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Is there a hex code for transparent bg color?
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Working with hexadecimal color code. It isn´t specificaly for a website, but for a color puzzle, but I figured somebody here would help the best. I´m looking for a way to write down just transperent color (Notning). I looked it up and found that #ffffff00 or #000000 should do the trick?
If anyone has any experience, every idea is helpfull. Thank you.
There is no such thing; transparency is done via another channel.
It depends on the format. Some systems require RRGGBB, which doesn't include alpha.
Some have their format as AARRGGBB, so your provided color would be 05FF00FF.
Conversely, some have their format as RRGGBBAA, thus your provided color would be FF00FF05.
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?
Quoting maleta in a now-deleted comment:
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 (2016-12-27 10:32:28Z, License: CC BY-SA 3.0)
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.
HEXA - #RRGGBBAA
There's a relatively new way of doing transparency and it's called HEXA (HEX + Alpha). It takes in eight digits instead of six. The last pair is Alpha. So the pattern of pairs is #RRGGBBAA. Having four digits also works: #RGBA
I am not sure about its browser support for now, but you can check the draft documentation for more information.
§ 4.2. The RGB hexadecimal notations: #RRGGBB
The syntax of a
<hex-color>is a<hash-token>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 digits0-9or lettersa-f(the case of the letters doesn’t matter -#00ff00is 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
00represents a fully transparent color andffrepresent a fully opaque color.Example 3
In other words,#0000ffccrepresents the same color asrgba(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
0represents the minimum value andfrepresents 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:
Transparency is a property outside the color itself, and it's also known as alpha component. You can't code transparency as pure RGB (which stands for red-green-blue channels), but you can use the RGBA notation, in which you define the color + alpha channel together:
color: rgba(255, 0, 0, 0.5); /* red at 50% opacity */
If you want "transparent", just set the last number to 0, regardless of the color. All of the following result in "transparent" even though the color part is set to 100% red, green and blue respectively:
color: rgba(255, 0, 0, 0); /* transparent */
color: rgba(0, 255, 0, 0); /* transparent */
color: rgba(0, 0, 255, 0); /* transparent */
There's also the HEXA notation (or RRGGBBAA) now supported on all major browsers, which is pretty much the same as RGBA but using hexadecimal notation instead of decimal:
color: #FF000080; /* red at 50% opacity */
Additionally, if you just want a transparent background, the simplest way to do it is:
background: transparent;
You can also play with opacity, although this might be a tad too much and have unwanted side effects in your case:
.half {
opacity: 0.5;
filter: alpha(opacity=50); /* needed to support IE, my sympathies if that's the case */
}
If you happen to have Illustrator and Photoshop open at the same time you can just use Photoshop's color picker. Just use the eye-dropper to click anywhere inside your Photoshop canvas and drag your cursor over to the the area you want to sample in Illustrator (or anywhere else for that matter).
There are also countless other stand-alone color pickers you can use (apps, extensions etc.)
There's a proper way, and there's an easy way:
1) The proper way: You can flatten transparencies. Make sure to save to a new file before doing this as it will "break apart" your illustration, making it harder to edit after.
2) The easy way: Just screenshot a zone of the color with opacity and then color-pick the resulting image. ("CMD + SHIFT + 4" if you're on a Mac for selective screenshotting) Or as Cai noted: If you use "CMD+CTRL+SHIFT+4", it doesn't make even make a file on your desktop, it keeps the image in your clipboard, and then you can paste it into your illustrator directly while keeping your desktop clutter-free.
Note: I'm guessing some people will say you should never screenshot colors for reference, as saving to PNG probably alters the colors very very slightly, but I've never had a problem and find that to be easier than to flatten.