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  1. What model printer do you have? You need to make sure that if the printer manufacturer has made WIA driver(s) available for the printer, that you've installed the latest version on pc3. Also, you need to ensure that the Windows Image Acquisition service has been started. If a WIA driver isn't available for your printer, you can either 1) use the Twainable plugin (only works with 32-bit Windows OSes) or 2) use TWAIN compliant software to scan the image and then open it with paint.net. Here is the paint.net FAQ entry: Why can't I scan or print? There are three possible reasons. The
  2. First, apologies for replying to a thread from 2012. However, I noticed that TWAIN support isn't listed on the Popular Feature Requests post, so I've been looking around the forum for threads that discuss this missing feature. There are a couple of things I'd like to address/correct with regard to your statements that are copied from a wiki. Regarding the flexibility and merits of TWAIN over WIA, here is what a LEADTOOLS tech support person answered in their forums on the differences between TWAIN and WIA: 1. WIA uses a common dialog for all devices while Twain uses a dialog
  3. Perhaps it should be updated to OptiPNG 0.6.5, as versions 0.6.2 (& below) have unpatched security vulnerabilities: All past OptiPNG versions, up to and including version 0.6.2, are known to be vulnerable to use-after-free attacks, due to a bug in the GIF image reader. (Many thanks to Roy Tam for the report, and to Bryan McQuade for the fix.) OptiPNG versions 0.6 and 0.6.1 are known to be vulnerable to array-overflow attacks, due to a bug in the BMP image reader. (Many thanks to an anonymous user for the report.) 0.6.5 was release 2011-01-24.
  4. just a quick note that OptiPNG 0.6.4 was released on 2010-03-15.
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