In my opinion one thing would be very very important for a picture viewer in common, respectively XnView.
In the Image -> Resize window, you can "Keep ratio", but you can not "Keep document size" like in the "Set DPI"-action inside "Batch Processing". Photoshop for example has the ideal image resize dialogue. There's the double or triple bracket to keep ratio and/or document size, so you have full control over picture size in co-operation with DPI. It's often very important to automatically have the DPI adjusted when changing the image size.
If you would install a "Keep document size" controll box inside the resize dialogue it would be as perfect as in Photoshop.
I tested many picture viewers and no one has such a resize image dialogue. XnView here on more time has the chance to set apart from other picture viewers (Ok, I know, XnView already sets apart from the most picture viewers!).
By the way:
Once I tested a picture viewer which had one nice and useful thing:
It warned the user about low resolutions. When the resolution was under 200 DPI the DPI number color changed from black to green, and under 100 DPI the color changed to red. That's very nice for the mass of idiot - pardon - beginner users, who don't know much about computer programs
and only want to simply manage and handle their digital camera pictures. If the user could even customize and set those DPI warning limits in the preferences, it would have been perfect!
With kind regards
Thomas
