How To Use Getpixel And Setpixel

May 18, 2010

I have a icon maker program. I have two pictureboxes pic1 and pic2 and a open image button. I need a code that will if the pic1.image color has any red in it, it will take that red and turn it into the desired color. I know you can use getpixel and setpixel but I don't know how to use these.


Faster Than Getpixel Setpixel VB?

May 23, 2012

I worked in a role and functioning properly. The problem is that it is a bit slow for use in many images would be very slow. I read online that with  stride and scan0 and working in memory with buffer can be made faster, but i don´t understand anything . Does anyone know how it works or how to make my code run faster?


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Picture GetPixel And SetPixel: Include Alpha?

Jan 6, 2011

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 & SetPixel.Both images have the same size. Both have transparent areas.

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Nevermore PictureBox.SetPixel?

Nov 30, 2010

I have been using Bitmap.SetPixel & copying the entire bitmap to a picture box after the entire graphic has been drawn. When running debug within the IDE, this takes less than 10 seconds, while DrawEllipse or Rectangle takes almost 4 minutes.I will be using the more time consuming method for my next application, since that application requires seeing points set in Picture Box as they are generated

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VS 2008 SetPixel Not Working At All

Apr 3, 2009

its the first time im trying to use SetPixel , it doesn't seem to work at all,
im trying to draw anywhere in the screen (where the mouse is), there must be something im doing wrong


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Use Setpixel Color Value For 3 Digit Hexadecimal?

May 21, 2011

I'm having 3 digit hexadecimal value, example "ccc" How can I use this value for setpixel function. 

out.SetPixel(j, k, Color.FromArgb(255, Val("&H" &  "ccc"), Val("&H" & "ccc"), Val("&H" & "ccc")))

It gives error, How can I use 3 digit Hex value.

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VB 2010 - SetPixel ID Not Supported For Indexed Images

Dec 1, 2011

Here's my
Public Class Form1
Dim imgImage As Bitmap
Dim clrOld As Color
Dim clrNew As Color
Dim blnChange
[Code] .....

I receive these error:
"SetPixel is not supported for images with indexed pixel formats."

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VS 2010 SetPixel Is Not Supported For Images With Indexed Pixel Formats?

Mar 7, 2011

I am loading an image on picturebox, then trying to paint some particular pixel but it does not work for the tif image that I have. I got the following error message "SetPixel is not supported for images with indexed pixel formats."

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GetPixel API On Picturebox?

Aug 6, 2009

I'm having trouble getting the pixels of a Picturebox. My code is as follows:

Option Strict Off
Option Explicit On
Imports VB = Microsoft.VisualBasic
Imports System.Runtime.InteropServices


The program is supposed to load a picture, and then get each every pixel on the first line, adding the HEX color code and a "," to the richtextbox. At the last pixel of each line, it adds a ";" and skips to the next line, repeating the process until all processes are read. I've done this successfully by creating a new bitmap and using the .GetPixel from that, but that is terribly slow. Will this be faster? If not, is there any other API I could use that is faster?

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Getpixel Is Not Working?

Nov 28, 2010

Look at this code, it's so simple, yet I can't manage to get it to workon the top of form1 is

Option Strict On
Imports System.Drawing
Imports System.Drawing.Drawing2D


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How To 'getpixel' For 32 Bit Float

May 18, 2010

My program works through each cell in a raster bitmap loooking at the r g b values. Actually I'm just working with greyscale so r = g = b. I use the get pixel method to return the 8 bit value of each pixel (0 - 255). However I'm now working with a single channel 32 bit float bitmap. I can't load it into VB. I tried Dim myBitmap As New Bitmap(OpenFileDialog1.FileName) but this fails with an unspecified error when trying to open a 32 bit tiff.

The question is: which graphics format will allow me to load a 32bit bitmap into VB, and if I succeed will the getpixel method return 32bit float results for the greyscale level for each pixel?

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VS 2010 Use GetPixel In A Different Way?

Feb 28, 2012

Is it possible to use GetPixel in a different way? I want to use it like:

'If GetPixel(x,y) = COLOR Then
Loop Until GetPixel(x,y) = DIFFERENT COLOR
Something like that...

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Why Is It That The Cint() Is Only Used For Pic.GetPixel(X,Y).R) And Not For The Others

Jul 22, 2011

i need some help on explaining to me whats going on in the code below. Basically, the code below is used to convert a bitmap image to grayscale level (black and white).

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim pic As Bitmap
pic = picVisible.Image
Dim X As Integer


what i dont understand is the part;

color = (CInt(pic.GetPixel(X, Y).R) + pic.GetPixel(X, Y).G + pic.GetPixel(X, Y).B) / 3

why is it that the Cint() is only used for pic.GetPixel(X,Y).R) and not for the others ? Any Image processing expert that can help explain this ?

Note: The code works well and manages to convert an image into its grayscale.

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GetPixel Color From A Picturebox?

Apr 17, 2009

i am working on a project in 2003 and i want to get the color of a pixel when i click on the image loaded in the picturebox.i ve tried anything but nothing seems to work....

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Something Faster Than Bitmap.getpixel?

Apr 24, 2010

What I'm trying to do is iterate through each pixel in a bitmap, and get the color value of each pixel.I've tried using .getpixel, but it's fairly slow. On a 640x480 image, it takes roughly .35 seconds to go through it. Which can add up if doing many pictures.


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VS 2010 GetPixel Not Working

Mar 3, 2012

[code]Well, the first GetPixel works fine, it sets textbox2 to yellow if the pixel is ofund and textbox1 says green. But, the second GetPixel doesn't work. The coordinate are correct and the color is also, but I never receive the msgbox.

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VS 2010 LockBits Or GetPixel?

May 30, 2012

Which would be better to use if I want to find one pixel?

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Getpixel And Mouse Click Program?

Mar 13, 2009

Im trying to make a program that will automatically send a left mouse click on the current mouse position using a getpixel trigger. The one i made will wait for the pixel color to change and it will trigger the next timer to monitor if an indicator hits the middle of the bar.

This is the example of the bar waiting for a color change:

This is the example of the bar when the indicator comes out


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Memory Leak Using GetPixel/GetDC In VB?

Apr 6, 2012

I have a timer that among other things, checks 5 spots on the screen for a color change. My program monitors a phone system app and checks to see if there is a new incoming phone call from any of 5 buttons. I'm using the following code based on another question I had posted. Monitor an area of the screen for a certain color in Visual Basic

Private Function CheckforCall()
Dim queue1 As Integer = GetPixel(GetDC(0), 40, 573)
Dim queue2 As Integer = GetPixel(GetDC(0), 140, 573)


Using this code, GDI Objects skyrockets very quickly and within short order, throws an OutOfMemory exception. I'm assuming I'm not releasing the DC properly, but I can't seem to find any other way to do it.

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Find The Colors Of Pixels Using GetPixel(x,y) With Bitmaps?

Oct 12, 2010

I'm trying to find the colors of pixels using GetPixel(x,y) with bitmaps.

I understand how to use it and it works.

When I use .ToString I get the string version of the color.

Now when I use .ToArgb I get a negative number and the colors are backwards?

16777215 should be white and 0 should be black.

This is an example of some results:

-16273900 is showing close to black and -32567 is showing close to white.

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Getpixel + Printwindow : Getting A Pixel From A Program That Is Not Focused?

Jul 21, 2009

what i have been trying to get to work is getting a pixel from a program that is not focused (so minimized). I tried Getpixel but only got it to work when the window is active(focus). It seems it only works for active window.Then i thought making a temperately screenshot of the program and get the pixel. I came across PrintWindow. Right now im searching to make a temperately screenshot of a minimized program and read the pixels of it. So far i had no success.

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VS 2008 - GetPixel Moves Mouse To Wrong Color

Dec 5, 2009

I get no compile/debug errors. When I opened it, and tested it on this site, it doesnt move the mouse to 255, 0, 0 (red). it moves it to 128-128-0.

Dim dc As IntPtr
Dim screencolor As Integer
If myHandle <> IntPtr.Zero Then
dc = GetDC(myHandle)
Dim XPos As Integer = Cursor.Position.X
Dim YPos As Integer = Cursor.Position.Y
[Code] .....

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VS 2008 GetPixel Moves Mouse To Wrong Color?

Apr 23, 2010

I get no compile/debug errors. When I opened it, and tested it on this site, it doesnt move the mouse to 255, 0, 0 (red). it moves it to 128-128-0.

Dim dc As IntPtr
Dim screencolor As Integer
If myHandle <> IntPtr.Zero Then


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VS 2008 In Directx Full Screen Game GetPixel

Aug 20, 2010

in Directx Full Screen Game GetPixel Function Not Working (#000000)

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Interface And Graphics :: Get The General Color Based On What Is Returned From Bitmap.GetPixel()?

Aug 28, 2009

how can i get the general color based on what is returned from Bitmap.GetPixel()? Like i want all shades of blue to just be blue, and so on

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