Hex colors Numeric representation for transparent

Question

I am building a web CMS in which the user can choose colours for certain site elements  I would like to convert all colour values to hex to avoid any further formatting hassle   rgb x y z   or named colours   I have found a good JS library for that   The only thing that I can t get into hex is  transparent   I need this when explicitly declaring an element as transparent  which in my experience can be different from not defining any value at all     Does anybody know whether this can be turned into some numeric form  Will I have to set up all processing instances to accept hex values or  transparent    I can t think of any other way

User · Answer

HEXA -  RRGGBBAA There s a relatively new way of doing transparency  it s called HEXA  HEX   Alpha   It takes in 8 digits instead of 6  The last pair is Alpha  So the pattern of pairs is  RRGGBBAA  Having 4 digits also works   RGBA I am not sure about its browser support for now but  you can check the DRAFT Docs for more information      4 2  The RGB hexadecimal notations   RRGGBB The syntax of a  lt hex-color gt  is a  lt hash-token gt  token whose value consists of 3  4  6  or 8 hexadecimal digits  In other words  a hex color is written as a hash character   quot   quot   followed by some number of digits 0-9 or letters a-f  the case of the letters doesn   t matter -  00ff00 is identical to  00FF00   8 digits The first 6 digits are interpreted identically to the 6-digit notation  The last pair of digits  interpreted as a hexadecimal number  specifies the alpha channel of the color  where 00 represents a fully transparent color and ff represent a fully opaque color   Example 3In other words   0000ffcc represents the same color as rgba 0  0  100   80    a slightly-transparent blue    4 digits This is a shorter variant of the 8-digit notation   quot expanded quot  in the same way as the 3-digit notation is  The first digit  interpreted as a hexadecimal number  specifies the red channel of the color  where 0 represents the minimum value and f represents the maximum  The next three digits represent the green  blue  and alpha channels  respectively   For the most part  Chrome and Firefox have started supporting this

User · Answer

I was also trying for transparency - maybe you could try leaving blank the value of background e g  something like   bgcolor

User · Answer

Transparency is a property outside the color itself  also known as alpha component  You can t code it as RGB   If you want a transparent background  you can do this   background  transparent    Additionally  I don t know if it might be helpful or not but  you could set the opacity property    half    opacity  0 5    filter  alpha opacity 50       You need both in order to get it working in IE and all other decent browsers

User · Answer

Use following hexadecimal code for transparent text colour   00FFFF00

User · Answer

The alpha channel defines the transparency value of a color  so any color is 100  transparent as long as the alpha value is 0  Typically this four-channel color type is known as RGBA   You can specify RGBA in CSS like so   div       background  rgba 200  54  54  0 5      50  transparent        Note that not all browsers support RGBA  in which case you can specify a fallback   div       background  rgb 200  54  54      fallback        background  rgba 200  54  54  0 5      50  transparent        More information regarding browser support and workarounds can be found here

User · Answer

There are two common approaches for this  either reserve a specific color as being  transparent   in which case you cannot use that color in images without it appearing transparent  or define a fourth channel alongside red  green  and blue called  alpha  which indicates translucency transparency

User · Answer

You can use this conversion table  http   roselab jhu edu  raj MISC hexdectxt html  eg  if you want a transparency of 60   you use 3C  hex equivalent    This is usefull for IE background gradient transparency   filter progid DXImageTransform Microsoft gradient startColorstr  3C545454  endColorstr  3C545454   -ms-filter   progid DXImageTransform Microsoft gradient startColorstr  3C545454  endColorstr  3C545454      where startColorstr and endColorstr  2 first characters are a hex value for transparency  and the six remaining are the hex color

User · Answer

Very simple  no color  no opacity   rgba 0  0  0  0

[css] Hex colors: Numeric representation for "transparent"?

HEXA - #RRGGBBAA

§ 4.2. The RGB hexadecimal notations: #RRGGBB

8 digits

4 digits

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