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  1. Pictures and images from scientific equipment should be sized according to the final dimensions of the poster when it prints out.
  2. You cannot make images larger - they will become pixellated and look unprofessional.  Think of how pictures on balloons look when you blow them up.  The same thing happens when you try to make a too-small image bigger in PowerPoint or Publisher.
  3. Pay attention to the resolution (dots per inch or dpi) of images. 
    1. Most images from the web and screenshots from a computer are 72 dpi   You can get nice printouts for images at 72 dpi, but they tend to be too small to fit on posters any larger than 8.5x11
    2. Printed images should ideally be no more than 200 dpi
    3. If you are exporting an image from scientific software, make sure to export at 200 dpi in .jpg, .png, .gif, or .tiff format. 

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