Convert .Net Bitmap() to MagickImage

user_5530047 0
Viewed 2075

An upgrade from ImageMagick 7.17 to 7.22.2.1 NuGet results in the following error on the constructor of a MagickImage. I can't put my finger on the replacement methods. Help me locate the documentation. Thank you,

Argument 1: cannot convert from 'System.Drawing.Bitmap' to 'byte[]'

Code:

var bitmap = new Bitmap(somesource);
var m = new MagickImage(bitmap);
imagemagick
3 Answers

I've only just started playing with this, so this may not be great code, but it has worked for me so far.

public static Bitmap ToBitmap(this IMagickImage mimg, MagickFormat fmt = MagickFormat.Png24)
{
    Bitmap bmp = null;
    using (MemoryStream ms = new MemoryStream())
    {
        mimg.Write(ms, fmt);
        ms.Position = 0;
        bmp = (Bitmap)Bitmap.FromStream(ms);
    }
    return bmp;
}
public static IMagickImage ToMagickImage(this Bitmap bmp)
{
    IMagickImage img = null;
    MagickFactory f = new MagickFactory();
    using (MemoryStream ms = new MemoryStream())
    {
        bmp.Save(ms, ImageFormat.Bmp);
        ms.Position = 0;
        img = new MagickImage(f.Image.Create(ms));
    }
    return img;
}

Some ImageMagick operations seem to require a different format when writing to the stream, so you may need to play with the fmt parameter.

user_503560

Bitmap reader was moved to Magic.NET.SystemDrawing.

var m = new MagickFactory();
MagickImage image = new MagickImage(m.Image.Create(objImage));
user_55300470

I ended up using both answers to use my bitmaps with MagickImageCollection().

using var collection = new MagickImageCollection();

for(var frame = 0; frame < _animation.Length; frame++) {
    Bitmap        bitmap        = _animation[frame];
    Bitmap        canvas        = new Bitmap(bitmap.Width, bitmap.Height);
    MagickFactory magickFactory = new MagickFactory();

    using MemoryStream memoryStream = new MemoryStream();
    using Graphics     graphics     = Graphics.FromImage(canvas);

    graphics.FillRectangle(Brushes.Transparent, 0, 0, bitmap.Width, bitmap.Height);
    graphics.DrawImage(bitmap, new Point(0, 0));

    canvas.Save(memoryStream, ImageFormat.Png);
    canvas.Dispose();

    collection.Add(new MagickImage(magickFactory.Image.Create((Bitmap)Image.FromStream(memoryStream))));
    collection[frame].AnimationDelay = 100;

    memoryStream.Close();
}

collection.Quantize(new QuantizeSettings { Colors = 256 });
collection.Write(dialog.FileName);
collection.Dispose();

I should note that I am using Magick.NET.SystemDrawing v4.0.19 and Magick.NET-Q16-AnyCPU v11.0.0 in this project. I hope this helps for future readers.

user_30054490
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