asp.net c# convert filestream to image

Question

i have a filestream which im trying to convert into a image. i have the following code

FileStream imageFile = image["file"] as FileStream;

image is a map holding information on the image. please can some one direct me on what I should do next.

Why are you duplicating the image variable name? I doubt what you have will compile. — Oded
– Oded, Commented Jan 13, 2012 at 10:00
What do you mean 'convert to an image' - do you mean turn it into a Bitmap instance or serve it up to a client in response to an image request? — Andras Zoltan
– Andras Zoltan, Commented Jan 13, 2012 at 10:01
the image is on a server and I get it using a FileStream, the idea is to display the image on a web page. — c11ada
– c11ada, Commented Jan 13, 2012 at 10:08

AlexB · Accepted Answer · 2014-02-16 20:15:03Z

7

Image.FromStream will take a stream and return an image. Incidentally, if you use Bitmap.FromStream or Image.FromStream, or indeed any of these methods, they all return a Bitmap, so they can all be upcast to Bitmap from Image if you want them to be.

edited Feb 16, 2014 at 20:15

AlexB

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answered Jan 13, 2012 at 10:06

cgraus

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Salvatore Di Fazio · Accepted Answer · 2012-01-13 10:49:52Z

you can do the following:

        int width = 128;
        int height = width;
        int stride = width / 8;
        byte[] pixels = new byte[height * stride];

        // Define the image palette
        BitmapPalette myPalette = BitmapPalettes.Halftone256;

        // Creates a new empty image with the pre-defined palette
        BitmapSource image = BitmapSource.Create(
            width,
            height,
            96,
            96,
            PixelFormats.Indexed1,
            myPalette,
            pixels,
            stride);

        FileStream stream = new FileStream("new.jpg", FileMode.Create);
        JpegBitmapEncoder encoder = new JpegBitmapEncoder();
        encoder.FlipHorizontal = true;
        encoder.FlipVertical = false;
        encoder.QualityLevel = 30;
        encoder.Rotation = Rotation.Rotate90;
        encoder.Frames.Add(BitmapFrame.Create(image));
        encoder.Save(stream);

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