Choosing color by Hexadecimal codes

Hexadecimal color is the color mode used on the web and web designing. It’s a very efficient method, using only six digits to identify a single color out of the 16.8 million available on modern computer monitors. This tutorial will help you understand what “hexadecimal” means, and how to predict its color by six digits.



In Color Picker dialog, you can set the RGB color by Hexadecimal values. in this way, three pairs of digits define the color which are from 00 (lowest value) to FF (highest value). For instance 000000 is black or ffffff is white and ff0000 is red. In Adobe Photoshop color picker you can enter hexadecimal digits in # field. also this field shows the hexadecimal value of the selected color. Hexadecimal codes always start with # in HTML and CSS coding or in some software such as Adobe Dream weaver. But in Adobe Photoshop there is no need to type # and it has already written for you.




Hexadecimal has its own color wheel that is similar to RGB standard color wheel. You can see primary, secondary and tritiary colors on it. Hexadecimal digits of colors also defined.

click on the image below to enlarge it.


  • Hexadecimal Color Rules

There are 4 important rules to remember about hexadecimal color:

1- In decimal numbers, each digit can be among 0 to 9 so it contain totally ten digit. That is how we normally count. In hexadecimal each digit can be any number from 0 to 9 and (or) any letter from A to F. It give you sixteen possibilities:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f (from lowest to highest).

2- In decimal numbers, two digit can give you 100 possibilities from 0 to 99. In hexadecimal, you can get 256 possibilities by sixteen digits. So it is very convenient for calculating.







3- In hexadecimal, first two digits define red color, second pair is green and last pair is blue. each pair can have 256 possibilities. 256 x 256 x 256 = 16.8 million.

4- Hexadecimal is base 16 and the numbers start from zero through to the letter F (0123456789ABCDEF). the decimal value for '1' is represented in hexadecimal as '1' but the decimal value of '15' is shown as 'F' in hexadecimal and the value of '17' in decimal is '11' in hexadecimal.

In the following table you can see decimal, hexadecimal and binary codes.

Binary
Decimal
Hex
Binary
Decimal
Hex
Binary
Decimal
Hex
0000
0
0
1010
10
A
00010100
20
14
0001
1
1
1011
11
B
00011110
30
1E
0010
2
2
1100
12
C
00101000
40
28
0011
3
3
1101
13
D
00110010
50
32
0100
4
4
1110
14
E
00111100
60
3C
0101
5
5
1111
15
F
01000110
70
46
0110
6
6
00010000
16
10
01010000
80
50
0111
7
7
00010001
17
11
01011010
90
5A
1000
8
8
00010010
18
12
10000000
128
80
1001
9
9
00010011
19
13
11111111
255
FF

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