title: Stack multiple images in semitransparent layers with Imagemagick?
body: <p>What is a simple way to stack multiple (~ 10) PNG images as layers with the same transparency that's less than 100% using one or two <code>Imagemagick</code> commands? </p>
  
  <p>The source images are the same size and are not transparent.</p>
  
  <p>I tried several variants of this:</p>
  
  <p><code>composite -dissolve 50 in1.png in2.png -alpha Set out.png</code></p>
  
  <p>The best that I could get is one image stacked as semintransparent against another that is solid. No success with wildcards. I'm a casual user of <code>Imagemagick</code>.  I guess that I could write a script or a simple program that would do what I want for multiple images, but there may be a simple way to do it in <code>Imagemagick</code> already, and that's what I'm hoping to find. </p>
  
  <p>Modifying the images would be okay, e.g. setting the alpha to some value using a command that takes a wildcard and then stacking them.</p>