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 donīt understand anything . Does anyone know how it works or how to make my code run faster?
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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.
View 13 RepliesI 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.
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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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
View 2 Repliesits 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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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.
Here's my
Public Class Form1
Dim imgImage As Bitmap
Dim clrOld As Color
Dim clrNew As Color
Dim blnChange
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I receive these error:
"SetPixel is not supported for images with indexed pixel formats."
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."
View 5 RepliesI'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
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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?
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
[code].....
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?
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...
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
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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.
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....
View 15 Replies[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.
View 28 RepliesWhich would be better to use if I want to find one pixel?
View 2 RepliesIm 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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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()
Try
Dim queue1 As Integer = GetPixel(GetDC(0), 40, 573)
Dim queue2 As Integer = GetPixel(GetDC(0), 140, 573)
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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.
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.
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.
View 1 RepliesI 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.
Try
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
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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.
Try
Dim dc As IntPtr
Dim screencolor As Integer
If myHandle <> IntPtr.Zero Then
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in Directx Full Screen Game GetPixel Function Not Working (#000000)
View 2 Replieshow 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
View 10 RepliesYou'd think both are the same. But maybe it's the compiler that Microsoft has used, but I've noticed that when compiling two very small programs, identical logic. VB.NET uses more IL instructions.Is it true than that c# must be faster, if only because its compiler is smarter.
View 6 RepliesPossible Duplicate: Is C# faster than VB.NET? Which one is faster, C# or Vb.net ?
View 2 RepliesA long time a agp I settled into a listview as an indicating device. I do not use pictorial modes or graphics. Just listing and multicolumn listing.I am also a performance bug and I have written realtime monitors for monitoring cpu activity in real-time and normally rum them starting at bootime. Lately I have found that the listview throws away time. In a tight loop, the list view does not take all cpu time available and the listview is relatively slow.
Does anyone know of a control like the list views only it's faster? Multi-colored and multi-columned are musts.
I have a simple application, a form with two datepicker( Datepicker1 is for startsearchdate, while datepicker2 is endsearchdate) to filter out any record that not in the range. The source of the record is readed from a rtf file.The record is in format as showm below.[code]...
View 9 RepliesMy co-worker said that in a previous interview, he learned that foreach is faster in VB.Net than c#'s foreach. He was told that this was because both have different CLR implementation.
Coming from a C++ perspective, I'm curious on why this is and I was told that I need to read up on CLR first. Googling foreach and CLR doesn't help me understand.
Does anyone have a good explanation on why foreach is faster in VB.Net than in c#? Or was my co-worker misinformed?
