Thanks Keith, that worked perfectly. On Thu, Mar 4, 2010 at 12:28 PM, Keith Blount <[email protected]> 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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