I come straight to the point without going too far. I need to scan all the pixels of a generic image and for each pixel derive the RGB components. I started with the following function that performs its task very good and returns 3 array (R, G, B) with the different values, but unfortunately is too slow.
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I am working on a project related to saving an image captured from a scannner in a folder and in the database. The scan performs ok but when I save the image on disk and the path in the database I get the following error
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How I can use scanner to scan an image and put it in PictureBox using VB.NET
View 4 RepliesI'm trying to make a -what i thought would be simple app.My intention was to build program that:1) i'd provide a grayscale image2) the program would count the black pixels the grey pixels the more grey pixels etc. (the hue) and the white3) would make the percentage sum of all pixels, that is: 300.000 black pixels (rgb 0 0 0) etc. given that 0 is the black, 100 the white. e.g a simple grayscale image is 55.2 white
This was my way and i don't think that is useful:
First of a button to convert the image to greyscale:
Dim bm as new Bitmap(source.Width,source.Height)
Dim x
Dim y
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Secondly, -and that's the stupid way- i did -or better i wanted to do- this: i put the code to dynamically create labels, each label having the colour of a pixel as background colour and as text the colour converted to rgb
The third step which i intended to do (i couldn't get pas two) was to sum up the labels etc.
How can we get the pixels of an image in a fast way?
View 1 Replieshow can i get a full code or full information how to work with image and pixels i want to work with image by pixels as integer number not as color?
View 5 RepliesI am looking to remove groups of pixels that are less than 10x10 in size. The pixels are generated from scanned fax reports and are solid black, so they should be able to weed out easily. Our fax machine is rather old, and it generates random block dots along our documents. In other words, I have several images with random solid black dots that need to be removed.
View 4 Replieswhat would be the fastest (best) way to make transparent all pixels in one image that are white on other image?
Let's say that have 2 transparent images (.png) and want to delete some portion of the first image. Pixels to be deleted (made transparent) are defined as white on the other image (some kind of deleting mask).
I need to map the location of all the back pixels in an image into some kind of structure. The program later uses the structure to select a random pixel location. It then removes the location, to prevent it being used again. The problem is, there is a huge number of black pixels (close to 40,000) so an ordinary array takes forever to search for and eliminate the "used" pixels. Is there some other "Faster" data structure?
View 3 RepliesI have an Image object. I'd like to save that image on my hard disk, using a specific resolution. As a default, the image is saved in 640X480.
View 2 RepliesI'm using Visual Basic 2006 and i'm a newbie so excuse me if my question is not complete. I basically have a picturebox, in which i am displaying an image from a webcam. Now the user clicks on two points on the image and i need to get the distance between the two points in terms of the number of pixels. I did think of and try the pythagorean theorem, but i'm confused as to what units the answer turns out in. Is it in terms of inches? or pixels? Do i need to set the Scale Mode propety to pixels to get it in pixels? And if so, is there a way to get the number of pixels per inch? Sorry for asking so many questions but i've been reading other forums and i'm confused!
View 12 RepliesOn forms size and such, is it in points or pixels? I'd assume pixels, however, it seems when i make a image that is in the same size, (i put the size as the dimensions for pixels), the image seems not the same size. I'm unsure of how big a "point" is, but i am aware of a pixel.
View 7 RepliesHow can I evaluate pixels within a Binary Image?What I have done so far is to take the image and use it's "getPixel" method and do a comparison of this pixel to black/white. But that can't be right... Can it? It's a binary image, I should be evaluating each pixel as true/false. Correct?
View 6 RepliesI'd like to check for all colors in an image. I've already came up with this:
Code:
Dim lst As New List(Of Color)
Dim img As Bitmap = System.Drawing.Bitmap.FromFile("C:image.jpg")
For x = 0 To img.Width - 1
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Unfortunately this needs to sweep through all the pixels, and it's EXTREMELY slow... method to get all colors in an image without sweeping through all pixels?
I want to programatically delete some pixels that are unused in order to reduce the image size.Can anyone tell me how to reduce the size of an image file without changing the pixels values..
View 1 Repliesi want to create image with width and height 64 and set all pixels to black
dim b as bitmap
b.width = 64
b.height = 64
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the code not working
So I got a request to update specific information on a thumb drive from my program. The idea is that the user does not have to select the drive. If you plug it in and select and option on the program, it will find the drive automatically and update some files for my specific purpose. Is there a way to automatically find a drive in a program?
View 1 RepliesAlright well, I'm sort of new to VB.NET.I want to create a scanner that scans websites from lets say google or bing.It then dumps those websites into a list/textbox. It then scans each website for a directory, and if the site says something like "test page", then it dumps THOSE into another list/textbox.
View 1 RepliesI wrote a program that can kinda of read Docx files. I can extract the text of the file and the metadata that word puts in the file not the stuff you see when you write click and go to properties. I Can extract and view that data I'm working on making the subroutine (i don't know if its an algorithm there is no math.Anyway I want this to be a forensic program where it will scan the whole hard drive and add all the docx files to a listbox. I found this code
Dim file_names As ReadOnlyCollection(Of String)
Dim directory As String = "c:"
Dim searchFor As String = "windows"
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but some folders that where hidden like $inplace they were left over from my windows 7 upgrade. they cause it to crash. is there anyway to be able to scan every folder on the PC. I tried launching the complied .exe by right clicking and hitting run as admin but it still crashed when i executed that code.
i made this class to get certain pixels from screen:
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Now i have lets say and array of pixels Example: Pixel 1 position X:100 Y:200 Red: 200 Green: 30 Blue: 40 Now i need to search all the sreen to find that pixel witout knowing its position. I need to have an output of number of results found and their position tnx.
i need to programm an application which reads the pixels from screen and then manage to read the word. The problem is the white text always changes colour slightly so when i use getpixel the value(as long) is always changing although it is always regonisably white.convert them into black and white or is there any range of values which describe the white color?
Note: This is not for violation of any rules especially because its a game programmed with java.
How do I find the color of a pixel at a certain coordinate of an image in a picturebox?
I found a bunch of tutorials but they are irrelevant and do not work for vb 2008 express.
I need to know the size of A4 paper in pixels, does anyone know this, I want to be able to print at 100,100 on a piece of paper, and it be in the exact same position as in my form.
View 5 RepliesHow to convert twips to pixels with VisualBasic 2008?There is a windows application writen by vb6 and it has a main form 1000 twips high and it is in the top position. There is an another form writen by vb 2008 and i would like to fit under the vb6 form.[code]...
View 2 Repliesis there anyway i could count the number of say Black pixels in my picturebox say i have a picture in it that has 1 black pxiel i would like to to but that to a string so i could put it in a textbox or a msgbox like this
so in RGB black would be 0-0-0 but how would i have it scan the pixtuebox and count how many pixels show up with the rgb color 0-0-0
I have been making an online role playing-game in VB2008 and inside the gameloop for the client there is some code that "smoothes" out the movement (instead of it being choppy from tile to tile.) It works pretty well but I'm having problems figuring out a math formula to get a good frame timer interval to set how fast the frames change based on how many pixels they can move per loop.Testing stuff out I found that 250ms is an ideal frame timer interval for 1.0 pixel movement per loop. If I were to double the movement step of pixels by 2 lets say (2.0 pixel step per loop) I found that the frame timer interval should be around 125ms. How can I get the frame timer interval by the movement step of pixels? In cases where the movement step can anything between 0.1 to 4.0 pixels.
View 3 RepliesI am learning VB 2008 Express Edition to solve the following issue: how do I put the color of each pixel in a table, allocate a code (from 1 to 256 in the case of a 256 colors picture) to each different colors and print these codes at the right place on a grid? A few years ago, I had a basic knowledge of VB6 but VB6 being not compatible with Windows 7, I had to install a new version, VB 2008 Express edition, version that I don't know at all!
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I'd like to verify if an image control has an image loaded . If it does , I want to unload that image (and load no image) , but if the image control has no image loaded , I want to load an image . Is it possible ?
If ImageMY.Image.Equals(Nothing) Then
ImageMY.Image = System.Drawing.Image.FromFile("C:ImageBlaBlaBla.jpg")
Else
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i have a problem with the Size in VB.Net I think the Control Size in VB.Net Is Pixels so I want to enter this size cm/inch
I want To Convert Pixels to cm/inch or cm/inch to Pixels
I m trying to move all my drive's files into h drive firstly i have added all drives in threadpool for scanning and when scanning of any drive finish (Without waiting for other drive's complete ) it will move file's to h drive but it is not working as i wanted that's why i need two threadpool - one threadpool for scanning files and second threadpool for moving file's into drive's
View 11 Replies