Re: Strange issue with PNG files

It's apparently not a 72ppi picture. Even though the image is 16x14 pixels,
at ~200ppi something 14 pixels high is only 5 points high.

You are getting the full image, and I bet if you took the NSImageRep and
asked *it* for -pixelsHigh or -pixelsWide you'd get the 14 and 16.

If you want to draw it pixel for pixel despite the high ppi, use
-pixelsHigh/-pixelsWide, create an NSSize of that size, and draw it
"scaled".

Avi

On Thu, Mar 4, 2010 at 1:58 PM, Eric Gorr <[email protected]> wrote:

> I am working with a PNG file and noticed something odd with it that I am
> hoping someone can explain since I am not familiar enough with the PNG file
> format at this time.
>
> Basically, when I use:
>
> fileImage = [[[NSImage alloc] initWithContentsOfFile:filePath]
> autorelease];
> NSSize imageSize = [fileImage size];
> NSLog( @"Have Image of size - %@", NSStringFromSize( imageSize ) );
>
> to read the image and then take a look at the result of [fileImage size], I
> am told the image is {5.76086, 5}.
>
> Now, the odd thing is that I know the image is 16x14. I can confirm this by
> opening the image with GraphicConverter.
>
> However, when I open the image with GraphicConverter, it opens the image up
> at ~36% of it's normal size. Now, ~36% of the normal size is {5.76086, 5} -
> at least I am assuming this isn't a coincidence.
>
> So, the question is, does anyone know what is going on here? How can I get
> NSImage to read the image in at the normal size instead of the smaller one?
>
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