[RESOLVED] New Thread, New Question :)

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 :eek:. How would I do it in C#, but convert them to their original values as bytes?

Any snippets would be greatly appreciated :D

chem

Code:

---

byte b = (byte) shortVal;

---

I hope this is what you are asking for

Code:

---

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:

Code:

---

Color clr = Color.FromArgb(colourInt);

---

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

Quote:

---

Originally Posted by jmcilhinney

Code:

---

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:

Code:

---

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 :p

I ended up with this:

PHP Code:

---

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


---

The other way seems alot easier. Thanks heaps :D

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

chem

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.

Quote:

---

Originally Posted by 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.

---

Of course you would. ;) :)

Its a better plan than using byte arrays.