How can I convert a BITMAP in byte array format to JPEG format using .net 2.0?
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3 Answers
What type of byte[] do you mean? The raw file-stream data? In which case, how about something like (using System.Drawing.dll in a client application):
using(Image img = Image.FromFile("foo.bmp"))
{
img.Save("foo.jpg", ImageFormat.Jpeg);
}
Or use FromStream with a new MemoryStream(arr) if you really do have a byte[]:
byte[] raw = ...todo // File.ReadAllBytes("foo.bmp");
using(Image img = Image.FromStream(new MemoryStream(raw)))
{
img.Save("foo.jpg", ImageFormat.Jpeg);
}
1 Comment
Marc
The second one was just what I was searching for. I'm however writing into another MemoryStream rather than to file. Thanks!
If it is just a buffer of raw pixel data, and not a complete image file(including headers etc., such as a JPEG) then you can't use Image.FromStream.
I think what you might be looking for is System.Drawing.Bitmap.LockBits, returning a System.Drawing.Imaging.ImageData; this provides access to reading and writing the image's pixels using a pointer to memory.
Comments
public static Bitmap BytesToBitmap(byte[] byteArray)
{
using (MemoryStream ms = new MemoryStream(byteArray))
{
Bitmap img = (Bitmap)Image.FromStream(ms);
return img;
}
}
3 Comments
AnthonyBlake
this is a bitmap. he wants a jpeg.
jdearana
Correct, the code is not complete. But it returns a Bitmap, which you can later on save to a file in any format.... I guess this is my welcome to the Reputation Wars... My fault anyway.
gbjbaanb
@juanjo.arana but you have not given an answer to his question, just told him how to get a bitmap.