How to get the colour of a pixel at X,Y using c#?
There's Bitmap.GetPixel
for an image... is that what you're after? If not, could you say which x, y value you mean? On a control?
Note that if you do mean for an image, and you want to get lots of pixels, and you don't mind working with unsafe code, then Bitmap.LockBits
will be a lot faster than lots of calls to GetPixel
.
To get a pixel color from the Screen here's code from Pinvoke.net:
using System;
using System.Drawing;
using System.Runtime.InteropServices;
sealed class Win32
{
[DllImport("user32.dll")]
static extern IntPtr GetDC(IntPtr hwnd);
[DllImport("user32.dll")]
static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);
[DllImport("gdi32.dll")]
static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);
static public System.Drawing.Color GetPixelColor(int x, int y)
{
IntPtr hdc = GetDC(IntPtr.Zero);
uint pixel = GetPixel(hdc, x, y);
ReleaseDC(IntPtr.Zero, hdc);
Color color = Color.FromArgb((int)(pixel & 0x000000FF),
(int)(pixel & 0x0000FF00) >> 8,
(int)(pixel & 0x00FF0000) >> 16);
return color;
}
}