CODEWITHSUNDEEP
c#
karim bem
karim bem

Reputation: 11

how to convert a byte to 4 bytes to be used as color in c#?

I need to convert a byte to 4 bits so it can be used as a color.

byte input;

byte r = //the first and second bits of input ;
byte g = //the third and forth bits of input  ;
byte b = //the fifth and sixth bits of input  ;

Color32 output = new Color32(r,g,b);

I tried working with bit-wise operators but i am not very good at them .

Upvotes: 0

Views: 322

Answers (2)

derpirscher
derpirscher

Reputation: 17382

You can use bitwise operators.

byte input = ...;
r = input & 0x3; // bits 0x1 + 0x2
g =( input & 0xc) >> 2; // bits 0x4 + 0x8
b = (input & 0x30) >> 4; //bits 0x10 + 0x20

The bitwise operator & makes a bitwise and on the input. >> shifts a number to the right by the given number of bits.

Or if by "first and second" bit mean the highest two bits, you can get them as follows

r = input >> 6;
g = (input >> 4) & 0x3;
b = (input >> 2) & 0x3;

Upvotes: 2

Hans Kilian
Hans Kilian

Reputation: 25070

You probably want 11 binary to map to 255 and 00 to map to 0 to get a maximum spread in color values.

You can get that spread by multiplying the 2 bit color value by 85. 00b stays 0, 01b becomes 85, 10b becomes 190 and 11b becomes 255.

So the code would look something like this

    byte input = 0xfc;

    var r = ((input & 0xc0) >> 6) * 85;
    var g = ((input & 0x30) >> 4) * 85;
    var b = ((input & 0x0c) >> 2) * 85;

    Console.WriteLine($"{r} {g} {b}");

Upvotes: 0

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