Images are overlapping in gif

[paulius-petkus]

Magick.NET version

14.8.0

Environment (Operating system, version and so on)

Windows

Description

I am creating gif image from 2 source images. Source images are overlapping in the result gif:

Steps to Reproduce

This is my .Net 8 code snippet:

            using (var collection = new MagickImageCollection())
            {
                var gifAdded = false;
                List<string> sourceFiles = [@"C:\Users\petku\Downloads\GifImages\619971-1E.png", @"C:\Users\petku\Downloads\GifImages\619971-2E.png"];
                foreach (var conversionSourceFile in sourceFiles)
                {
                    collection.AddRange(conversionSourceFile);
                }

                foreach (var image in collection)
                {
                    if (Conversion.ToBoolean(ImageParameter.PersistAnimation()) && gifAdded)
                    {
                    }
                    else
                    {
                        image.AnimationIterations = 0;
                        image.AnimationDelay = 100;
                    }


                    var imageResolution = 200;
                    var height = 0;
                    var width = 0;
                    var scaleImage = false;
                    var scaleProportions = true;
                    var scaleIfLarger = false;


                    image.Density = new Density(imageResolution, imageResolution, DensityUnit.PixelsPerInch);
                    
                }
                
                collection.Coalesce();
                collection.Optimize();
                collection.OptimizeTransparency();

                using (var fs = File.Create(Conversion.DestinationLocation + @"\result.gif"))
                {
                    collection.Write(fs, MagickFormat.Gif);
                }
            }

Images

[dlemstra]

You should also set image.GifDisposeMethod = GifDisposeMethod.Previous; to tell gif writer that the previous image should be cleared. And there is also no need to call the Coalesce method.