Crash with (0xc0000005) 'Access violation' exception.

I am trying to assemble many tiles to create a new image. for this, i have make this :

  await Task.Run(() =>
            {
                var image = NetVips.Image.Black(18642 + 1, 10860 + 1);
                string save_directory = @"C:\Users\franc\Documents\SharpDevelop Projects\Test_Netvips\Test_Netvips\images\";
                for (int decalage_boucle_for_y = 0; decalage_boucle_for_y <= 42; decalage_boucle_for_y++)
                {
                    for (int decalage_boucle_for_x = 0; decalage_boucle_for_x <= 73; decalage_boucle_for_x++)
                    {
                        int tuile_x = 135732 + decalage_boucle_for_x;
                        int tuile_y = 90908 + decalage_boucle_for_y;

                        int pixel_decalage_x = (decalage_boucle_for_x * 256);
                        int pixel_decalage_y = (decalage_boucle_for_y * 256);

                        string filename = save_directory + "tiles\\" + tuile_y + "_" + tuile_x + "." + "jpeg"; ;
                        using var tile = NetVips.Image.NewFromFile(filename);
                        image = image.Insert(tile, pixel_decalage_x, pixel_decalage_y);
                        tile.Dispose();
                    }
                }

                image.WriteToFile(save_directory + "final.jpeg");
                image = null;
            });
            MessageBox.Show("End");

When i run this code, all working perfectly but sometimes, after few secondes, the exe close and print into the console this :

Le programme '[20928] Test_Netvips.exe' s'est arrêté avec le code -1073741819 (0xc0000005) 'Access violation'.

here, a full exemple app where i have the issue : https://github.com/SioGabx/test_NetVips/tree/main/Test_Netvips and here a .zip with all of my tiles for my exemple app (39MO) : https://drive.google.com/file/d/1EBi7F49uqvc2UOWD6782EXfYXD71aeno/view?usp=sharing

What is wrong ? Ps : Sorry for my bad english :p

[SioGabx]

That’s good. I would check arrayjoin as well – it should be quite a bit quicker.

Effectively, arrayjoin for the same work save me 2Go of ram and is a lot faster 😄

[jcupitt]

That’s good. I would check arrayjoin as well – it should be quite a bit quicker.