title: Remove meta information in picture using "convert" without changing the colors of the picture
body: <p>I have a problem using the tool <code>convert</code> (imagemagick) to remove metainformation of pictures to make them smaller for faster delivery in websites.</p>
  
  <p>When I use the convert command with following parameters:</p>
  
  <blockquote>
    <p>convert -format png -strip pic1.png pic2.png</p>
  </blockquote>
  
  <p>then the converted picture is much more darker than the original one.</p>
  
  <p>I also tried to require the colorspace of the original picture with:</p>
  
  <blockquote>
    <p>convert -format png -colorspace sRGB -strip pic1.png pic2.png</p>
  </blockquote>
  
  <p>but it's the same problem.</p>
  
  <p>Has anyone an idea how to solve it?</p>
  
  <p>These are the example pictures:</p>
  
  <p>(Original) Pic1: <img src="https://i.stack.imgur.com/DFTTc.png" alt="pic1"> </p>
  
  <p>(Converted) Pic 2: <img src="https://i.stack.imgur.com/NqwGE.png" alt="pic2"></p>