HTML语言剖析（十五）调色原理 (1)

HTML 的颜色表示可分两种 以命名方式定义常用的颜色，如 RED。 以 RGB 值表示，如 #FF0000 表示 red。

命名方式涵括的色种不多亦不甚方便，较少采用，以下介绍 RGB 值的原理

众所皆知颜色是由 "red" "green" "blue" 三原色组合而成的，在 HTML 中对於彩度的定义是 采十六进位的，对於三原色 HTML 分别给予两个十六进位去定义，也就是每个原色可有 256 种彩度，故此三原色可混合成一千六佰多万的颜色。

例如
白色的组成是 red=ff, green=ff, blue=ff, RGB 值即为 ffffff
红色的组成是 red=ff, green=00, blue=00, RGB 值即为 ff0000
绿色的组成是 red=00, green=ff, blue=00, RGB 值即为 00ff00
蓝色的组成是 red=00, green=00, blue=ff, RGB 值即为 0000ff
黑色的组成是 red=00, green=00, blue=00, RGB 值即为 000000

於应用时常在每个 RGB 值之前加上符号 # 以示分别，但不加亦可。

■ HTML 基本架构选按不同颜色按键以测试前景颜色效果 (只适合 Internet Explorer) 选按不同颜色按键以测试背景颜色效果 或输入一个 RGB 颜色码或名称 ■ 16 常用颜色表ColorValueNameColorValueName#00FFFFaqua#808080gray#000080navy#C0C0C0silver#000000black#008000green#808000olive#008080teal#0000FFblue#00FF00lime#800080purple#FFFF00yellow#FF00FFfuchsia#800000maroon#FF0000red#FFFFFFwhite■ 其它常用颜色表ColorValueNameColorValueName#F0F8FFaliceblue#A00000antiquewith#7FFFD4aquamarine#F0FFFFazure#F5F5DCbeige#FFE4C4bisque#000000black#FFEBCDblanchedalmond#0000FFblue#8A2BE2blueviolet#A52A2Abrown#DEB887burlywood#5F9EA0cadetblue#7FFF00chartreuse#D2691Echocolate#FF7F50coral#C0F000cornfloewrblue#FFF8DCcornsilk#00FFFFcyan#00008Bdarkblue#008B8Bdarkcyan#B8860Bdarkgoldenrod#A9A9A9darkgray#006400darkgreen#DA0000darkhaki#8B008Bdarkmagenta#556B2Fdarkolivegreen#DA000Edarkorenge#9932CCdarkorchid#8B0000darkred#E9967Adarksalmon#8FBC8Fdarkseagreen#483D8Bdarkslateblue#2F4F4Fdarkslategray#00CED1darkturquoise#9400D3darkviolet#FF1493deeppink#00BFFFdeepskyblue#696969dimgray#1E90FFdodgerblue#B22222firebrick#FFFAF0floralwhite#228B22forestgreen#DCDCDCgainsboro#00000Egostwhite#FFD700gold#00E00Dgolenrod#808080gray#008000green#ADFF2Fgreenyellow#F0FFF0honeydew#FF69B4hotpink#CD5C5Cindianred#FFFFF0ivory#F0E68Ckhaki#E6E6FAlavender#FFF0F5lavenderblush#7CFC00lawngreen#FFFACDlemonchiffon#ADD8E6lightblue#F08080lightcoral#E0FFFFlightcyan#0000E0lightgodenrod#0000E0lightgodenrodyellow#0000A0lightgray#90EE90lightgreen#FFB6C1lightpink#FFA07Alightsalmon#20B2AAlightseagreen#87CEFAlightskyblue#0000EBlightslateblue#778899lightslategray#B0C4DElightsteelblue#FFFFE0lightyellow#32CD32limegreen#FAF0E6linen#FF00FFmagenta#800000maroon#66CDAAmediumaquamarine#0000CDmediumblue#BA55D3mediumorchid#ED0000mediumpurpul#3CB371mediumseagreen#7B68EEmediumslateblue#00FA9Amediumspringgreen#48D1CCmediumturquoise#C71585mediumvioletred#191970midnightblue#F5FFFAmintcream#FFE4E1mistyrose#FFE4B5moccasin#FFDEADnavajowhite#000080navy#A0B0E0navyblue#FDF5E6oldlace#6B8E23olivedrab#FFA500orange#0E0EEDorengered#DA70D6orchid#A00D00palegodenrod#98FB98palegreen#AFEEEEpaleturquoise#DB7093palevioletred#FFEFD5papayawhip#FFDAB9peachpuff#CD853Fperu#FFC0CBpink#DDA0DDplum#B0E0E6powderblue#800080purple#FF0000red#BC8F8Frosybrown#4169E1royalblue#8B4513saddlebrown#FA8072salmon#F4A460sandybrown#2E8B57seagreen#FFF5EEseashell#A0522Dsienna#87CEEBskyblue#6A5ACDslateblue#708090slategray#FFFAFAsnow#00FF7Fspringgreen#4682B4steelblue#D2B48Ctan#D8BFD8thistle#FF6347tomato#40E0D0turquoise#EE82EEviolet#00E0EDvioletred#F5DEB3wheat#000E00hite#F5F5F5whitesmoke#FFFF00yellow#9ACD32yellowgreen