WPF - Get Pixel Under Using .NET (not Using GDI)?
Nov 23, 2011
I am working on a WPF application and I am looking to retrieve the color value of a pixel on the screen (the screen being the Window that my application is displaying).I have found a tutorial that shows how to do this using the gdi32 API but since this is a WPF application I am looking for a way to do this without using GDI.
I have also found an example of how to retrieve a pixel from within a picture using a CroppedBitmap; however,I'm not using an image in my application.
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Jan 30, 2009
I would like to load a GIF file, and start with the first pixel and check to see if that pixel color is closer to Black, Red, Green or Yellow, then take what ever color it closest matched to and output that color as a number, 0, 1, 2 or 3. So just for a small example a 5x4 GIF would be converted to something like this: 0112223322220111332?
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Jul 4, 2010
How do i determine the pixel width and pixel height of the largest image i can paint onto the graphics object of a printer while inside a printpage event?
Imports
System.Drawing
Class
[Code]......
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Sep 13, 2007
Is there a quick way to check the color of a pixel on the screen?
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Jul 20, 2009
during the development of my project, i've fall in the need to change the position of some forms, pixel by pixel using a timer.Now, i've checked that the movement is very fluid when form is not very heavy, when it contains few elements, but when it has a lot of elements inside, the movement becames nervous and not fluid, the movement becomes jerky.
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Jul 29, 2010
How can I find out the pixel colour of a certain point on a web browser. For instance,WebBrowser1.getPixelColor(0,0) would get the rgb colour value of pixel 0, 0.It doesn't have to be rgb it might be hsl or whatever.The web browser is showing a local web page that is hosted on a network. If there is an error then the screen goes all grey. What I want to do is, if this does happen, display an alert message like - "An error has occurred
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Apr 16, 2011
I have an empty picture box with the background colour set to the transparancy colour. How can i get the colour of the pixels within the transparant picture box so that i can create a bitmap of the transparant section of the form?
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Mar 20, 2012
I have the code below on a timer( "b" is a bitmap )
If
Not (Clipboard.GetImage
Is
Nothing)
[Code]....
The problem is that it raises the event even if the picture didn't change.
comparing the 2 images without actually comparing them pixel by pixel (too slow to do the job)?
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Dec 7, 2009
How would I use GetPixel() to get the RGB Value of a Pixel?
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Mar 6, 2012
How can i do a pixel loop?
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Sep 5, 2010
How can i get a x,y location of colored pixel in my picturebox ? so say the pixel i wanted to get was the rgb 0,0,0 for black, How would i find the black pixel and return it's x,y ?
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Oct 4, 2010
I've read all of the examples for getpixel using bitmaps. I'm not using bitmaps.
I'm drawing simple shapes to forms and pictureboxes.
I need an example of how to get the color of a pixel (x,y) for use with forms and controls.
how to get the color of a pixel (x,y) on the screen would be helpfull to.
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Feb 2, 2012
VB 6.0 had a Set Pixel function, which is not available in VB.net. using a draw ellipse function with parameters specifying a circle one pixel in diameter.The above is painfully slow.I have been drawing graphics in a Bit Map using a Set Pixel function & then copying the entire graphic from Bit Map to a Picture Box. This results in nothing seeming to happen for several seconds & then the entire graphic is displayed in the Picture Box.
The above does the job, but it would be nice to display the graphic as it is being generated pixel by pixel, which was possible using VB 6.0, Might there be a Windows 7 API which would set a pixel? Might Microsoft be considering a Set Pixel function for Picture Box graphics?
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Nov 22, 2011
Is there any function to know the location of a certain pixel.
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Aug 12, 2010
I have the following VB6 code which selects the pixels in a picture and compares them to a threshold value. I would like to convert it to VB2008, and I've attempted the following:[code]Is this the correct way of comparing the value of a pixel to a threshold value?
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Nov 27, 2011
I want to count all of red pixel in an image. This is my code :
Dim x, y, kq As Integer
Dim image1 As Bitmap
image1 = Bitmap.FromFile("D:FiberAll.bmp")
[Code]....
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Jan 13, 2008
How do i detect the color of a pixel ANYWHERE on the screen (not just in a picture or on the form). do i need a dll or something?
(politely) can someone help me write a function that returns the color of the pixel in argb?
for eg public function(x,y) as color ?
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Aug 15, 2011
I have drawn a grid in vb2008 so that each rectangle represents a 15 min period of a day. Time slots are shown by filling in the grid in different colours using the draw rectangle method. No problem so far. Now I want to discover the colour of any given part of the grid to prevent an overdraw.
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Dec 14, 2011
1. Let's say I have two buttons, one that draws a random circle (random size and position) and one that draws a random rectangle. How do I manage that?
2. How can I find the color of a specified pixel?
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Apr 17, 2009
i am working on a project in vb.net 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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Oct 8, 2009
I am creating a custom tooltip label. My problem is auto resizing it (particularly height).The thing to note here is that the label i am using is an infragistics label, and i can have different fonts and formatting inside the label which means i cant just measure the text height based on the font because the label will contain multiple fonts.The only thing i can come up with is to make the label the height of the screen, and then perform a loop which scans the colour of each row of pixels starting from the bottom, decreasing the label height each time until it finds some pixels which <> the backcolor of the label (which would indicate that there is some text there).This is the only reliable way i can think of to make this happen, but im having trouble finding out just how exactly to get the color of the pixel at the given point.I did find one method of getting the pixel color, but the problem was that it when i requested it in the form_load it didnt return the right color because the screen wasn't painted (i guess).
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Feb 24, 2011
how can i get the actual pixel coordinates, in the pb_mousemove event, from an image with sizemode stretched or centered or zoomed?
the e.location property returns the location in the picturebox, but i need to compensate for scale + the left + top offset of the image.
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May 26, 2012
I would like to know if it is possible to get the dimension in pixel of a form without the title bar and the border.
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Feb 9, 2011
The title basically states it. Is there a possible way to do this?
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Apr 5, 2010
How would i get the RGB color of the pixel the curser is on?Attributor 2.0
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Jun 25, 2010
I've recently been working on some VB.NET programs, grab the value of the color of a pixel on my screen(Out of my WIN32 Application).
I need this so I can make a little bot that automatically pushes buttons for a online game called "JamLegends"(http:jamlegends.com). Its kind of like Rock Band, and if I can grab the color, then I can simply used 'sendkeys' to press buttons to make the bot work.
Edit: This is for a project in school. We need to make something that will make a program that will make something easier to work with or use(In my case, JamLegends). I have nothing to work with, I've researched a bit but I found nothing that can grab pixel color values.
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May 24, 2009
I need to know how to decode GIF pixel blocks. The example block that they are using look like this "00 51 FC 1B 28 70 A0 C1 83 01 01" and i cant under stand how they converts that to "100 028 0FF 103 102 103 106 107 101" !?!?I mean... 00 51 FC 1B 28 70 A0 C1 83 01 01 === 00000000 01010001 11111100 00011011 00101000 01110000 10100000 11000001 10000011 00000001 00000001 if I read that like 9bit each it no way I get this result != "100 028 0FF 103 102 103 106 107 101" ?
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Aug 18, 2009
Now I have inserted a picturebox and now I have to get the color value of a pixel of the image which I load to it.
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Jul 7, 2009
I was wondering if their is a way to set my program to search for a certian image or a set of pixels on the screen every 5 seconds, and if the specific image is on the screen, click it.
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Nov 17, 2011
I'm trying to create a program using Visual Basic .NET 2010 that alters the use of my media keys - Volume up, Volume down, Play, etc. All of the example I have found don't seem to compile quite correctly in 2010. Don't get me wrong they run fine and look exactly as specified but the problem is that the form cannot be edited because it claims the designer code is ill-formatted or something along the lines of that.
Can anybody possibly spare a project or form that has perpixel alpha transperancy?The only thing i want to do is show an overlayed png that has an alpha channel, on the desktop. The form border style will most certainly be "NoBorder"
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