getpixel

improving speed of GetPixel function in c#

由 Deadly 提交于 2019-12-12 02:43:41
问题 i need to read getpixel of bmp with speed but is very low i used of LockBits private void LockUnlockBitsExample(Bitmap bmp) { Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height); System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, bmp.PixelFormat); IntPtr ptr = bmpData.Scan0; int bytes = Math.Abs(bmpData.Stride) * bmp.Height; rgbValues = new byte[bytes]; System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);

java robot.getPixelColor(x,y) question

由 心已入冬 提交于 2019-12-11 17:31:02
问题 First off the code: for (int i = 0; i < 25; i++) { robot.delay(1000);// wait 1 second Color pixel_4 = robot.getPixelColor(x-15, 30); System.out.println(pixel_4.getRed() + " " + pixel_4.getGreen() + " " + pixel_4.getBlue()); } That is not the exact code I am using, but it produces the same situation: If I run this loop in a program and the screen is precisely the same for the entire loop it will occasionally output something like: 255 255 255 ... (same color) ... ... ... ... ... ... ... 124

How can I get the color of a Panel pixel at the mouse location (RFC)

由 冷暖自知 提交于 2019-12-11 14:56:23
问题 I love SO. In 8 out of 10 questions it produces a straightforward and immediately usable answer. Or at least explains why my question is somehow wrong. So I found it strange that I couldn't find an answer to my liking for this simple and, I had asumed, rather common question. After searching high and low I patched together the below solution. It works alright but I wonder: Are there flaws in it? (e.g.: do I need the dispose?) Is there a better solution, maybe with less copying going on? I'd

VB .NET picture GetPixel & SetPixel: Include alpha?

由 时光总嘲笑我的痴心妄想 提交于 2019-12-11 09:26:59
问题 I am trying to use GetPixel and SetPixel to copy the contents of one picture to another (I know there are other methods to do so, but there are reasons I want to try this ;D) Anyway, the pictures are .png images, so they include transparency settings. But for some reason, it seems like when I use GetPixel & SetPixel to put one image over another, it seems the second image completely replaces the other one. I mean, it seems the transparency settings are not respected when I use GetPixel &

Bitmap.getPixel always returning black

由 我是研究僧i 提交于 2019-12-11 00:59:59
问题 I'm creating an app which involves getting the color of part of the screen. To do this I am using the Bitmap.getPixel method to retrieve a specified pixel of the screen, than I am converting it to RGB format to make it easier for me to code with later. The issue is no matter what is on the screen when i use the getPixel method, it always returns the same RGB values, R:0 G:0 B:0, or Black, even when there is a gray button covering up the entire screen! Here is the code package proof.of.concept

Huge negative values extracted by using getPixel() method

由 孤街醉人 提交于 2019-12-10 16:43:07
问题 I am having a problem with an image processing app I am developing (newbie here). I am trying to extract the value of specific pixels by using the getPixel() method. I am having a problem though. The number I get from this method is a huge negative number, something like -1298383. Is this normal? How can I fix it? Thanks. 回答1: I'm not an expert, but to me it looks like you are getting the hexadecimal value. Perhaps you want something more understandable like the value of each RGB layer. To

How to get pixels of an image in res folder of an android project

由 偶尔善良 提交于 2019-12-08 06:45:56
问题 new to android. I don't think any of the questions on here are the same as mine. I have images loaded into my res folder. I put them into a drawable folder. How can I get the pixels of an image named bb.png in the res.drawable folder? I will need a simple explanation on how to get the image file into a variable, and what 'getPixel(...)' command I will need to use. I don't need to display the image, just get the pixel array from it, and check if the pixel is black or white. Any help is

C# How do I convert my get GetPixel / SetPixel color processing to Lockbits?

由 落花浮王杯 提交于 2019-12-07 19:07:54
问题 EDIT: I deeply appreciate the replies. What I need more than anything here is sample code for what I do with the few lines of code in the nested loop, since that's what works right in GetPixel/SetPixel, but also what I can't get to work right using Lockbits. Thank you I'm trying to convert my image processing filters from GetPixel / SetPixel to Lockbits, to improve processing time. I have seen Lockbits tutorials here on Stack Overflow, MSDN, and other sites as well, but I'm doing something

C# get pixel color from another window

由 我是研究僧i 提交于 2019-12-07 17:26:47
问题 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)

C# How do I convert my get GetPixel / SetPixel color processing to Lockbits?

由 半世苍凉 提交于 2019-12-06 09:58:38
EDIT: I deeply appreciate the replies. What I need more than anything here is sample code for what I do with the few lines of code in the nested loop, since that's what works right in GetPixel/SetPixel, but also what I can't get to work right using Lockbits. Thank you I'm trying to convert my image processing filters from GetPixel / SetPixel to Lockbits, to improve processing time. I have seen Lockbits tutorials here on Stack Overflow, MSDN, and other sites as well, but I'm doing something wrong. I'm starting with an exceedingly simple filter, which simply reduces green to create a red and
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