In addition to Solution 1, I would like to draw your attention on a few issues:
1. You don't need the
pix
variable, or at least not in the piece of code you have shown. Removing the copy could spare a few cycles (but that won't be a drastic improvement either).
2. You don't need the
a
variable, since you are not interested in the alpha value. Removing it will spare a fair amount of cycles since its assignation is done inside your nested for loops.
r
,
g
and
b
variables are not really mandatory either, unless for debuging purposes; but if you do not want to use them elsewhere than in the string building, you can get rid of them too.
3. String concatenations, especially in long loops, are also quite time consuming since they involve a lot of string copy operations internally. Here I would use a
StringBuilder
to try to gain some performance.
This way:
using System.Text;
public void PixelValues()
{
listBox1.SuspendLayout();
newBitmap = (Bitmap)pictureBox1.Image;
Color pixel;
StringBuilder sb = new StringBuilder(33);
for (int i = 0; i < pix.Width; i++)
{
for (int j = 0; j < pix.Height; j++)
{
pixel = newBitmap.GetPixel(i, j);
sb.AppendFormat("Red: {0} - Green: {1} - Blue: {2}", pixel.R, pixel.G, pixel.B);
listBox1.Items.Add(sb.ToString());
sb.Clear();
}
}
listBox1.ResumeLayout();
}
You could also use a
List<string>
instead of adding items to the
ListBox
one by one, and add the whole lot of them at the end with the
AddRange
method of the
ListBox
class, but I'm not sure it would give a significant improvement. That could be tested, though, just to be sure.
Hope this helps. Kindly.