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

Hi Maarten,

Indeed the display difference I see between my wxPython based tool and my 
eclipse based tool/Paint/other image editors is from scale and layout 
settings of my display of 125%. I have changed setting to 100% and now 
wxPython image display size is aligned with the rest of tools. I have 
noticed that when scale and layout settings higher than 100% only  wxPython 
image display size is larger, the rest of the tools display image at same 
size. Is there a way to keep same size for wxPython image display when 
changing display DPI?

Regards,
Alexandra

Pe vineri, 12 mai 2023, la 16:46:21 UTC+3, Maarten Bent a scris:

> 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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