earthsound

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 first is that you are using a "portable" version of Paint.NET -- a copy that is running on a USB stick, for instance. The WIA system component simply may not be installed in this case, as it requires proper installation and registration. Second, if you can't scan, then maybe your scanner doesn't support WIA. You can check to see if you scanner supports WIA by verifying that it shows up in the "Scanners and Cameras" control panel. Some scanners or cameras require that special software or drivers be installed before they work with WIA. The Windows Image Acquisition system service must also be enabled. This may be disabled if you have "tweaked" your system, or if you are running Windows Server where it is set to Disabled by default. Simply set it to "Automatic" or "Automatic (Delayed Start)" and it should work. If regular Paint can't see your devices, then Paint.NET will not be able to either.

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 created by the device manufacturer. Practically speaking, this almost always means that the TWAIN dialog will provide more options and advanced control over the device. 2. TWAIN allows you to use custom capabilities that the device manufacturer has created even though they don't exist in the TWAIN specifications. 3. In general, when a device supports both Twain and WIA, TWAIN is better for scanners and WIA is better for acquiring images from cameras and video devices. 4. TWAIN has three transfer modes (Native, Memory, File) and WIA only has two (Memory, File). 5. Most TWAIN sources save the settings of the previous scan while WIA does not. 6. TWAIN supports options for each page when scanning in duplex mode but WIA uses the same settings for both sides. Also, when you wrote this, TWAIN version 2.2 had come out in February 2012. Rick: it seems this has been asked more than a handful of times going back many years, even though it's clearly spelled out in the FAQ that WIA is what paint.net supports. The Twainable plugin only works on 32-bit paint.net, so that isn't an option for everyone. Is WIA the only device driver interface that paint.net will support in the foreseeable future? Either way, could you add it to the Popular Feature Requests post and clarify your current thoughts on the matter? Thanks!

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.

just a quick note that OptiPNG 0.6.4 was released on 2010-03-15.