When comparing ImageGlass vs Microsoft Photos, the Slant community recommends ImageGlass for most people. In the question“What are the best image viewers for Windows?” ImageGlass is ranked 4th while Microsoft Photos is ranked 16th. The most important reason people chose ImageGlass is:
As long as you have enough skill you can mold it to your liking.
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Pros
Pro Open source
As long as you have enough skill you can mold it to your liking.
Pro It handles animated GIF files really well
Animated GIF files (let it be transparent or regular) are played seamlessly even if you zoom in and out.
Pro Portable version available
If you don't want to or you can't install ImageGlass, you can go with the portable.
Pro Good looking
Pro Pre-installed on Windows 10
For Windows 10 users, it comes preinstalled.
Cons
Con Does not support APNG
It does not support the Animated Portable Network Graphic (APNG) format yet. And it is a con worth considering.
Con No editing options
The program lacks any kind of image manipulation or batch processing features like Irfanview or XnView has. If you're an advanced user, this will be the biggest con against this software.
Con Color picker doesn't have an X [close]
And can only be closed with the menu options or by ctrl+shift+k.
Con Bloated as Windows 10
Windows Photo Viewer takes almost 30 seconds to open in a high end computer. That's embarrassing.
Con Runs very slow
And sometimes cause a timeout.
Con Integration with Microsoft services = No privacy
For example, it uses AI-powered facial recognition features and integrations with Cortana.
Con Auto improves RAW files that can't be turned off
And it is TERRIBLE!!!!
Con It lacks of tools for designers
The other image viewers have much more tools than this app...
Con Not cross platform
Exclusive for Windows 10.
Con Written in C# and XAML
Windows 10 UWP software tend to perform worse than software written in C++.