Comments on: WPF, Images, and DPI Independence

By: Marcello

Marcello — Wed, 11 Nov 2009 16:47:15 +0000

Is there a way to use this in an ImageBrush?

By: hbdiere

hbdiere — Wed, 20 May 2009 09:21:35 +0000

I tried this out and it worked well. This was exactly what I was looking for! Thank you

By: Heartburn Home Remedy

Heartburn Home Remedy — Wed, 15 Apr 2009 11:27:41 +0000

My friend on Facebook shared this link and I’m not dissapointed that I came to your blog.

By: genesisconduit

genesisconduit — Wed, 25 Mar 2009 15:46:55 +0000

@ Jay

File formats such as PNG and JPG store physical dimensions and therefore DPI. You can save the images as 96 DPI images and they’ll display at their original pixel size in WPF.

By: Jay

Jay — Wed, 25 Mar 2009 11:35:55 +0000

DPI is a measure of a display device not a measure of the image. If you examine image storage formats you find almost none of them will store a “DPI” value. Only targa, that I’m aware of, will store anything. If you read the specs for targa you find it’s a ’suggestion for the presentation’ of the image.

No images ever have a default DPI. You might have an expectation based on your past usage but that’s not the same.

Defaulting to 96 DPI was a stupid mistake. Almost every monitor in the world is somewhere around 72 DPI, and windows can usually interrogate the display device for it’s size settings.

WPF is not polished and this is one of the teething problems.

By: Jay Liu

Jay Liu — Fri, 16 Jan 2009 20:52:32 +0000

This is exactly what I needed. Thank you for posting this!

By: Scott Hanselman's Computer Zen - Be Aware of DPI with Image PNGs in WPF - Images Scale Weird or are Blurry

Tue, 06 Jan 2009 08:23:11 +0000

[...] so when it encounters the 72 dpi image it scales it up. If you can’t change the image, there are funky ways around it. Personally, I believe if you are running into this because of a designer/developer mismatch, then [...]