Using ImageMagick with Unity

An article by mgear

13 Comments

(result image: add watermark/logo stamp to image)

Using ImageMagick with Unity is now possible with the .NET wrapper (github)

Tutorial: Add watermark to image

– Download required DLL files from https://magick.codeplex.com/releases/view/630360 (I used Magick.NET-7.0.4.400-Q8-x64.zip)
– From the zip file, copy “net20\Magick.NET\Magick.NET-Q8-x64.dll” into your Unity project Assets/Plugins/-folder
– From the zip file, copy “net20\Magick.NET\Magick.NET-Q8-x64.Native.dll” into your Unity project root folder (where the project .sln file is also)
– Copy “System.Drawing.dll” (v2.0) from your c: drive into your Unity project Assets/Plugins/-folder (I founded mine from C:\Windows\Microsoft.NET\Framework\v2.0.50727\)
– Download few sample images from Magick.NET examples here and copy those image files into your ‘Assets/Images/’ folder (or adjust the script below to point into correct image path)
– Add the c# script below to your scene and test it!
– See more tutorial sources at Magick github samples directory

example script (c#)

	// using ImageMagick with unity : http://1darray.com/blog/2017/01/27/using-imagemagick-with-unity/

	using System.Collections;
	using System.Collections.Generic;
	using UnityEngine;
	using ImageMagick;

	public class ImageMagickTest : MonoBehaviour
	{
	void Start()
	{
	CreateWatermark();
	}


	public void CreateWatermark()
	{
	// our image paths
	var sourcePath = Application.dataPath + "/Images/FujiFilmFinePixS1Pro.jpg";
	var watermarkPath = Application.dataPath + "/Images/Snakeware.png";

	// Read image that needs a watermark
	using (MagickImage image = new MagickImage(sourcePath))
	{

	// Read the watermark that will be put on top of the image
	using (MagickImage watermark = new MagickImage(watermarkPath))
	{
	// Draw the watermark in the bottom right corner
	image.Composite(watermark, Gravity.Southeast, CompositeOperator.Over);

	// Optionally make the watermark more transparent
	watermark.Evaluate(Channels.Alpha, EvaluateOperator.Divide, 4);

	// Or draw the watermark at a specific location
	image.Composite(watermark, 200, 50, CompositeOperator.Over);
	}

	// Save the result
	image.Write(Application.dataPath + "/Images/" + "FujiFilmFinePixS1Pro-watermark.jpg");
	}
	}
	}

view raw

ImageMagick.cs

hosted with ❤ by GitHub

Tags: .net, convert, dll, edit, image, ImageMagick, processing

About the Author:

.fi

13 Comments + Add Comment

Ananth 03/02/2017 at 01:49

Hi, just wondering if I will be able to make an app to publish for Android using this library on Unity?

Reply
- mgear 09/02/2017 at 09:58
  
  havent tested, but i’m thinking the native library might not work.. going to try later.
  
  Reply
Tomasz 08/02/2017 at 16:59

That sounds really fantastic!
But ImageMagick as a common graphic php library is capable of interpretation of most of graphic file formats, in the contrary to php GD library.
Means it should enable to drag the svg, pdf, ai .tif files into Unity and display them as textures. Am I right?

Reply
- mgear 09/02/2017 at 09:57
  
  that would be amazing! gotta test that soon..
  
  Reply
Jorge 25/10/2018 at 17:25

Thank you for sharing Mgear. 🙂

Reply
Luciano 19/04/2019 at 00:59

Hey, you have tested for make an app for Android using this library? and read pdf files for display on textures?

Reply
Christian 05/12/2019 at 10:00

Hello Mika, thanks a lot for this tutorial. I followed your steps and placed both .dll files in the appropriate folders, copied the System.Drawing.dll file into my Assets/Plugins/ folder, attached the ImageMagickTest.cs script to an empty game object and ran the game. I’m not getting any errors or warning messages, but unfortunately nothing happens. There is no 3rd image being created out of the original 2 images. I’ve searched many forums online and can’t seem to find a solution. Do you by any chance have this project in some repository that I could download? I’d love to take a closer look at a working, functional version of this. Thanks for your time!

Reply
- mgear 06/12/2019 at 03:11
  
  did you try Refresh unity project window (right click, refresh) ?
  
  i tested on 2018.3.x seems to work directly also. i can try to put the project somewhere later.
  
  Reply
  - Christian 07/12/2019 at 03:03
    
    Thanks for the response. I realized my issue had actually come from a small detail I missed. When I clicked Build and Run, my selected architecture was incompatible with the .dll, so changing this to the correct one fixed my issue. Cheers.
    
    Reply
janeDoe 06/03/2020 at 20:01

Works great in editor, and then when I do a standalone windows build I get:
NotSupportedException: IL2CPP does not support marshaling delegates that point to instance methods to native code. The method we’re attempting to marshal is: ImageMagick.StreamWrapper::Write

any idea if there’s a workaround for this? It’s from the ToByteArray method here:

Texture2D newTexture = new Texture2D(2, 2, TextureFormat.ARGB32, false);
newTexture.LoadImage(image.ToByteArray(MagickFormat.Png32));

Reply
- mgear 07/03/2020 at 07:31
  
  no idea.. but can you try some of these?
  https://github.com/natbro/UnityPlugin/issues/2
  https://answers.unity.com/questions/1229036/callbacks-from-c-to-c-are-not-working-in-540f3.html
  https://forum.unity.com/threads/making-calls-from-c-to-c-with-il2cpp-instead-of-mono_runtime_invoke.295697/
  
  Reply
Jed 13/05/2020 at 00:39

Has anyone tried to make this multithreaded or use this with the job system? Would love to see an example if you’ve succeeded

Reply
- mgear 13/05/2020 at 02:18
  
  pretty sure that it should work (since it doesnt call any unity methods),
  could test it by calling CreateWatermark() from regular thread:
  https://gist.github.com/unitycoder/8721e5bd6377ac2ffbba4f9b0b2766f0#file-multithreading-cs
  
  Reply