Image scaling

I have a PNG image that has DPI set to 71 but my screen has DPI set to 96.
This is why WPF scales the images about 30% bigger (92/71 = 1,3)
This happens even if I set Stretch to None

<Page>
<Image Stretch="None" Source="Sample.png"/>
</Page>

I want WPF to render image exactly on the width of image in pixels. How to
do that?

- Jaska

Hi,

Jaska wrote:
> I have a PNG image that has DPI set to 71 but my screen has DPI set to 96.
> This is why WPF scales the images about 30% bigger (92/71 = 1,3)
> This happens even if I set Stretch to None
>
> <Page>
> <Image Stretch="None" Source="Sample.png"/>
> </Page>
>
> I want WPF to render image exactly on the width of image in pixels. How to
> do that?
>
> - Jaska

You can force the width and height of the image by using the Width and
Height properties. Note however that WPF doesn't use pixels as units,
but "Device independent units". So if you set to a (theoretical) width
of 10, it means 10/96 inches, not 10 pixels. This is designed to allow
you to have your application look exactly the same whatever the user's
screen resolution is set to.

HTH,
Laurent
--
Laurent Bugnion, GalaSoft
Software engineering: http://www.galasoft-LB.ch
Private/Malaysia: http://mypage.bluewin.ch/lbugnion
Support children in Calcutta: http://www.calcutta-espoir.ch

Hi,

Jaska wrote:
> I have a PNG image that has DPI set to 71 but my screen has DPI set to 96.
> This is why WPF scales the images about 30% bigger (92/71 = 1,3)
> This happens even if I set Stretch to None
>
> <Page>
> <Image Stretch="None" Source="Sample.png"/>
> </Page>
>
> I want WPF to render image exactly on the width of image in pixels. How to
> do that?
>
> - Jaska

You can force the width and height of the image by using the Width and
Height properties. Note however that WPF doesn't use pixels as units,
but "Device independent units". So if you set to a (theoretical) width
of 10, it means 10/96 inches, not 10 pixels. This is designed to allow
you to have your application look exactly the same whatever the user's
screen resolution is set to.

HTH,
Laurent
--
Laurent Bugnion, GalaSoft
Software engineering: http://www.galasoft-LB.ch
Private/Malaysia: http://mypage.bluewin.ch/lbugnion
Support children in Calcutta: http://www.calcutta-espoir.ch