I have a wired probly. I recieve pixel data from a web control (Awesomium).
I want to display the bipmap in a PictureBox.
using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(viewPortX, viewPortY, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
{
BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.WriteOnly, bmp.PixelFormat);
BitmapSurface bmpSurface = (BitmapSurface)htmlHolder.Surface;
bmpSurface.CopyTo(bmpData.Scan0, bmpSurface.RowSpan, 4, false, false);
bmp.UnlockBits(bmpData);
bmp.Save("result.jpg", ImageFormat.Jpeg);
pictureBox.Load(result.jpg);
}
This works fine. The bitmap is diaplayed.
If I change
bmp.Save("result.jpg", ImageFormat.Jpeg);
pictureBox.Load(result.jpg);
to
pictureBox.Image = bmp;
then the eror image is shown in the PictureBox.
Any idea what's is wrong?
Greetings
Clemens Hoffmann
because you destroy bmp object before it get's loaded into picturebox. using statement dispose image created within it's range.
Related
I'm trying to crop and resize an image in PictureBox1. My code:
//original image for eventually undo
undoImage = pictureBox1.BackgroundImage.Clone() as Image;
Bitmap sourceBitmap = new Bitmap(pictureBox1.BackgroundImage, pictureBox1.Width, pictureBox1.Height);
Graphics g = pictureBox2.CreateGraphics();
g.DrawImage(sourceBitmap, new Rectangle(0, 0, pictureBox2.Width, pictureBox2.Height), rectCropArea, GraphicsUnit.Pixel);
sourceBitmap.Dispose();
And it working properly on two PictureBoxes.
But PictureBox2.Image,PictureBox2.BackgroundImage (and any other including ErrorImage...) = null.
I tried PictureBox.DrawToBitmap, and other, like g.GetHdc() found on google, but unsuccessful.
My question:
How do I properly copy the edited image from PictureBox2 to PictureBox1?
Trivial solution:
undoImage = pictureBox1.BackgroundImage.Clone() as Image;
Bitmap sourceBitmap = new Bitmap(pictureBox1.BackgroundImage, pictureBox1.Width, pictureBox1.Height);
using (Graphics g = Graphics.FromImage(sourceBitmap))
{
g.DrawImage(sourceBitmap, new Rectangle(0, 0, pictureBox2.Width,pictureBox2.Height), rectCropArea, GraphicsUnit.Pixel);
}
pictureBox1.BackgroundImage = sourceBitmap;
I am getting Sequence of images from USB and with each image grabbed I convert grabbed result to System.Drawing.Bitmap and after that I convert it to System.Windows.Mesia.Imging.BitmapImage to be able to assign it to Imagesource and finally update UI in dispatcher thread, all this process takes time and it doesn't go live, the sample codes of the camera company (Basler) has used C# and directly assigns System.Drawing.Bitmap to picture box and can show live view without delay.
What is the best solution to handle it ? it worth mentioning that with 2048*2000 pixel size the frame rate is almost 50 fps
PixelDataConverter converter = new PixelDataConverter();
Bitmap bitmap = new Bitmap(grabResult.Width, grabResult.Height, PixelFormat.Format32bppRgb);
BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat);
converter.OutputPixelFormat = PixelType.BGRA8packed;
IntPtr ptrBmp = bmpData.Scan0;
converter.Convert(ptrBmp, bmpData.Stride * bitmap.Height, grabResult);
bitmap.UnlockBits(bmpData);
BitmapImage bitmapimage = new BitmapImage();
using (MemoryStream memory = new MemoryStream())
{
bitmap.Save(memory, ImageFormat.Bmp);
memory.Position = 0;
bitmapimage.BeginInit();
bitmapimage.StreamSource = memory;
bitmapimage.CacheOption = BitmapCacheOption.OnLoad;
bitmapimage.EndInit();
bitmapimage.Freeze();
}
Dispatcher.Invoke(new Action(() =>
{
imgMain.Source = bitmapimage;
}));
And this is the sample code for c# by company :
Bitmap bitmap = new Bitmap(grabResult.Width, grabResult.Height, PixelFormat.Format32bppRgb);
// Lock the bits of the bitmap.
BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat);
// Place the pointer to the buffer of the bitmap.
converter.OutputPixelFormat = PixelType.BGRA8packed;
IntPtr ptrBmp = bmpData.Scan0;
converter.Convert(ptrBmp, bmpData.Stride * bitmap.Height, grabResult); //Exception handling TODO
bitmap.UnlockBits(bmpData);
// Assign a temporary variable to dispose the bitmap after assigning the new bitmap to the display control.
Bitmap bitmapOld = pictureBox.Image as Bitmap;
// Provide the display control with the new bitmap. This action automatically updates the display.
pictureBox.Image = bitmap;
if (bitmapOld != null)
{
// Dispose the bitmap.
bitmapOld.Dispose();
}
}
enter code here
Use Dispatcher.BeginInvoke instead of Dispatcher.Invoke(...to set the image asynchronous.
Dispatcher.BeginInvoke(DispatcherPriority.Input, new Action(() =>
{
imgMain.Source = bitmapimage;
}));
I have an .rgb file that I attached. It is a valid rgb file that I verified through other software. As far as I understand this is a raw RGB data file.
I need to load the file into byte[] and display it in PictureBox.
From all my searches here I came to this solution that seems correct and that works for others. Unfortunately it displays nothing for me:
string imgPath = Path.Combine(mInstallPath, "squirrel-720x576x50.rgb\\squirrel-720x576x50.rgb");
byte[] imageData = File.ReadAllBytes(imgPath);
using (var bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb))
{
BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0,
bmp.Width,
bmp.Height),
ImageLockMode.WriteOnly,
bmp.PixelFormat);
Marshal.Copy(imageData, 0, bmpData.Scan0, width * height * 3);//imageData.Length);
//bmpSource.CopyPixels((Int32Rect.Empty, bmpData.Scan0, bmpData.Height * bmpData.Stride, bmpData.Stride);
bmp.UnlockBits(bmpData);
pictureBox.Image = bmp;
}
Any ideas why nothing is displayed in my pictureBox ?
I have this code to resize a bitmap, but all it does is to crop it instead of resizing, what I am doing wrong?
public static System.Drawing.Bitmap ResizeImage(System.Drawing.Image image, int width, int height)
{
//a holder for the result
Bitmap result = new Bitmap(width, height);
// set the resolutions the same to avoid cropping due to resolution differences
result.SetResolution(image.HorizontalResolution, image.VerticalResolution);
//use a graphics object to draw the resized image into the bitmap
using (Graphics graphics = Graphics.FromImage(result))
{
//set the resize quality modes to high quality
graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//draw the image into the target bitmap
graphics.DrawImage(image, 0, 0, result.Width, result.Height);
}
//return the resulting bitmap
return result;
}
and I call the function like this
bmPhoto = Imaging.ImageProcessing.ResizeImage(bmPhoto, scaledSize.Width, scaledSize.Height);
// Keeping Aspect Ratio
Image resizeImg(Image img, int width)
{
double targetHeight = Convert.ToDouble(width) / (img.Width / img.Height);
Bitmap bmp = new Bitmap(width, (int)targetHeight);
Graphics grp = Graphics.FromImage(bmp);
grp.DrawImage(img, new Rectangle(0, 0, bmp.Width, bmp.Height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
return (Image)bmp;
}
// Without Keeping Aspect Ratio
Image resizeImg(Image img, int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
Graphics grp = Graphics.FromImage(bmp);
grp.DrawImage(img, new Rectangle(0, 0, bmp.Width, bmp.Height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
return (Image)bmp;
}
Try using a Rectangle object to specify the portion of the new image that you want to fill, like so:
graphics.DrawImage(image, new Rectangle(0, 0, result.Width, result.Height), 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, null);
As noted the Rectangle specifies that the image should be drawn between the top left and bottom right corner, and then you provide the coordinates of the original image that you want to scale into that area (0,0,image.Width,image.Height).
I have 3D WPF visual that I want to pass into an Excel cell (via clipboard buffer).
With "normal" BMP images it works but I do not know how to convert a RenderTargetBitmap.
My code looks like this:
System.Windows.Media.Imaging.RenderTargetBitmap renderTarget = myParent.GetViewPortAsImage(DiagramSizeX, DiagramSizeY);
System.Windows.Controls.Image myImage = new System.Windows.Controls.Image();
myImage.Source = renderTarget;
System.Drawing.Bitmap pg = new System.Drawing.Bitmap(DiagramSizeX, DiagramSizeY);
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pg);
gr.DrawImage(myImage, 0, 0);
System.Windows.Forms.Clipboard.SetDataObject(pg, true);
sheet.Paste(range);
My problem is that gr.DrawImage does not accept a System.Windows.Controls.Image or a System.Windows.Media.Imaging.RenderTargetBitmap; only a System.Drawing.Image.
How do I convert the Controls.Image.Imaging.RenderTargetBitmap into an Image, or are there any easier ways?
You can copy the pixels from the RenderTargetBitmap directly into the pixel buffer of a new Bitmap. Note that I've assumed that your RenderTargetBitmap uses PixelFormats.Pbrga32, as use of any other pixel format will throw an exception from the constructor of RenderTargetBitmap.
var bitmap = new Bitmap(renderTarget.PixelWidth, renderTarget.PixelHeight,
PixelFormat.Format32bppPArgb);
var bitmapData = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size),
ImageLockMode.WriteOnly, bitmap.PixelFormat);
renderTarget.CopyPixels(Int32Rect.Empty, bitmapData.Scan0,
bitmapData.Stride*bitmapData.Height, bitmapData.Stride);
bitmap.UnlockBits(bitmapData);
This was the solution I came up with
System.Windows.Media.Imaging.RenderTargetBitmap renderTarget = myParent.GetViewPortAsImage(DiagramSizeX, DiagramSizeY);
System.Windows.Media.Imaging.BitmapEncoder encoder = new System.Windows.Media.Imaging.PngBitmapEncoder();
MemoryStream myStream = new MemoryStream();
encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(renderTarget));
encoder.Save(myStream);
//
System.Drawing.Bitmap pg = new System.Drawing.Bitmap(DiagramSizeX, DiagramSizeY);
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pg);
//
// Background
//
gr.FillRectangle(new System.Drawing.SolidBrush(BKGC), 0, 0, DiagramSizeX, DiagramSizeY);
//
gr.DrawImage(System.Drawing.Bitmap.FromStream(myStream), 0, 0);
System.Windows.Forms.Clipboard.SetDataObject(pg, true);
sheet.Paste(range);
Maybe I don't understand the question right, but you want to copy a RenderTargetBitmap to the clipboard, couldn't you just call SetImage ?:
Dim iRT As RenderTargetBitmap = makeImage() //this is what you do to get the rendertargetbitmap
If iRT Is Nothing Then Exit Sub
Clipboard.SetImage(iRT)