.net - GDI+ Image Conversion From Metafile To JPEG/GIF Results In Black Background?
Jul 8, 2009
So i am converting a metafile (EMF to be exact) to a jpeg or gif (doesn't matter as long as it's compatible with browsers) and when I do the conversion, all of the transparent pixels turn black. I have no idea how to do this in GDI+ but here is the method I am using to save the file:
Dim Img As System.Drawing.Imaging.Metafile = New System.Drawing.Imaging.Metafile(stream)
Img.Save(Server.MapPath("/FileName.gif"), System.Drawing.Imaging.ImageFormat.Gif)
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Nov 16, 2010
What am i doing wrong on this code? im trying to get my form into a jpeg picture, but everytime it only saves a black screen of what im doing
Code:
Private Shared Function BitBlt(ByVal hdcDest As IntPtr, ByVal nXDest As Integer, _
ByVal nYDest As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, _
ByVal hdcSrc As IntPtr, ByVal nXSrc As Integer, ByVal nYSrc As Integer, ByVal _
[Code].....
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Mar 20, 2011
i need a windows program (on visual basic express) to convert a list of images to black and white. then to send it to a microcontroller via ethernet. i dont know anything about vb at the moment so simple explanations and code would be great. in the meantime i will try learning vb. but i need this program quick.
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Jun 5, 2011
Im looking for a class or code in VB.NET that can convert a black and white image in JPEG format to a grayscale TIFF format.
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Jan 16, 2010
I am trying to assign a button to let a resource ( JPEG image ) become the background of my form. But instead, the background becomes blank. Here is what I wrote:
Public Class Choose_Background
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.BackgroundImage = My_Project.My.Resources.african_lion
[code]....
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Dec 7, 2010
I have a little piece of code which saves a certain Bitmap to a JPG image. The Bitmap is "composed like this" ( Ppiechart is a picturebox):[code]So After it is declared I start to do some drawing on this bitmap. And then I want to save it like this:[code]So this saves the image. But the problem is that the background of the image turns black when I open the file on my PC.The background of the Bitmap in the program itself is white. So does anybody have an idea what may cause this? Do I have to declare a color for the "mybitmap"?
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May 23, 2010
I want to make my system is the only system in the windows the user Can use it like games
since i want to make the background of my system is Black [code]...
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Dec 28, 2010
'm working on an Image Encrypting software which reads out all the pixels of an image and then relocating the pixels in some way.
My Code is as below
Dim Img As New Bitmap(tbEpath.Text)
Dim ImgSize As Integer = Img.Width * Img.Height
Dim Pixels(Img.Width, Img.Height) As Color
[code]....
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Apr 27, 2006
when i click on a comboboxcell in a datagridview, the background turns black . . .
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Feb 8, 2009
I have a form with transparent background (using png file).All controls placed over it becomes black at start then they change there color and comes to there original state on MouseHover. Its not the transparency keys problems since the transparency key color is different that controls back color. What can be the problem?
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Mar 16, 2009
how i can convert gif image to jpeg image using vb?
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Feb 17, 2012
I need to get a jpeg image from file system, feed it to DrawImage method for resizing and then save the result to a varbinary(MAX) field in a SQL Server table. How can I do the conversion from file system to image (from DrawImage method) to the varbinary(MAX)
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Sep 27, 2009
how to save a jpeg image to the database. I am using fileopendialog to upload the image to the picturebox. This works fine but I now need to save this image back to the database. I am using an Oracle database (11g) and the image datatype is declared as a blob.
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Jan 6, 2011
I have created a form that enables the user to add details about a bicycle, the functionality of it is fine. I have thought about allowing the user to write a jpeg image that relates to the ike being added and then at a later date when they want to search for this bike the image is also read to the same form as the details of the bike on the search form.[URL]..
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Mar 15, 2010
Does anybody know if there is an application that allows us to embed an exe file into word doc, image(JPEG), or PDF.
Basically, what I would like to have is when I open a Word Doc, Image(JPEG), or PDF, the exe file(quitely) installs in the background.
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Mar 25, 2009
I'm reading a folder to assess the width x height of jpeg's, to classify them in various ways. Opening each as a bitmap and reading the bitmap width and height works but of course is laborious and very slow .... I've read various JPEG file format papers but retrieving the image pixel width and height seems none too obvious. Is there a logical way in VB to get this info quickly? My jpeg's are bog-standard ones made using VB's "Bmap.Save(Fname, ImageFormat.Jpeg)".
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Apr 2, 2011
I am trying to make everything in my image black that is not white. I am having a little trouble doing so though.
[Code]...
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Feb 18, 2011
Background of form: black
background of char, bombs and shrooms: transparent
picbox behind char, bombs and shrooms is regular (marioland)
How can i fix it so the transparent parts dont see form as background but marioland as background?
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Oct 30, 2009
I have a routine that creates a report which includes text and graphics. When I print to a PDF or printer the output looks great. When I draw the report on an image to save as a PNG, GIF, JPEG, etc. it does not look as good and I understand that is related to the 96 dpi native resolution. However, I made some modifications, and even though the graphics part of the image looks better, the text does not look as good as the PDF. I am creating the image using 300 dpi and text rendering is set at the highest quality.
[Code]...
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Nov 9, 2009
Alright, say I've made an animation in photoshop and exported it as a JPEG. I want to know if it's possible to change which frame of the animation the image will show. An example is if I made an image with 10 layers, and I want the 5th layer to show in a picturebox, how can I achieve this?
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Jan 29, 2010
I have created a form in Visual Basic with two buttons, a PictureBox and a TextBox. I made the first button to load an image from my hard disk and show it in the PictureBox.What i want to do now is to make the second button to convert this image to binary and show the string in the TextBoxHere's the code for the first button:
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May 21, 2011
This is my code to get screen captures every certain interval of time. But each image is being around 150kb and I want to make it smaller. what matters is the image size in kb to be around 70kb ( almost the half ) .
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim ScreenSize As Size = New Size(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
Dim screenGrab As New Bitmap(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
[code]....
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Apr 21, 2009
where can i find a jpeg image with adaptive binary arithmetic coding?if you have a image of that, please sent it to me.
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Sep 20, 2009
I want to create a sort of slide show program. I want to get a folder full of images (bmp and jpeg file types) and have this program display it really quickly and then refresh to show another randome image really quickly. Then I want it to look into another folder and grab an image file from there that will be the last image and stays up. What I want to know is how will i go about getting the program to get the random image and then how will I get it to refresh instantly?
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Nov 19, 2009
I have pictures of each employee stored in SQL database with Image database.
Select pic from empimages where emp_ID=10
give the picture of that employee in binary format.
How do I create a physical jpeg in C:images folder based on the above query in vb.net.
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Jun 20, 2009
Is there a way to convert an Image to Black and white before displaying it in a PictureBox? Or is there a way to make a PictureBox display color images in black and white?
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Mar 17, 2011
I want to draw a rectangle on image where color pixel of image is black
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Jul 10, 2009
The code:
strSql = "insert into table2 (transactiondate) values ('" & transactiondate & "')"
seems to be giving me the runtime error:
[code].....
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Oct 13, 2010
I am having trouble displaying my results from a temperature conversion program. I am sure it is something simple that I have overlooked. Here is the code.
[Code]...
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Jun 21, 2012
i 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
[code]....
the code not working
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