad un conjunto de tres puntos, uno rojo, uno verde y uno azul, cada uno de los cuales brilla con una determinada intensidad.
La gama de colores de la web consiste en 216 combinaciones de rojo, verde y azul, donde cada color puede tomar un valor entre seis diferentes (en hexadecimal): #00, #33, #66, #99, #CC o #FF, que tienen un porcentaje de intensidad de 0%, 20%, 40%, 60%, 80% y 100%, respectivamente.
La codificación hexadecimal del color nos permite expresar fácilmente un color especifico de la escala RGB, utilizando la notación hexadecimal. esta notación la encontramos, por ejemplo, en el lenguaje HTML, JavaScript, o ActionScript, y otros lenguajes
Este sistema utiliza la combinación de tres códigos de dos dígitos para expresar las diferentes intensidades de los colores primarios RGB, por ejemplo:
Blanco y Negro
- negro: #000000 donde los canales estan al minimo: 00, 00, 00.
- blanco: #FFFFFF donde los canales estan al maximo FF, FF, FF.
En este sistema, el hexadecimal, además de los números del 0 al 9 se utilizan seis letras con lo sig valores numéricos
- A =10
- B =11
- C =12
- D =13
- E =14
- F =15
La correspondencia entre la numeración hexadecimal y la decimal u ordinaria se puede representar por la siguiente fórmula:
Código :
decimal = primera cifra hexadecimal * 16 + segunda cifra hexadecimal
Así, cualquier color puede definirse por tres pares de dígitos.
veamos:
Colores Primarios
- rojo: #FF0000 donde el canal rojo esta al máximo y los otros al mínimo: FF, 00, 00.
- verde: #00FF00 donde el canal verde esta al máximo y los otros al mínimo: 00, FF, 00.
- azul: #0000FF donde el canal azul esta al maximo y los otros al minimo: 00, 00, FF.
Secundarios o CYM (Cyan, Yellow, Magenta)*
- cian: #00FFFF donde los canales azul y verde están al máximo: 00, FF, FF.
- amarillo (yellow): #FFFF00 donde los canales rojo y verde están al máximo: FF, FF, 00.
- magenta: #FF00FF donde los canales rojo y azul están al máximo: FF, 00, FF.
*CYMK se le agraga la "K" de "key" q es el negro
Colores HTML o web
- cyan: #00FFFF
- gray: #808080
- navy: #000080
- silver:#C0C0C0
- black: #000000
- green: #008000
- olive: #808000
- teal: #008080
- blue: #0000FF
- lime: #00FF00
- purple: #800080
- fuchsia: #FF00FF
- maroon: #800000
- red: #FF0000
- yellow: #FFFF00
- white: #FFFFFF
ahora, podremos por ejemplo usar perfectamente la clase ColorTransform de ActionScript, saber en q medida queremos cada valor para r, g, y b.
en fin, espero les sirva
¿Sabes SQL? ¿No-SQL? Aprende MySQL, PostgreSQL, MongoDB, Redis y más con el Curso Profesional de Bases de Datos que empieza el martes, en vivo.
Por Jatrix13 el 29 de Octubre de 2007
Muy bueno y educativo, yo ni sabia el porque de los codigos... lo de AS cuando aprenda lo llevaré a cabo.
Por Victor-Nael el 30 de Octubre de 2007
Por Elke el 30 de Octubre de 2007
Ahora entiendo mejor la notación hexadecimal.
Por darklord el 30 de Octubre de 2007
Y quizas alguien no entienda algun termino.
Alguna vez se han preguntado porque los humanos vemos los colores?
Es porque en nuestros ojos tenemos 3 tipos de receptores. unos captan las ondas espectrales bajas(rojo), otros las medias(verde) y otros las altas(azul). Cuando a una persona le falta algun tipo de receptor es daltonica, aunque tambien puede ser un problema cerebral. Por eso cada persona ve el color de una forma diferente. Si ahora mismo te pusieran los ojos de otra persona, te quedarias mosqueado porque no verias de la misma forma el color. nosostros vemos los objetos porque la luz rebota en ellos y entra por nuestros ojos. Por eso cuando hay ausencia de luz no vemos nada.
Cuando un objeto es rojo, es porque ha absorvido la luz verde y la luz azul, por lo tanto rebota la luz rojo, que es la que nos hace ver el objeto rojo. Esto seria la teoria aditiva.
La teoria sustractiva se referiria los colores que crean a traves de los pigmentos, es decir tintas. cuando mezclas los 3 colores primarios(color luz), se produce el blanco. Pues en la teoria sustractiva es al contrario, cuando mezclas cian, magenta y amarillo al 100% se crea el color negro.
Alguna vez has entrado a photoshop has cogido el azul mas electrico que exise (R:0,G:0,B:255) y luego lo has pasado a modo CMYK?
Comprobaras que el azul se ha convertido en azul oscuro y gris.
Porque?
muy sencillo es porque has pasado de color luz a color tinta, y el espectro de luminosidad del rgb es mucho mas alto que el de CMYK. Alguna vez has alumbrado una habitación a oscuras con una hoja impresa en tu impresora de casa? NO!! porque las tintas no emiten luz. Por eso los diseñadores que diseñan para papel siempre lo hacen en cmyk, porque asi no se daran sustos de saltos de color cuando vean el impreso
Por el 30 de Octubre de 2007
darklord :
Y quizas alguien no entienda algun termino.
tienes idea de donde estas parado?
Por darklord el 30 de Octubre de 2007
Por Aiman el 30 de Octubre de 2007
Por Rog3R el 30 de Octubre de 2007
penHolder :
es 00, 00, FF ¿no?
Por Victor-Nael el 31 de Octubre de 2007
darklord :
Esta es una web de diseño web
darklord :
No es cierto algunos tenemos la libertad de trabajar en RGB.
Por lemostro el 31 de Octubre de 2007
La mezcla sustractiva por el contrario absorbe la luz, y la suma de sus colores da como resultado negro o ausencia de luz, ejemplo: plastilina, tinta, crayolas, etc. (Los medios impresos manejan CMYK como las impresoras de color que tienen 4 cartuchitos ) La gama de colores CMYK es menor que la RGB es por eso que al mezclar CMY queda un color pardo, se necesita agregarle K (negro - blacK) para lograr el tono más oscuro.
Todo se resume a emisión y absorción de luz, en realidad hay dos tipos de colores primarios los sustractivos y los aditivos!
Saludos!
Por darklord el 31 de Octubre de 2007
No deberias trabajar para papel en rgb, es peligroso...te puedes llegar a dar un susto, igual tu no porque sabes que cuando imprimas va a cambiar, pero si tu cliente, si le envias una prueba en rgb y luego lo ve en cmyk y ve el bajon de luminosidad.....
Ademas algunos impresores tienes maquinas que tienen cierta calibracion de color para imprimir y al enviarles en rgb son las maquinas las que hacen ese cambio de color segun sus valores, que luego no son los esperados....
En cuanto a lo del diseño web. pos tienes razon. pero estas teorias se amplian a otros campos, y a veces en cristalab se habla tambien de photoshop que tambien se utiliza para otro tipo de diseños. Asi que me parecio interesante ampliar un poco el comentario.
No hace falta enojarse
Por penHolder el 31 de Octubre de 2007
Rog3R, gracias por la correccion, tanto colorear letras se me paso; y tb gravias a el/la BOFH/SWAT q lo haya arreglado
Por darklord el 31 de Octubre de 2007
Por Inyaka el 31 de Octubre de 2007
claro que si la tomas con alguien lo mas probable es que unos simpáticos caballeros rusos visiten tu hogar
Por Victor-Nael el 01 de Noviembre de 2007
darklord :
No deberias trabajar para papel en rgb, es peligroso...
Ya lo se, es por eso que digo que una de mis ventajas es que uso flash y fireworks, para trabajar en impresion, ya se que van a decir, que las paletas de flash y fireworks son pare web, eso lo se perfectamente pero mi amor por macromedia es tan grande que yo uso esos 2 programas para trabajar en papel, muchos me critican de que es una mala practica, pero como tu sabras los que trabajamos en la publicidad impresa, jamas tendremos oportunidad de hacer una web con codigo, por que ser diseñador web es un sueño que tengo u_un, pero el destino me llevo al diseño en "Artes Graficas", asi que en venganza uso Rgb en vez de CMYK. (Solo de esta forma puedo demostrar mi gran a mor hacia macromedia)
Ps: No te preocupes darklord, mis maquinas estan calibradas para que puedan trabajar Rgb y CMYK, estan totalmente configuradas para que trabajen a mi modo (MODO CMYK :: MODO RGB O_0n)
Por alumno sena el 25 de Marzo de 2008
Por jua caires el 02 de Abril de 2008
Por GoriGori el 15 de Mayo de 2008
Gracias
Por nayli ortiz el 01 de Junio de 2008
Por TAC el 04 de Enero de 2009
Por hugonski el 30 de Abril de 2009
Por plugis-gis el 04 de Septiembre de 2009
tenemos las tv de plasma , las tv de lcd, y las tv de oled, sin olvidarnos las ya obsoletas crt, bueno ya os seguire informando.....
Por santiago el 24 de Febrero de 2010
justo lo q estaba buscando gracias....
Por yovana el 03 de Julio de 2010
me ayuda mucho es mis clase y es un buen tema okisss...
Por nancy el 09 de Enero de 2011
Por jack vargas el 15 de Enero de 2011
Por alison el 02 de Marzo de 2011
Por Ningel el 19 de Marzo de 2011
¿ A Que se refiere color indexado?
Saludos
Por ALEJANDRO el 20 de Enero de 2012
Por penHolder el 20 de Enero de 2012
ALEJANDRO-blog :
need a BOFH here
Por dan el 11 de Abril de 2012
Por sabina el 25 de Enero de 2013
Por 👀 el 24 de Octubre de 2014
Por hector pizarro el 19 de Enero de 2015
Por Jonathan el 21 de Octubre de 2015
¡Gracias!
Por José el 31 de Enero de 2018
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Por Hj Seijas el 19 de Marzo de 2018