Transparent ARGB hex value

Question

The colors in this table is all not transparent. I guess the value for the A is set to FF.

What is the code for transparency?

For example this color FFF0F8FF (AliceBlue), to a transparent code such as ??F0F8FF ?

Solution 1

Transparency is controlled by the alpha channel (AA in #AARRGGBB). Maximal value (255 dec, FF hex) means fully opaque. Minimum value (0 dec, 00 hex) means fully transparent. Values in between are semi-transparent, i.e. the color is mixed with the background color.

To get a fully transparent color set the alpha to zero. RR, GG and BB are irrelevant in this case because no color will be visible. This means #00FFFFFF ("transparent White") is the same color as #00F0F8FF ("transparent AliceBlue"). To keep it simple one chooses black (#00000000) or white (#00FFFFFF) if the color does not matter.

In the table you linked to you'll find Transparent defined as #00FFFFFF.

Solution 2

Here is the table of % to hex values:

Example: For 85% white, you would use #D9FFFFFF. Here 85% = "D9" & White = "FFFFFF"

100% — FF
95% — F2
90% — E6

85% — D9

80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C
50% — 80
45% — 73
40% — 66
35% — 59
30% — 4D
25% — 40
20% — 33
15% — 26
10% — 1A
5% — 0D
0% — 00

How is it calculated?

FF is number written in hex mode. That number represent 255 in decimal. For example, if you want 42% to calculate you need to find 42% of numbeer 255 and convert that number to hex. 255 * 0.42 ~= 107 107 to hex is "6B – maleta

Solution 3

Adding to the other answers and doing nothing more of what @Maleta explained in a comment on https://stackoverflow.com/a/28481374/1626594, doing alpha*255 then round then to hex. Here's a quick converter http://jsfiddle.net/8ajxdLap/4/

function rgb2hex(rgb) {
  var rgbm = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?((?:[0-9]*[.])?[0-9]+)[\s+]?\)/i);
  if (rgbm && rgbm.length === 5) {
    return "#" +
      ('0' + Math.round(parseFloat(rgbm[4], 10) * 255).toString(16).toUpperCase()).slice(-2) +
      ("0" + parseInt(rgbm[1], 10).toString(16).toUpperCase()).slice(-2) +
      ("0" + parseInt(rgbm[2], 10).toString(16).toUpperCase()).slice(-2) +
      ("0" + parseInt(rgbm[3], 10).toString(16).toUpperCase()).slice(-2);
  } else {
    var rgbm = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i);
    if (rgbm && rgbm.length === 4) {
      return "#" +
        ("0" + parseInt(rgbm[1], 10).toString(16).toUpperCase()).slice(-2) +
        ("0" + parseInt(rgbm[2], 10).toString(16).toUpperCase()).slice(-2) +
        ("0" + parseInt(rgbm[3], 10).toString(16).toUpperCase()).slice(-2);
    } else {
      return "cant parse that";
    }
  }
}

$('button').click(function() {
  var hex = rgb2hex($('#in_tb').val());
  $('#in_tb_result').html(hex);
});

body {
  padding: 20px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Convert RGB/RGBA to hex #RRGGBB/#AARRGGBB:<br>
<br>
<input id="in_tb" type="text" value="rgba(200, 90, 34, 0.75)"> <button>Convert</button><br>
<br> Result: <span id="in_tb_result"></span>

Solution 4

BE AWARE 👇🏼

In HTML/CSS (browser code) the format is #RRGGBBAA with the alpha channel as last two hexadecimal digits.

Solution 5

Just use this :

android:background="#00FFFFFF"

it will do your work.

View more solutions

Comments

[Almir Campos]

Finally there is a way to set transparent color with hex code for certain browsers (new feature). Please, take a look at stackoverflow.com/a/60876347/2457251

[user3332579]

let's say I need 50% opacity. What is the code for white color with 50% opacity/transparent?

[theHacker]

@user3332579: 50% is 7F. Put your calculator in hex mode, it will do the trick for you.

[theHacker]

@user3332579: So 50% white is #7FFFFFFF.

[Saeed Jassani]

how do you calculate this?

[maleta]

@SaeedJassani FF is number written in hex mode. That number represent 255 in decimal. For example, if you want 42% to calculate you need to find 42% of numbeer 255 and convert that number to hex. 255 * 0.42 ~= 107 107 to hex is "6B"

[Saeed Jassani]

@Maleta Thanks a lot

[SGS Sandhu]

The format is #RRGGBBAA Hex8 (or #RGBA in Hex4) and NOT #AARRGGBB (or #ARGB) I have tested in Chrome 62,63,64 Refer to CanIUse.com , https://css-tricks.com/8-digit-hex-codes/ , Chrome Feature Status

[theHacker]

@SGSSandhu The question is not targeted at CSS. See the question again, the format is ARGB.

[Dale Clifford]

It's important if you're using gradients - otherwise blending through white will show traces of grey.