[RESOLVED] New Thread, New Question :)

[chemicalNova]

Howdy all,

I've constructed a color value from 3 bytes of R, G and B. This is stored in an int...

What I want to know is, how would I retrieve the values back into bytes again? I have a few VB6 examples but they all turn them into integers (shorts), and I'm not sure how to implement even those . How would I do it in C#, but convert them to their original values as bytes?

Any snippets would be greatly appreciated

chem

[ComputerJy]

byte b = (byte) shortVal;

I hope this is what you are asking for

[jmcilhinney]

byte[] colourBytes = BitConverter.GetBytes(colourInt);

Note that you can also do the following if your integer was created in the correct format in the first place, including an alpha value:

Color clr = Color.FromArgb(colourInt);

Then you can get the A, R, G and B values from the appropriate properties of the Color object.

[chemicalNova]

byte[] colourBytes = BitConverter.GetBytes(colourInt);

Note that you can also do the following if your integer was created in the correct format in the first place, including an alpha value:

Color clr = Color.FromArgb(colourInt);

Then you can get the A, R, G and B values from the appropriate properties of the Color object.

Woah. If I had known it was that simple, I wouldn't have spent days researching it

I ended up with this:

r = (byte)(realVal & 0xFF);
g = (byte)((realVal & 0xFF00FF00) / 0x100);
bc = (byte)((realVal & 0xFF0000) / 0x10000); 

The other way seems alot easier. Thanks heaps

EDIT: Bah, I gave you reputation recently jmc. Stupid forums. Thanks again

chem

[wossname]

Storing 3 bytes of bitmap data in a 4 byte variable is just a waste of a byte.
I'd be inclined to create a struct...

struct pixel
{
byte B;
byte G;
byte R;
}

and use "unsafe" code (pointers) to manage the mathematics behind it.

[jmcilhinney]

Storing 3 bytes of bitmap data in a 4 byte variable is just a waste of a byte.
I'd be inclined to create a struct...

struct pixel
{
byte B;
byte G;
byte R;
}

and use "unsafe" code (pointers) to manage the mathematics behind it.

Of course you would.

[wossname]

Its a better plan than using byte arrays.