The last line of the following code gives the error "Parameter is not valid", when the original image is an SVG:
var imageBytes = Convert.FromBase64String(imageBase64String);
var memStream = new MemoryStream(imageBytes);
//memStream.Seek(0, SeekOrigin.Begin);
var imageObject = new Bitmap(memStream);
Help please. Thanks.
EDIT: The image for example I am using is the image of the first formula in the following page right under the Theoremsection:
https://en.wikipedia.org/wiki/Green%27s_theorem
Can you try with 'using' for memorystream to handle garbage collection by itself?
var imageBytes = Convert.FromBase64String(imageBase64String);
Bitmap m = ByteToBitmap(imageBytes);
public static Bitmap ByteToBitmap(byte[] imageByte)
{
using (MemoryStream mStream = new MemoryStream())
{
mStream.Write(imageByte, 0, imageByte.Length); // this will stream dataand handle image length by itself
mStream.Seek(0, SeekOrigin.Begin);
Bitmap bm = new Bitmap(mStream);
return bm;
}
}
For SVG,
public static Bitmap ByteToBitmap(byte[] imageByte)
{
using (MemoryStream mStream = new MemoryStream(imageByte))
{
var s= SvgDocument.Open(mStream);
var bm= svgDocument.Draw();
return bm;
}
}
Related
I have two functions: one to convert from image to byte and other to convert from byte to bitmapImage.
So, when I open the window with that images, I convert from byte to bitmapImage and it works great, but when I close and open it again it just keeps on memory and if I continue to do that time and time again it just throws an exception Out Of Memory exception
Image to byte->
private byte[] ConvertImageToBinary(Image img)
{
using (MemoryStream ss = new MemoryStream())
{
img.Save(ss, System.Drawing.Imaging.ImageFormat.Jpeg);
var s = ss.ToArray();
var jpegQuality = 50;
Image image;
using (var inputStream = new MemoryStream(s))
{
image = Image.FromStream(inputStream);
var jpegEncoder = System.Drawing.Imaging.ImageCodecInfo.GetImageDecoders()
.First(c => c.FormatID == System.Drawing.Imaging.ImageFormat.Jpeg.Guid);
var encoderParameters = new System.Drawing.Imaging.EncoderParameters(1);
encoderParameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, jpegQuality);
Byte[] outputBytes;
using (var outputStream = new MemoryStream())
{
image.Save(outputStream, jpegEncoder, encoderParameters);
return outputBytes = outputStream.ToArray();
}
}
}
}
Byte to bitmap ->
public BitmapImage ConvertBinaryToImage(byte[] array)
{
var image = new BitmapImage();
using (var ms = new MemoryStream(array))
{
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad; // here
image.StreamSource = ms;
image.EndInit();
image.Freeze();
}
return image;
}
When I open the WindowDragAndDrop it loads all the images
But when I close it it still uses the same amount of memory
Image is indeed disposable (https://learn.microsoft.com/en-us/dotnet/api/system.drawing.image?view=netframework-4.8), so you also need:
using (var image = Image.FromStream(inputStream)){
}
Around everywhere you use Image objects.
I have problem with converting BitmapImage to byte[]. I tried a lot of solutions and nothing works, every time i get different errors.
For example i found nice solutions but it also doesn't work. What's wrong with it?
I'm using Windows Phone 8.1.
public static byte[] ImageToBytes(BitmapImage img)
{
using (MemoryStream ms = new MemoryStream())
{
WriteableBitmap btmMap = new WriteableBitmap(img);
System.Windows.Media.Imaging.Extensions.SaveJpeg(btmMap, ms, img.PixelWidth, img.PixelHeight, 0, 100);
img = null;
return ms.ToArray();
}
}
this was taken from here: Convert Bitmap Image to byte array (Windows phone 8)
There is no argument given that corresponds to the required formal
parameter 'pixelHeight' of 'WriteableBitmap.WriteableBitmap(int, int)'
The type or namespace name 'Extensions' does not exist in the
namespace 'System.Windows.Media.Imaging' (are you missing an assembly
reference?)
or if somebody has got another idea how to convert it, please post it. Thanks a lot for any help!
I also tried this: BitmapImage to byte[]
but there was problem with usings
'BitmapImage' is an ambiguous reference between 'System.Windows.Media.Imaging.BitmapImage' and 'Windows.UI.Xaml.Media.Imaging.BitmapImage'
so I used "BitmapEncoder" but it doesn't have method like Save and Frame.
I think that it can't be done on this platform. I change my project to Windows Phone Silverlight/8.0 and there is working everything.
public static BitmapImage BytesToImage(byte[] bytes)
{
BitmapImage bitmapImage = new BitmapImage();
try
{
using (MemoryStream ms = new MemoryStream(bytes))
{
bitmapImage.SetSource(ms);
return bitmapImage;
}
}
finally { bitmapImage = null; }
}
public static byte[] ImageToBytes(BitmapImage img)
{
using (MemoryStream ms = new MemoryStream())
{
WriteableBitmap btmMap = new WriteableBitmap(img);
System.Windows.Media.Imaging.Extensions.SaveJpeg(btmMap, ms, img.PixelWidth, img.PixelHeight, 0, 100);
img = null;
return ms.ToArray();
}
}
see the below link it might help
https://social.msdn.microsoft.com/Forums/en-US/713c0ed1-d979-43ef-8857-bbe0b35576a9/windows-8-how-to-convert-bitmapimage-into-byte?forum=winappswithcsharp
Have you tried
MemoryStream ms = new MemoryStream();
WriteableBitmap wb = new WriteableBitmap(myImage);
wb.SaveJpeg(ms, myImage.PixelWidth, myImage.PixelHeight, 0, 100);
byte[] imageBytes = ms.ToArray();
You can also use extension method here
public static class MyExtensions
{
public static Byte[] ByteFromImage(this System.Windows.Media.Imaging.BitmapImage imageSource)
{
Stream stream = imageSource.StreamSource;
Byte[] imagebyte = null;
if (stream != null && stream.Length > 0)
{
using (BinaryReader br = new BinaryReader(stream))
{
imagebyte = br.ReadBytes((Int32)stream.Length);
}
}
return imagebyte;
}
}
and then call
System.Windows.Media.Imaging.BitmapImage myImage = new System.Windows.Media.Imaging.BitmapImage();
byte[] imageBytes = myImage.ByteFromImage();
If you're going to do any transformation on the image, you'll want to use the appropriate image encoder, then do something like below. If you're working with a multi-frame image (eg TIF), you need to add the frames one at a time to the encoder or you'll only get the first frame of the image.
MemoryStream ms = null;
TiffBitmapEncoder enc = null
enc = new TiffBitmapEncoder();
enc.Compression = TiffCompressOption.Ccitt4;
enc.Frames.Add(BitmapFrame.Create(bmpImg));
using (ms = new MemoryStream())
{
enc.Save(ms);
}
return ms.ToArray();
Hi am trying to get bitmap to display from DICOM file , but when try to create bitmap from the buffer I get Parameter is not valid for the Bitmap constructor call. I use the following code
gdcm.ImageReader reader = new gdcm.ImageReader();
reader.SetFileName(_dicomFilePath);
if (reader.Read())
{
var image = reader.GetImage();
if (image != null)
{
byte[] imageByteArray = new byte[image.GetBufferLength()];
if (image.GetBuffer(imageByteArray))
{
MemoryStream stream = new MemoryStream();
stream.Write(imageByteArray, 0, imageByteArray.Length);
stream.Seek(0, SeekOrigin.Begin);
Bitmap bmp = new Bitmap(stream);
CurrentFrameDataGDCM = Imaging.CreateBitmapSourceFromHBitmap(
bmp.GetHbitmap(),
IntPtr.Zero,
Int32Rect.Empty,
BitmapSizeOptions.FromWidthAndHeight((int)image.GetRows(), (int)image.GetColumns()));
}
}
}
I am having trouble converting an image resource into byte[].
For example, I have the following resource:
pack://application:,,,/AppName;component/Assets/Images/sampleimage.jpg
in my program. How do I convert this into a byte[].
I've tried using a BitMapImage, but it's ImageSource ends up being null after initialised.
This seems to work:
var info = Application.GetResourceStream(uri);
var memoryStream = new MemoryStream();
info.Stream.CopyTo(memoryStream);
return memoryStream.ToArray();
A general solution to convert a BitmapSource into a byte[] would look like this:
public byte[] GetImageBuffer(BitmapSource bitmap, BitmapEncoder encoder)
{
encoder.Frames.Add(BitmapFrame.Create(bitmap));
using (var stream = new MemoryStream())
{
encoder.Save(stream);
return stream.ToArray();
}
}
You would use it like shown below, with any of the BitmapEncoders that are available in WPF.
var uri = new Uri("pack://application:,,,/AppName;component/Assets/Images/sampleimage.jpg");
var bitmap = new BitmapImage(uri);
var buffer = GetImageBuffer(bitmap, new JpegBitmapEncoder());
I am trying to extract a BitmapImage from a JPG. This is the code I have:
FileStream fIn = new FileStream(sourceFileName, FileMode.Open); // source JPG
Bitmap dImg = new Bitmap(fIn);
MemoryStream ms = new MemoryStream();
dImg.Save(ms, ImageFormat.Jpeg);
image = new BitmapImage();
image.BeginInit();
image.StreamSource = new MemoryStream(ms.ToArray());
image.EndInit();
ms.Close();
image comes back with a 0 × 0 image, which of course means it didn't work. How do I do this?
Try this:
public void Load(string fileName)
{
using(Stream BitmapStream = System.IO.File.Open(fileName,System.IO.FileMode.Open ))
{
Image img = Image.FromStream(BitmapStream);
mBitmap=new Bitmap(img);
//...do whatever
}
}
Or you can just do this (source):
Bitmap myBmp = Bitmap.FromFile("path here");