CSS hexadecimal RGBA

Question

I know you can write      background-color   ff0000        if you want something that is red   And you can write      background-color  rgba 255  0  0  0 5         if you want something red and translucent   Is there any terse way of writing partially transparent colors in hexadecimal  I want something like   background-color   ff000088   lt --- the 88 is the alpha       or      background-color   ff0000 50     I am getting all my colors in hexadecimal  and having to convert them all to the decimal 0-255 scale is annoying

User · Answer

See here http   www w3 org TR css3-color  rgba-color  It is not possible  most probably because 0xFFFFFFFF is greater than the maximum value for 32bit integers

User · Answer

Use red  green  blue to convert to RGBA    background-color  rgba red  color   green  color   blue  color   0 2

User · Answer

Well  different color notations is what you will have to learn  Kuler gives you a better chance to find color and in multiple notations   Hex is not different from RGB  FF   255 and 00   0  but that s what you know  So in a way  you have to visualize it   I use Hex  RGBA and RGB  Unless mass conversion is required  manually doing this will help you remember some odd 100 colors and their codes   For mass conversion write some script like one given by Alarie  Have a blast with Colors

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Charming Prince   Only internet explorer allows the 4 byte hex color in the format of ARGB  where A is the Alpha channel  It can be used in gradient filters for example   filter      progid DXImageTransform Microsoft Gradient GradientType   dir  startColorstr   color1  endColorstr   color2       Where dir can be  1 horizontal  or 0 vertical  And the color strings can be hex colors  FFAAD3  or argb hex colors  88FFAAD3

User · Answer

RGB   ffabcd   A  0 5   RGBA     parseInt RGB substring 1 3  16      parseInt RGB substring 3 5  16      parseInt RGB substring 5 7  16      A

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I found the answer after posting the enhancement to the question  Sorry   MS Excel helped   simply add the Hex prefix to the hex colour value to add an alpha that has the equivalent opacity as the   value    in rbga the percentage opacity is expressed as a decimal as mentioned above   Opacity     255 Step        2 digit HEX prefix 0           0 00            00 5           12 75           0C 10          25 50           19 15          38 25           26 20          51 00           33 25          63 75           3F 30          76 50           4C 35          89 25           59 40          102 00          66 45          114 75          72 50          127 50          7F 55          140 25          8C 60          153 00          99 65          165 75          A5 70          178 50          B2 75          191 25          BF 80          204 00          CC 85          216 75          D8 90          229 50          E5 95          242 25          F2 100         255 00          FF

User · Answer

Chrome 52  supports alpha hex   background   56ff0077

User · Answer

why not use  background-color   ff0000   opacity  0 5    filter  alpha opacity 50      in IE     if you target a color for a text or probably an element  this should be a lot easier to do

User · Answer

The CSS Color Module Level 4 will probably support 4 and 8-digit hexadecimal RGBA notation   Three weeks ago  18th of December 2014  the CSS Color Module Level 4 editor s draft was submitted to the  CSS W3C Working Group  Though in a state which is heavily susceptible to change  the current version of the document implies that in the somewhat near future CSS will support both the 4 and 8-digit hexadecimal RGBA notation   Note  the following quote has irrelevant chunks cut out and the source may have been heavily modified by the time you read this  as mentioned above  it s an editor s draft and not a finalised document  If things have heavily changed  please leave a comment letting me know so I can update this answer         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       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   expanded  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    What does this mean for the future of CSS colours   This means that assuming this isn t completely removed from the Level 4 document  we ll soon be able to define our RGBA colours  or HSLA colours  if you re one of those guys  in hexadecimal format in browsers which support the Color Module Level 4 s syntax   Example  elem       background  rgb 0  0  0                RGB notation  no alpha          background   000                       3-digit hexadecimal notation  no alpha          background   000000                    6-digit hexadecimal notation  no alpha          background  rgba 0  0  0  1 0          RGBA notation             The new 4 and 8-digit hexadecimal notation         background   0000                      4-digit hexadecimal notation         background   00000000                  8-digit hexadecimal notation         When will I be able to use this in my client-facing products     All jokes aside  it s currently only the start of 2015  so these will not be supported in any browser for quite some time yet - even if your product is only designed to work on the most up-to-date of browsers you ll probably not be seeing this in action in a production browser any time soon   View current browser support for  RRGGBBAA color notation  However  that said  the way CSS works means that we can actually start using these today  If you really want to start using them right now  as long as you add a fall back any non-supporting browsers will simply ignore the new properties until they are deemed valid    x000D   x000D  figure   x000D    margin  0  x000D    padding  4px  x000D     x000D       Fall back     to browsers which don t support alpha transparency      x000D    background   FEFE7F  x000D    color   3F3FFE  x000D     x000D       Current  modern  browser support     x000D    background  rgba 255  255  0  0 5   x000D    color  rgba 0  0  255  0 75   x000D     x000D       Fall    foward     x000D    background   ffff007F     Or  less accurately   ff08    x000D    color   0000ffbe          Or  00fc    x000D    x000D   lt figure gt Hello  world  lt  figure gt  x000D   x000D   x000D    As long as you re viewing this answer on a browser which supports the background and color properties in CSS  the  lt figure gt  element in result of the above snippet will look very similar to this     Using the most recent version of Chrome on Windows  v39 0 2171  to inspect our  lt figure gt  element  we ll see the following     The 6-digit hexadecimal fall back is overridden by the rgba   values  and our 8-digit hexadecimal values are ignored as they are currently deemed invalid by Chrome s CSS parser  As soon as our browser supports these 8-digit values  these will override the rgba   ones   UPDATE 2018-07-04  Firefox  Chrome and Safari are support this notation now  Edge still missing but will probably follow  https   caniuse com  feat css-rrggbbaa

User · Answer

I m afraid that s not possible  the rgba format you know is the only one

User · Answer

In Sass we can write  background-color  rgba  ff0000  0 5    as it was suggested in Hex representation of a color with alpha channel

User · Answer

If you can use LESS  there is a fade function    my-opaque-color   a438ab   my-semitransparent-color  fade  my-opaque-color  50     background-color linear-gradient to right  my-opaque-color   my-semitransparent-color        result   background-color  linear-gradient to right   a438ab  rgba 164  56  171  0 5

[css] CSS hexadecimal RGBA?

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