VS 2010 - Bitmap Pixels Per Inch/Centimeter?
Mar 10, 2011
I have scanned a few img's on 600 DPI. When i load them into a Bitmap class They have Vertical and Horizontal Resolution of 96 PPI To my calculation that is very close to 38 Pixels per centimeter. Now the image that I scanned is 4.5 Centimeter (1.77165354 Inch) In Diameter but When I measure It the 4.5 cm img is close to 1080 pixel in Diameter which is 240 Pixels/Centimeter (609.6 Pixels/inch) What is the correct way to get the actual Pixels per inch/centimeter from a bitmap or was it set incorrectly by my scanner ?
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Feb 28, 2009
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
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Aug 31, 2011
I have a picturebox that loads an image then resizes it and saves it which I know how to do in code
dim iBit as new Bitmap = picturebox1.image, picturebox1.width, picturebox1.height
What I want to do is be able to specify the Pixels Per Inch for the resolution.
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Aug 28, 2009
Was just wondering if there is a way to quickly clear all pixels in a bitmap without creating a new one?
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Jul 16, 2010
I have to know how to set system resolution of all tools in forms, which i using for my application.
I attached two screen shots. When i work my application with my system, form window and their tools placed correctly with my monitor fit(15 inch monitor).
But when i work my application in 21 inch monitor, all tools re arranged and
not in format. post me the code to set resolution as per system??
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Apr 19, 2009
My goal is to iterate through each pixel determining whether it is black or white. Ideally I want to do this one row at a time (so I can count the number of black pixels in each row). This is a bitonal image.I tried to get it started, but I don't understand what value(s) I'm supposed to be polling for. The following code takes a stab at it (i.e. makes a guess as to what value I'm supposed to check) and then outputs that value to a textfile.When I read the textfile, though, it doesn't look like anything useful.This code is an attempted modification of some code found in a CodeProject article.[code]
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Feb 13, 2012
i mostly use C and assembly, but i thought i would give VB.NET a shot. i used to use VB6 all the time, so wanted to see how different this is. in VB2010, i'm trying to modify the pixels of a Bitmap object and then make it show up in a PictureBox on the form. i get no errors, but this code does not show the new bitmap after it runs.."disp" is the name of the PictureBox on the form.[code]
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Feb 14, 2012
Pretty self-explanatory question. I'm trying to see if I can do sprite animation in Visual Basic and, while I can use a Graphics object to translate a bitmap down a few pixels, I have absolutely no idea how to erase the bitmap drawn in its former position. Is there any way to erase the old image before the new image is drawn onto the form?
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Feb 19, 2006
I've been trying to mess around with image recognition in C# for some time now. But to do that, I need acces to all the pixels in the bitmap individually. At the moment, I'm using getPixel and setPixel. It works, but it's VERY slow. Is there any faster way to acces pixels in a bitmap? Unsafe code maybe?
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Oct 9, 2009
I need to write a code to find identical adjacent pixels in a bitmap image. It should work as the 'magical wand' in Photoshop. My images are always black and white (white background with car parts drawed in black). Given the x,y coordinate for a single black pixel in the whole image, the code should find (and paint with another color, say red) all other black pixels that are linked to that one, and so on, until all linked black points will be painted in red.
[Code]...
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Aug 12, 2011
I need to write a code to find identical adjacent pixels in a bitmap image. It should work as the 'magical wand' in Photoshop.My images are always black and white (white background with car parts drawed in black). Given the x,y coordinate for a single black pixel in the whole image, the code should find (and paint with another color, say red) all other black pixels that are linked to that one, and so on, until all linked black points will be painted in red.This way, suppose that I have an image with 4 car parts drawed, then if I give the x,y coordinate of a black pixel, just THAT part to whose the black pixel belongs to should be painted in red. All other parts will remain black. Does it make sense?At the end, there are two pictures (before and after) to help understanding what I need to do to the images.I tried a simple 8-pixel adjacent approach for every pixel (starting on initial coordinate) but it turns out into a very stupid and endless looping algorhitm.
Code:
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
[code]....
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Jan 22, 2011
I've googled and binged my browser to an inch of it's life, but i'm still no nearer to an answer for this, so I'd be grateful for some advice. Mainly with the syntax, but knowing me the whole concept is wrong!I have a textbox. When user enters a string and presses enter, I want the following to happen.
I'm struggling with 3 and 4 and 7
1. Check the string is not more than 13 characters, if so trim the last characters off to make 13
2. Find if the first character of the string is a digit or a letter
3. Convert the string into an array of INT
[Code]...
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Jul 27, 2009
I'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
[CODE]...
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.
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Jun 28, 2011
I'm having some trouble with getting my code to scan a specific pixel on my screen for a specific color, and then react when the right color appears. Here's what I'm trying to do:
I have 3 hotkeys. Each hotkey starts a scan for a specific color (lets say #244FA3" ect.) and all 3 searches is looking/searcing for the colors at the same pixel/spot on the screen (lets say x=600, y=700).
Each of the seaches has its individual timer, so the code is actually the same in each timer - it only needs to search for a different color. Each timer is activated by a hotkey.
I just can't figure out how to search for the color at the specific pixel, and then react when the color is found. And it should be fairly fast (search like every 0.1 second after it's activated)
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Feb 3, 2012
I have a title (in one line) that can have different lengths. I need to print this title on A4 landscape - page ( draw string in print page event), but always it should be located in the middle of the page, regardless of length. If I want to determine the exact location I have to calculate the length of the string in pixels. Or maybe there is a better way to center the string on page? How can I do it?
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Sep 30, 2011
On 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.
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Jul 3, 2011
I'm using Bitmap to show picture box like slideshow using Timer. For each timer interval, I've to go for new instance of Bitmap, there System memory increases to 1MB, How to resolve this, 'BG is picture box
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tic Dim img As Bitmap
img = New Bitmap(System.Drawing.Bitmap.FromFile(FileIO.FileSystem.GetFiles
[CODE]...
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Feb 21, 2011
I have desiged some checks in inch.Now,i want to print check.I must know the printer's DPI(Dots Per Inch).
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Dec 15, 2010
I'm trying to use a ToolTip directly to a Bitmap Object (System.Drawing.Bitmap), aparently I can't do this because Bitmap isnt a Windows Control.
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Mar 23, 2012
I need to convert between Drawing.Font.Size (float, ?) and WPF FontSize (double, WPF pixels).Finally, I decided to store in the database the fontSize in inch...How can I convert the GDI FontSize to inch and the WPF FontSize to inch?
sizeInInch = wpfFontSize / 96
sizeInInch = gdiFontSize / ?
Can I use something DPI independent? Maybe System.Windows.FontSizeConverter?I need to convert to something, that will allow me to switch multiple time between WPF and GDI without changing the "real value". Each division and following multiplication will accumulate errors...
FontSizeConverter does a ConvertTo, but I don't understand to use it:
myUniversalFontSize = (double)(myFontSizeConverter.ConvertFrom(
gdiFont.SizeInPoints.ToString() + "pt"))
will transform my gdiFont size in ...? WPF Pixels?How now should I convert back that value to GDI?
gdiFont.SizeInPoints = myUniversalFontSize / 96 * 72???
Can I use in the second example the myFontSizeConverter too?
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Dec 22, 2010
Is there any prebuilt items to roundup a number to set fraction size or do I need to build a routine to do this? If I have to build this any thoughts on the way to go about it? I was thinking I need to strip the decimal places and then compare them to a dataset of numbers a make a choice?
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Sep 17, 2011
how can i create a monochrome bitmap from a semi transparent bitmap in vb.net? the bmp is for a transparency mask image for an icon i'm trying to create with the CreateIconIndirect API function.
i'm using vb2008 .Net3.5, but i would prefer an answer that would also work in vb2005
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Apr 4, 2010
Imports System.Drawing
Imports System.Drawing.Imaging
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code] ......
I am using this, however I get a GDI+ Unhandled Error.
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Jun 15, 2012
I have 6 bitmaps, all the same size. Their ImageFormat is Format32bppPArgb. Sometimes when I try to resize the bitmaps I get the Out of Memory message. This doesn't happen all the time, only after about six or seven resizes.In Task Manager, the program's memory use never goes above 800k.Is there a way to resize a Bitmap without creating a new one?If I have to recreate the Bitmap, do I need to dispose the current one (or set it to Nothing)?
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May 20, 2012
I'm looking to make a program that would capture your whole screen, then have the picture display on the screen (simulating a frozen screen) to where the person handling the program could select a partial segment of the screen with their mouse and then save to a folder.
1. I have no idea how to go by doing this
2. My form is constantly minimized, so I have to do it without MouseDown on the form and whatnot.
How would I go by doing this?
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Mar 17, 2012
I am trying to make an application that can do effects to images but the problem is when I use large photos its takes a very very long time. I am reading it per pixel with bitmap's GetPixel and SetPixel methods. Is there anyway to make this process faster without using C# or C++?
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Jul 18, 2011
I want to create small 1,5 x 1 inch image/logo spinning in the upper right corner of my app.I have tried to find a solution reading posts and tutorials on OpenGL, DirectX, GUI+. how to create this using vb.net (using vs2008)?Here is a link to a spinning logo (forget the program, just the logo), like I want to create. I have a .jpg image that I want to use.[URL]
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Feb 5, 2011
I'm trying to create a DLL with some useful methods and subs for my use. But when I tried declaring an object for Form or using the keyword Screen, Bitmap, etc.. gives an error saying that "The type 'Screen' is not defined" and like that..
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Jul 19, 2011
I was wondering how to draw characters/string on a bitmap.For example: I have created a new Bitmap with resolution of 200x200. Now using Graphics.DrawString(), I have to draw text. I can draw text. But my question is, I want to fill it the image with that string.Say, the text be "abc".So, the output would look like this for 200x200 bitmap (assumption):
[Code]...
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Jan 22, 2011
In my user control you can load an image into a Bitmap type, it then displays the image onto the usercontrol. However, it works fine with .gif format images, but when i use .png it seems to make the image bigger than what it is.
Private imgPicture As Bitmap
Public Property Picture As Bitmap
Get
[Code]....
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