CODEWITHSUNDEEP
c#bitmap
user7049117
user7049117

Reputation: 27

Stitching Together Thousands Of Bitmaps

I have an List as such

List<Bitmap> imgList = new List<Bitmap>();>

i need to scroll through that list, very quickly and stitch all the images into one. Like so

using (Bitmap b = new Bitmap(imgList[0].Width, imgList[0].Height * imgList.Count, System.Drawing.Imaging.PixelFormat.Format24bppRgb))
        {
            using (Graphics g = Graphics.FromImage(b))
            {
                for (int i=0;i<imgList.Count;i++)
                {
                    g.DrawImage(imgList[i], 0, i * imgList[i].Height);
                }
            }
            b.Save(fileName, ImageFormat.Bmp);

        }
        imgList.Clear()

The problem that i'm running into is that the images are 2000 wide by 2 high, and there could be 30,000-100,000 images in the array. When I try to make a blank bitmap that size, it get a parameter not found error. Any help would be GREATLY appreciated.

Upvotes: 0

Views: 457

Answers (1)

plinth
plinth

Reputation: 49199

The size of the block of memory you need is 2 x 100,000 x 20,000 x # bytes per pixel, which is going to be either 12,000,000,000 bytes for 24 bits per pixel and 16,000,000,000 bytes for 32 bits per pixel. So in other words ~12GB or ~16GB. A 32 bit address space is just too darn small for that amount of memory, so sucks to be you.

Or does it?

Since you want to create a file from this, you should be concerned with the file limits rather than your own memory limits. Lucky for you, the size of the integer type used for image dimensions in a BMP is 32 bit, which means that a 200,000 x 2,000 image is totally within those limits. So whether or not you can make that image in memory, you can make the file.

This involves you making your own version of a BMP encoder. It's not that bad - it's most writing a BMP header, a DIB header (110 bytes total) and then raw pixel data. Of course, once done you'll be hard-pressed to find code that will open it, but that's someone else's problem, right?

Upvotes: 1

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