getpixel

I want to get a pixel color from another window. The code I have is: 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)

Hello I am trying to get the color of a particular pixel on my JFrame. This is my code. My frame is red. The problem I am having is when I click the Frame it should return me the RGB color for red that is (255,0,0) but when I click at different points i sometimes get the RGB color for white (255,255,255) what is the problem in my code guys? public class guiTest extends JFrame { private static Shape ellipse; private static Robot rb; public guiTest() { super("4-connected approach"); setLayout(new FlowLayout()); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); setSize(800,800);

I'm using Perl and the Image::Magick module to process some JPEGs. I'm using the GetPixels sub to get the RGB components of each pixel. e.g. my @pixels = $img->GetPixels( width => 1, height => 1, x => 0, y => 0, map => 'RGB', #normalize => 1 ) print Dumper \@pixels; $img->Resize( width => 1, height => 1, filter => 'Lanczos' ); @pixels = $img->GetPixels( width => 1, height => 1, x => 0, y => 0, map => 'RGB', #normalize => 1 ); print Dumper \@pixels; $img->Write('verify.jpg'); I've found that getPixels is returning two bytes per channel, e.g. $VAR1 = [ 46260, 45232, 44975 ]; $VAR1 = [ 58271,

I'm still trying to solve the problem I've had since a couple of days ago and I still have not found a solution. However, I am getting there step by step. Now I have run into another roadblock. I am trying to get Bitmap.getpixel(int x, int y) to return the Color of what the user has touched using OnTouchListener . The pie is a VectorDrawable resource, vectordrawable.xml I don't need to do anything with the pixel data yet, I just need to test it. So I made a TextView that will spit out the Color touched. public class MainActivity extends AppCompatActivity { ImageView imageView; TextView

I have a loop that gets pixelcolors from an image and try to see if they are the same as the Color I passed into the method as parameter. I tried the Equals method but it doesn't work. I also tried the ToKnown method. It looks like that match doesn't work beacuse the values that synthesize the two colors don't match. Example: With GetPixel: {Name=ff000000, ARGB=(255, 0, 0, 0)} Color.Black: {Name=Black, ARGB=(255, 0, 0, 0)} if (pixelColor.ToArgb().Equals(startingOffsetColor.ToArgb())) { } The code above works, but I still want to know if there is any better method or any method that can reduce