title: Blend multiple images with ImageMagic
body: <p><a href="https://i.stack.imgur.com/LS7zb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LS7zb.png" alt="img1"></a>
  <a href="https://i.stack.imgur.com/q1lwz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/q1lwz.png" alt="img2"></a></p>
  
  <p>My problem is the following : </p>
  
  <p>I have several .png files. Each file has a small spot of a certain color. All the files have the same size. My question is how to overlay them together so that the spots of different colors will be a mixture of this colors and one color do not overlap completely the other one? The <code>-flatten</code> option combines images but on the example orange (img1) color will be covered by brown (img2), instead I want a spot of mixing color (brownish). </p>
  
  <p>I tried: </p>
  
  <p><code>convert -evaluate-sequences mean</code> -- didn't help</p>
  
  <p><code>convert -layers merge</code> -- didn't help</p>
  
  <p><code>composite -blend</code>  -- help, but can combine only two images</p>
  
  <p>Thanks for any tips</p>