image manipulation

[Telmo Costa]

Hi.
I'm trying to load an image and copy it to an array of bytes.
The image is a png 32bit format. The code I have is:

-------------------------------------------------------------
public void LoadImage(path) {
Bitmap image = new Bitmap(path);
byte[] pixels = new byte[image.Width*image.Height*4];
int offset;

for (int x=0; x<image.Width; x++) {
for (int y=0; y<image.Height; y++) {
Color c = image.GetPixel(x, y);
offset = (y*image.Width + x)*4;
pixels[offset] = c.R;
pixels[offset+1] = c.G;
pixels[offset+2] = c.B;
pixels[offset+3] = c.A;
)
);
}

 

[Morten Wennevik]

Hi Telmo,

It would be much faster to use an unsafe code block and access the raw pixel data.
Bob Powell's article should get you started.

"Using the LockBits method to access image data"
http://www.bobpowell.net/lockingbits.htm

Hi.
I'm trying to load an image and copy it to an array of bytes.
The image is a png 32bit format. The code I have is:

-------------------------------------------------------------
public void LoadImage(path) {
Bitmap image = new Bitmap(path);
byte[] pixels = new byte[image.Width*image.Height*4];
int offset;

for (int x=0; x<image.Width; x++) {
for (int y=0; y<image.Height; y++) {
Color c = image.GetPixel(x, y);
offset = (y*image.Width + x)*4;
pixels[offset] = c.R;
pixels[offset+1] = c.G;
pixels[offset+2] = c.B;
pixels[offset+3] = c.A;
)
);
}