Out Of Memory exception on System.Drawing.Image.FromFile()

asp.netbitmapimage

I have an image uploader and cropper which creates thumbnails and I occasionally get an Out Of Memory exception on the following line:

Dim bm As Bitmap = System.Drawing.Image.FromFile(imageFile)

The occurance of the error is tiny and very rare, but I always like to know what might be causing it. The imageFile variable is just a Server.MapPath to the path of the image.

I was curious if anyone had experience this issue previously and if they had any ideas what might be causing it? Is it the size of the image perhaps?

I can post the code if necessary and any supporting information I have, but would love to hear people's opinions on this one.

Best Answer

It's worth knowing that OutOfMemoryException doesn't always really mean it's out of memory - particularly not when dealing with files. I believe it can also happen if you run out of handles for some reason.

Are you disposing of all your bitmaps after you're done with them? Does this happen repeatably for a single image?

Related Solutions

C# Image.Clone Out of Memory Exception

Clone() may also throw an Out of memory exception when the coordinates specified in the Rectangle are outside the bounds of the bitmap. It will not clip them automatically for you.

Android – Strange OutOfMemory issue while loading an image to a Bitmap object

To fix the OutOfMemory error, you should do something like this:

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap preview_bitmap = BitmapFactory.decodeStream(is, null, options);

This inSampleSize option reduces memory consumption.

Here's a complete method. First it reads image size without decoding the content itself. Then it finds the best inSampleSize value, it should be a power of 2, and finally the image is decoded.

// Decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
    try {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f), null, o);

        // The new size we want to scale to
        final int REQUIRED_SIZE=70;

        // Find the correct scale value. It should be the power of 2.
        int scale = 1;
        while(o.outWidth / scale / 2 >= REQUIRED_SIZE && 
              o.outHeight / scale / 2 >= REQUIRED_SIZE) {
            scale *= 2;
        }

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
    } catch (FileNotFoundException e) {}
    return null;
}

Best Answer

Related Solutions

C# Image.Clone Out of Memory Exception

Android – Strange OutOfMemory issue while loading an image to a Bitmap object

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