When comparing Irfanview vs Flameshot, the Slant community recommends Irfanview for most people. In the question“What are the best screen capture tools for Windows?” Irfanview is ranked 13th while Flameshot is ranked 14th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Some editing tools included (cropping, color correcting, etc...)
Pro Lots of plugins available
Plugins can be found here.
Pro Batch processing
Even exif information can be batch processed.
Pro Recognizes virtually any image format
Pro You can just scroll with your mouse to explore images
Pro Ultra fast
If you press and hold the right-arrow button (for displaying the next image), you can watch images pass by as if they are a video, it's that fast. No stuttering, it loads images as fast as your hard drive can keep up.
Pro Lightweight
Pro Can use 8bf (Photoshop) filters
Pro Easy updates
Very easy to update the program and its associated plugins.
Pro Irfanview Thumbnail Viewer is a convenient way to view all image files easily
Irfanview Thumbnail Viewer is a great way to view thumbnails of all image files, including thumbnails of WMF files which Windows cannot natively display.
Pro Pin tool
Pin screenshots on screen so that you won't have to scroll up and down to find something in a long document all the time.
Pro Edit and copy on the fly
Write texts, draw rectangles, circles, and arrows on a screenshot and copy all on the fly or save the edited picture to disk. You can change colors, sizes and widths of all the elements the tool provides.
Pro Upload to Imgur
Take a screenshot and upload to Imgur with a click.
Cons
Con GIF viewing is buggy
GIF viewing has longstanding problems like flickering, incorrect framerate or artifacts, and it is very unlikely that it will be ever fixed.
Con Irfanview Thumbnail Viewer crashes on accessing AVI files
For some reason, the Irfanview Thumbnail Viewer crashes when it tries to access any .AVI movie file.
Con No transparency support
The alpha is converted to the selected background color upon opening a picture. When saving the picture again, you can select a color which is converted to alpha again.
Con Missing some utilities
Like browsing files utility.
Con Preferences are hard to find
Con Windows only
Con UI is far from ideal
Sometimes the interface is confusing.
Con No delay for area shot
It can not add a delay for an area shoot.