Hi all, I have a Bitmap that I'm ready to stream back to my aspx page. I implemented this in a HTTPHandler. The issue is the default image name is gerneated using the HttpHandler name. How should I use Bitmap.Save() method that takes a Resoponse.OutputStream and specifiy a file name at t...more >>

Below is what I was doing similiar to rotating an Ellipse, but I also want to rotate a line in a user control and dont quite understand how to do this? Jason //Create pen. Pen blackPen = new Pen(Color.Black, 3); //Graphics path GraphicsPath graphPath = new GraphicsPath(); // ...more >>

Why this code fails and what is the solution ? PointF pntA, PointF pntB PointF center pntA = pntA - center; pntB = pntB - center; The error is that i cannot use the '-' operand between pointF. How to do that ? Thanks ...more >>

Hi I am using Bob Powell's approach for converting images to Format1bppIndexed. This process is taking more then 2 minutes for 7kb image. The final image thats created is right but the process takes very long. Can someone tell me if the conversion really takes that long or if I am do...more >>

I am using GDI+ to load a tiff image and write a string to it and save the tiff image to another file. I can save the image with only LZW Compression and not abel to save with CCITT4 compression. If I use CCITT4 compression I get an invalid paramter error when saving file. The file saved...more >>

Okay, it seems apparent to me that GDI+ does not use any hardware acceleration (despite Microsoft's original intentions). So the question is, how do I get graphics acceleration in my .Net application? Does the use of BitBlt guarantee acceleration? Can someone tell me what API calls will get a...more >>

I saw in MSDN EnumerateMetafile is called in OnPaint method of a Form control. How to make the following code works? Can anyone help? Graphics g = this.CreateGraphics(); Graphics.EnumerateMetafileProc metafileDelegate = new Graphics.EnumerateMetafileProc(MetafileCallback); ...more >>

Hi All, I want some charting functionality in my ASP.NET application. I want to show a multiple bar on my web page. It's based on down time of different servers. like server1: down betn 4 AM to 5 AM and 6 PM to 7 PM server2: down betn 7 AM to 7:30 AM server3: down betn 3 AM to 5 AM and 2 ...more >>

I am saving off 1 bit depth 150X150 dpi images and trying to view them with Imagemagick. The problem is some of the images are inverted meaning the black shows as white and the white shows as black. Anyone have any idea why this would occur? Thanks, Curtis ...more >>

I've used the Scale Method to implement a zoomable interface which is working really nicely. However when new controls are added to the interface they go to their default size, creating some weird effects. Before I start adding complex operations to remember what scale they should be added a...more >>

Hi everyone! I have a question about GDI+. I hope this is the right group for it. I'm building a control in C#. This is approximately what is bothering me. My control has something like this: float deltaY = 0; // the onPaint handler of my control protected override void OnPaint(PaintEve...more >>

I am attempting to render text onto a Bitmap by using GDI+ (.net 2.0) MeasureString/DrawString methods. Depending on the text length and Font object (i.e. Font Family and Font Size), DrawString won't draw the string based on the size that MeasureString returns. It appears that MeasureString do...more >>

If I have a Bitmap with a 24bpp format that I have loaded (or any pixleformat for that matter) and want to convert it to a 1bpp Bitmap is there some way to to do this besides iterating thru the bitmap data myself pixel by pixel? I realize that any method supplied will "estimate" whether the ...more >>

Hi all. I hope I’m asking my question in the right place (please direct me to a better place if you know of one). I’m looking for a dot net chart library. My short list contains Dundas and Essential Chart (by SyncFusion) – Have I missed something? I’d appreciate any comments re...more >>

Hi. I'm trying to capture the screen and manipulate in C#. I've found that CopyFromScreen works just as BitBlt. However, apparently in order to capture layered windows you have to pass the value of CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt. Is there any way I can do that w...more >>

Has anyone tried loading an image file in memory and annotating the image with some text and saving the file using GDI+? ...more >>

How to read Image in on same page I have Image control and I am doing iImage.ImageUrl("ImageRead.aspx") I dont want to go in to othere page, is there anywan so I can directly Read on my parent aspx page. Like iImage(Responce.write(myBytes))????? Thanks ...more >>

I'm working on a transition library, and one thing that's giving me trouble is the "blinds" effect (similar to the blinds effect in PowerPoint). The problem is that when I invalidate multiple discrete rectangles, Windows winds up invalidating a much larger area which contains all of the rectang...more >>

I am creating aspx file to upload file. I allow to user to upload file If that file size is less then 200KB and after that I want to srink that file up to 50KB (1/4 of original file). And then store in to database. Thanks Tj ...more >>

I am working on a project which renders a series of nested text and graphics objects on a form, much like a browser. It also displays a series of alternating pages, and contains dynamic content such as marquees, videos, rotating elements, and blinking elements. I'm using double buffering on al...more >>

I need to display images that are stored in a database without any meta information such as their size or type (gif, jpeg, etc). I can create a new Image object from the byte array returned from the database, this allows me to determine the size easily but I can't figure out a way to find out...more >>

I am drawing a selector on my image for cropping purposes. It is done in black, however if the image is real dark this doesn't show up well. How can I determine the darkness of an image, or areas of an image so that I can know whether to use black or white? Is there a better way? Thanks...more >>

I get a generic error (not very helpful) when attempting to save a re-sized image back to its original location. Here is the code snippet: Dim g As System.Drawing.Image = System.Drawing.Image.FromFile(Me.File1.Value) Dim thisFormat = g.RawFormat Dim imgOutput As New Bi...more >>

I have a PictureBox on a form. I need to drag the image exposed by the PictureBox "image" property to a window of Windows Explorer (or to the desktop). The new file will have a name assigned by the programmer, for instance "MyDraggedImage.png". Dim TargetDirectory As String = "HowDoIG...more >>

Ok, I looked for a few weeks on code for saving multipage tiff images to a database. Single page tiffs are no problem, it was the multipage that's the killer. Anyhow, here's the resultant code taken from a few posts and simplified. Hope it helps someone down the road. Basically, transfor...more >>

I am creating aspx file to upload file. I allow to user to upload file If that file size is less then 200KB and after that I want to srink that file up to 50KB (1/4 of original file). And then store in to database. Thanks Tj ...more >>

Hi all, I have a little problem with a toolbox I'm developing in C#. I want to make a tool to create a GraphicsPath object consisting of a rectangle with some lines in it - where the size of the rectangle as well as the placement of the lines are determined by parameters. I want the Rectang...more >>

Hi All, I got the following error when I am trying to save a tiff file using bitmap class "Invalid parameter used" faxPageImage = new Bitmap(fileName); //Error Line. Pleaz Note: I am able to open the same file in Imaging Application. I am getting this error only for few tiff files. P...more >>

Hi, I'm looking for a way to directly print to the printer. With directly I mean I don't need any driver. Just add a printer on the LPT1 (without registering it first in windows) and send data to it. The problem for me is that I have to work with really old printers (matrix-printers) and...more >>

Hi, I have written some code that creates and draws into an 8bbpIndexed bitmap using LockBitmap and direct memory access, and then saves this as a GIF. (bitmap pattern: The bitmap is filled with lines of different colours. Each horizontal line is set to a colour index of one greater than the ...more >>

I have not messed around with Flash, but have been very impressed with some ui's I've seen that move viewports around selectively exposing a hidden picture. And I have seen animations of bitmaps that were remarkably smooth. Even Microsoft uses Flash : http://www.origamiproject.com/2/ Ev...more >>

Does anyone have an example of an Ellipse user Control that properly expands the control container so the ellipse is NOT chopped off. It has been mentioned to use Flatten on the Graphics path and then get the Min/Max X and Y's but I am seeing inconsisten behavior on what that returns?????? Cod...more >>

hi, I am using Tab control, i added the tab pages , i want to change the tab pages color when ever i select the tab page, i have tabpage1,tabpage2,tabpage3 i mean when ever i select the tab page 2 the tabpage is hilighted remaing two are not hilighted, i want to change the tab page ...more >>

I'm having trouble making a multipage tiff image that is only 1bpp since it will be holding fax information. When I try to alter the pixel format I get "A Graphics object cannot be created from an image that has an indexed pixel format." My code looks something like this, where myCustomObject ...more >>

imagine three rectangles: rect0 = new Rectangle(0,125,1181,930); rect1 = new Rectangle(0,21,198,156); rect2 = new Rectangle(51,22,100,100); as you can see rect1 is a smaller version of rect0. you can also see that rect2 is somewhere inside the rect1. can someone tell me what transformation...more >>

Hello, Do you think it is legitimate practice to mix GDI+ and GDI calls (via Get/ReleaseHDC()) in paint event of a control? I've heard there is possibility of performance loss while "locking" Graphics object which is done as a side-effect to GetHDC() call - could you confirm? Another question t...more >>

What I would like is a method that takes a Image object and 4 x/y coordinates. The Image should be a normal rectangle image and the 4 coordinates should be the new locations for the corners of the original image. So I want to transform a rectangular image into a quadrilateral. I've seen a lot o...more >>

i have a Format8bppIndexed jpeg file. i load the file to an bitmap object then rotate the image use bitmap.RotateFlip function then save it to a jpeg file but the file's PixelFormat is change to Format24bppRgb? here is the code Bitmap img,img2; img = (Bitmap)Image.FromFile(@"c:\test.jpg")...more >>

hi, i've crated a custom control that allows user to draw selection rectangle over a bitmap. the selection rectangle is semi transparent and also implements cool "Marching Ants" feature :). the marching ants are moved by a timer set to interval of 100. the problem is the performance hit i g...more >>

I am trying to save multi-page tif images to a bit depth of 1 but they seem to only save as a bit depth of 32. I am using the tif saving example found on Bob Powells site. When I try to add a paramater to the image I get a "Generic Error" from GDI+. I am trying to use the following encoderpa...more >>

Hi, I have a Splash form with text drawn on it over a gradient color scheme. This same form is shown as the 'About..' box When the form is shown as the About dialog, I want to add a close button in the top-right hand corner ... but I don't want to use a control like a label (seems to not...more >>

I read an image file from the database which is in compressed format. I write it to the disk and then decompress it and view it in a picturebox. after viewing in a picturebox i want to kill the file,but this fails. If the picturebox is not used then everything works fine. The error i get is tha...more >>

Ok, my problem is the following: I'm creating a kind of object oriented painting program, where you can select every object, modify it's properties, move it, scale it, rotate it, etc... Naturally there are quite some matrix transformations involved in it, but I'm still having some problems with...more >>

Hi All, Could any one help me on this please? I'm using C# and GDI+ to create dynamic images and show them on the web. I'm loading the main image which is a jpeg, then I'm drawing some text and shapes on that base image using Graphics class of GDI+, at the end I'm sending the new image to ...more >>