Re: Anti-aliasing in Snow Leopard (10.6) PDFView
Re: Anti-aliasing in Snow Leopard (10.6) PDFView
- Subject: Re: Anti-aliasing in Snow Leopard (10.6) PDFView
- From: Andy Mroczkowski <email@hidden>
- Date: Thu, 4 Mar 2010 12:43:16 -0500
Thanks Keith, that worked perfectly.
On Thu, Mar 4, 2010 at 12:28 PM, Keith Blount <email@hidden> wrote:
> Not sure if this is the same thing, but I recently ran into something similar - a scanned-in newspaper looked terrible and grainy in my app, although Preview handled it smoothly. The solution was to override -drawPage: in a PDFView subclass and set it to use high interpolation if anti-aliasing is turned on, as follows:
>
> - (void)drawPage:(PDFPage *)pdfPage
> {
> [NSGraphicsContextsaveGraphicsState];
>
> // Certain PDF files may appear very grainy (low quality) with the default image interpolation. If anti-aliasing is turned on, we therefore
> // make interpolation high.
> // NOTE: I got this fix from Skim.app's source code, so a credit to http://skim-app.sourceforge.net/ goes in the About box.
> [[NSGraphicsContextcurrentContext] setImageInterpolation:([selfshouldAntiAlias] ? NSImageInterpolationHigh: NSImageInterpolationDefault)];
>
> [super drawPage: pdfPage];
> [NSGraphicsContextrestoreGraphicsState];
> }
>
> (As you can see from the code comments, the developers are Skim are the ones who came up with the solution, not me.)
>
> I couldn't see much difference with the PDF you placed in Dropbox, but from the comparison image you posted it does look like the same thing.
>
> Hope that helps.
>
> All the best,
> Keith
>
>
>
>
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