Re: PNG image displayed larger in wx widget without any scale change

Hi,

Do you use a non-standard DPI? Like 125% or 150% scaling in Windows.
The 100% in paint is really unreliable with this. See my attached 
picture where I made a screenshot of the widgets sample (fullscreen 
1920x1040 on a monitor with normal/100% scaling).
Then I past it in paint (same monitor, also fullscreen 1920x1040). You 
would expect it to fill (even overfill) the entire paint window, but it 
fills only 2/3ths.
Even though it shows the correct number of pixels, and 100%, it is too 
small. This probably happens because the scaling of my main monitor is 150%.

tldr: you can't trust the 100% in paint.

Secondly, images in wxStaticBitmap will automatically scale to the 
display DPI when per-monitor DPI is enabled.

Maarten


On 12-5-2023 13:19, Alexandra Grigoras wrote:
> Hi all,
>
> I have a problem figuring out why PNG image is displayed larger in a 
> wx widget than its actual size without making any scale change(Python 
> 3.10, wxpython 4.2.0, Windows 10). I have tried 
> wx.ScrolledWindow/wx.Panel with wxStaticBitmap, 
> wx.lib.statbmp.GenStaticBitmap and overwrite of 
> wx.lib.statbmp.GenStaticBitmap's OnPaint method and debugged height, 
> width and scale members on every object up to wx.DC and I have not 
> found any explanation: height and width are actual height and width  
> the image and scale is 1.0. I have attached picture where in left size 
> is image with its real size and in right side is how it is displayed 
> in wx.ScrolledWindow.
> I would need first to understand why PNG image is displayed larger in 
> a wx widget than its actual size and second to display PNG image in 
> wx.ScrolledWindow at its actual real size.
>
> Regards and thank you in advance,
> Alexandra
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