title: ImageMagick memory usage
body: <p>I have 100 PNG-files and each of them is 8250x4090 big. I need to append them with Imagemagick to one big PNG-file (82500 x 40900) so that I have 10 rows and 10 columns  . I know how the code must look like but I get the errors: convert.exe: unable to extend cache </p>
  
  <pre><code>`C:\Row_345.png': No space left on device @ error/cache.c/OpenPixelCache/3689.
  convert.exe: Memory allocation failed `C:\Row_345.png' @ error/png.c/WriteOnePNGImage/8725.
  </code></pre>
  
  <p>First question: How much space is needed (approximately)? I have 8 GB of Ram and 30 GB free SSD and it wasn't enough. The pictures have polygons and lines in up to 5 different colors. The biggest PNG is 300 KB)
  Second question: Is there a way how to make it more clever so that it won't use that much space? </p>