TweedleJPG or TweedlePNG? RRS feed

  • Question

  • I have some large-ish images:

        Geometry: 72224x64080+0+0
          Resolution: 28.34x28.34
          Print size: 2548.48x2261.12
          Units: PixelsPerCentimeter
          Type: TrueColor
          Endianess: Undefined
          Colorspace: RGB

    Why would I choose one over the other? JPG takes a lot less space, but is lossy. Will I really see a difference?

    The application is a research study involving pathologists examining and evaluating tissue slides over the internet.


    Sunday, July 31, 2011 1:05 AM

All replies

  • It really depends on your application.  For most applications I would recommend jpg with the quality set appropriately.  A png will be approximately 10 times larger than a jpg.  For viewing off of your local hard drive you probably won't see a performance difference in HDView/HDViewSL when interacting with this image (assuming you have sufficient disk space).  However, delivering the imagery over the web at 1/10th the speed may result in very slow interaction speeds.  I suggest that you experiement with your specific imagery - try various quality settings of jpeg and compare the look of the result with the png case.  If the lossy jpeg isn't losing the details that you need to convey then I would go with that.
    Sunday, July 31, 2011 9:05 PM
  • Thanks! I would have preferred a digital answer :-) but alas, reality is analog.
    Sunday, July 31, 2011 11:49 PM