How do I convert a binary (image) file to a jpeg file

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I want to display the image contained in a binary file in a picture box and more importantly save the binary file to a jpeg file.

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The binary file gets created from the following code:

VB

Private Shared Sub ExportJpegImage(image As PdfDictionary, ByRef count As Integer)
    Dim stream As Byte() = image.Stream.Value 
    Dim fs As New FileStream([String].Format("Image{0}.jpeg", System.Math.Max(System.Threading.Interlocked.Increment(count), count - 1)), FileMode.Create, FileAccess.Write)
    Dim bw As New BinaryWriter(fs)
    bw.Write(stream)
    bw.Close()
End Sub

Posted 5-Dec-15 20:49pm

Member 10628309

Updated 6-Dec-15 1:39am

Tomas Takac

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Kornfeld Eliyahu Peter 6-Dec-15 3:10am

JPEG is a binary image format. As BMP or PNG or GIf are...
So you have to explain what do you mean by binary here - a raw image? How it stored? What the origin of it?

Member 10628309 6-Dec-15 3:33am

The binary file gets created from the following code:
Private Shared Sub ExportJpegImage(image As PdfDictionary, ByRef count As Integer)
Dim stream As Byte() = image.Stream.Value
Dim fs As New FileStream([String].Format("Image{0}.jpeg", System.Math.Max(System.Threading.Interlocked.Increment(count), count - 1)), FileMode.Create, FileAccess.Write)
Dim bw As New BinaryWriter(fs)
bw.Write(stream)
bw.Close()
End Sub

Kornfeld Eliyahu Peter 6-Dec-15 3:49am

So you are loading a JPEG, store it as 'binary' (but actually done no change so it is still a JPEG) and now you are asking how to store it as JPEG again?
It seems to me that you do not understand what image is, but most you do not understand even a single line of the code you copied here...

Richard MacCutchan 6-Dec-15 8:30am

A PdfDictionary is not an image, so you cannot do that.

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-12-06T06:27:00

Assuming your "binary file" contains image data, that is, the data about the color (and, optionally, alpha channel value, opacity) for each pixel in the format you know, but not one of the standard image formats, you can solve the problem in the following steps:

Create the instance of the class System.Drawing.Bitmap of required pixel size and pixel format:
https://msdn.microsoft.com/en-us/library/7we6s1x3(v=vs.110).aspx[^],
https://msdn.microsoft.com/en-us/library/3z132tat(v=vs.110).aspx[^].
Get access to the bitmap pixel data. Using LockBits and two nested loops by x and y indices, copy your data from your file to the pixels of the image: https://msdn.microsoft.com/en-us/library/system.drawing.bitmap.lockbits%28v=vs.110%29.aspx[^].

You can find the code sample on the MSDN help pages one of the two functions. See also: https://msdn.microsoft.com/library/ms229672%28v=vs.90%29[^].
Save the instance of the bitmap obtained as JPEG file:
https://msdn.microsoft.com/en-us/library/ms142147(v=vs.110).aspx[^],
https://msdn.microsoft.com/en-us/library/system.drawing.imaging.imageformat(v=vs.110).aspx[^].

—SA

How do I convert a binary (image) file to a jpeg file

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How do I convert a binary (image) file to a jpeg file

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