Yes you can just use:
// A byte array that contains a .jpeg data.
System.IO.Stream BitmapStream = System.IO.MemoryStream(byteBuffer);
System.Drawing.Bitmap MyImage = System.Drawing.Bitmap.FromStream(BitmapStream);
MyImage.Save("C:\Folder\Folder\image.jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);
But how could you do this without System.Drawing?
I would like to write my own code to create the image.
If you have the image in bytes you don't need to use drawing to make an image, just save it as a binary file.
System.IO.File.WriteAllBytes("C:\Folder\Folder\image.png", byteBuffer);
Related
I pick an image from the device and it's mirrored that's normal but I want to flip it horizontally before send it to API as to preview it after that normal not mirrored and do this on base64 string image.
You have not posted all the information however.
In Xamarin Forms Platform you can use FFImageLoading plugin which supports the transformation you are looking for. It support:
FlipTransformation
RotateTransformation
Follow the link to find their implementation here:
https://github.com/luberda-molinet/FFImageLoading/blob/master/samples/ImageLoading.Forms.Sample/Shared/Pages/Transformations/FlipTransformationPage.xaml
Your question did not explain clearly what you want to do.You can update it with more detail you want to conver what type to what type First.Whatever, I show a possible answer.
image path to base64 string：
// provide read access to the file
FileStream fs = new FileStream(media.Path, FileMode.Open,FileAccess.Read);
// Create a byte array of file stream length
byte[] ImageData = new byte[fs.Length];
//Read block of bytes from stream into the byte array
fs.Read(ImageData,0,System.Convert.ToInt32(fs.Length));
//Close the File Stream
fs.Close();
string _base64String = Convert.ToBase64String (ImageData);
base64 string to byte[]：
byte[] data = Convert.FromBase64String (FileRespone);
I used to flip the image as bitmap not Base64
in Android
https://acomputerengineer.wordpress.com/2016/06/07/flip-imagebitmap-horizontally-and-vertically-in-android/
in IOS:
How to flip UIImage horizontally?
UIImage sourceImage = uiImage;//[UIImage imageNamed: #"whatever.png"];
UIImage flippedImage = sourceImage.GetImageFlippedForRightToLeftLayoutDirection();
//[UIImage imageWithCGImage: sourceImage.CGImage scale: sourceImage.scale orientation: UIImageOrientationUpMirrored];
I work on a project where i need to process a image i receive from a socket and to display it.
I'm getting the image in jpeg format,and i cannot just use the Image.FromStream()); method for retrieving the image,because it contains more data and i want to process it while i'm reading the data-for efficiency reasons.(Basically what i want is to read the image from the stream manually).
Is there any source which explaines how these image are stored in the MemoryStream?
The MemoryStream is built on a byte[] buffer,i resuse the same buffer also and i do not create a new MemoryStream everytime the method called.
A sample of code:
private byte[] BlockToJpeg()
{
Bitmap block=new Bitmap("...");
MemoryStream ms=new MemoryStream();
block.Save(ms, ImageFormat.Jpeg);
return ms.GetBuffer();
}
So the call would look like this
byte[] buffer=BlockToJpeg();
sck.Send(buffer);//sending the buffer...not the full code because this is not our problem.
Now in the Reciver side,when i'll get that buffer:
Byte[] RecieveBuffer=sck.Recieve();//again,kind of pseudo code,because this is not the relevant part.
i have to processes it's pixels,so i'll prefer to read them from the byte[] array one by one manually...
Is there any structure for reading this(in our case-reading a jpeg image stored as byte array)?
For example- first 4 bytes are width,second are height...3rd are PixelFormat and the rest are the pixels values...or somthing...?
Thanks.
jpeg is type of compression method usually on images.
you can read more about it here:http://www.ams.org/samplings/feature-column/fcarc-image-compression
i am saving image into database as binary format, and while retrieving i am converting that binary format into image file and displaying.
byte[] picbin = (byte[])(binary data in datbase);
ImageConverter ic = new ImageConverter();
System.Drawing.Image img = (System.Drawing.Image)ic.ConvertFrom(picbin);`
and saving img- variable into some folder, by giving some name. but now i need to able to provide "downloadable option" to the user for that particular image in any one format, so that user can verify it so what is the way to implement this.
To convert image to different format:
// Save the image in JPEG format.
img.Save(#"C:\test.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
// Save the image in GIF format.
img.Save(#"C:\test.gif", System.Drawing.Imaging.ImageFormat.Gif);
// Save the image in PNG format.
img.Save(#"C:\test.png", System.Drawing.Imaging.ImageFormat.Png);
Check How to: Convert Images from One Format to Another
I have an file name data.yuv ( It's contain image data in YUV format).
What I need to do to convert the file to jpg or bmp image with C# ?
If I save the yuv file to image. It's show an green image. Thus, I need codes to convert data from yuv to image.
Open that file by using a FileStream and use the constructor of Bitmap to convert the stream to a valid bitmap.
FileStream fs = new FileStream("somefile.yuv", FileMode.Open);
Bitmap bmp = new Bitmap(fs);
I'm trying to load an emf file in to an Image Object, however the RawFormat is always incorrect {[ImageFormat: b96b3cac-0728-11d3-9d7b-0000f81ef32e]} instead of Emf. I've tried loading from a file stream and memory stream. I've also tried creating a MetaFile object instead of an Image but to no avail. Is this a bug or there some other trick I don't know about?
MemoryStream stream = new MemoryStream(imageData);//imageData is a byte array
Image tempImage = Image.FromStream(stream);
Does this help?
System.Drawing.Imaging.ImageFormat.Emf.Guid = {b96b3cac-0728-11d3-9d7b-0000f81ef32e}
Dan