Re : Transition between images

if you don't need to control the amount of fading and images are triggered by bang, this should do what you try to achieve :
click to change image. change the amount of tint(255, amount) to change the timing of the fading.

1. PImage[] img= new PImage[25];
   int counter = 0;
   void setup()
   {
     size (400, 400);
     for (int i = 0; i<25; i++)
     {
       img[i] = loadImage(i+".jpg");
     }
   }
   void draw()
   {
     tint(255, 10);
     image(img[counter], 0, 0, width, height);
   }
   void mousePressed()
   {
     counter++;
     if (counter >img.length-1)
     {
       counter =0;
     }
   }