IrfanView 4.62 64bit for Windows, default settings.
If portrait-oriented image has vertical resolution higher than desktop, it takes all available vertical space when viewed in fullscreen mode.
When it is viewed in windowed mode, it is resized to smaller size than is vertically available on black area and has black bars on top and at the bottom of the image.
What's the reasoning behind such behavior of the program? Is there an option to change it to be similar to fullscreen mode? I couldn't find it.
Update.
It actually happens with large images of any orientation too, but only if viewer's window is maximized (that is, was clicked standard window's button on the left of closing button).
And when window isn't maximized, those black gaps are absent.
But here's another funny thing that happened.
I have clicked minimize button while large image was loaded, then window shrinked, black bars disappeared and appeared vertical scrollbar in viewer's window.
Then I maximized window again, black bars came back, and also vertical scrollbar remained in same position and size as it was on minimized window, just over the middle of the picture. Although I couldn't repeat it again and the scrollbar was inoperable.
Update 2.
It's more or less repeatable if before maximizing window you drag vertical scrollbar down.
If portrait-oriented image has vertical resolution higher than desktop, it takes all available vertical space when viewed in fullscreen mode.
When it is viewed in windowed mode, it is resized to smaller size than is vertically available on black area and has black bars on top and at the bottom of the image.
What's the reasoning behind such behavior of the program? Is there an option to change it to be similar to fullscreen mode? I couldn't find it.
Update.
It actually happens with large images of any orientation too, but only if viewer's window is maximized (that is, was clicked standard window's button on the left of closing button).
And when window isn't maximized, those black gaps are absent.
But here's another funny thing that happened.
I have clicked minimize button while large image was loaded, then window shrinked, black bars disappeared and appeared vertical scrollbar in viewer's window.
Then I maximized window again, black bars came back, and also vertical scrollbar remained in same position and size as it was on minimized window, just over the middle of the picture. Although I couldn't repeat it again and the scrollbar was inoperable.
Update 2.
It's more or less repeatable if before maximizing window you drag vertical scrollbar down.
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