PDF Quartz Rendering quality

On the iPad, I need to render a large pdf (more than 1gb). For this I use Quartz.

Now everything works fine except the quality of included p开发者_高级运维df in my pdf.

I'm using CGContextDrawPDFPage to render the pdf into the UIView context (in drawRect).

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Found it.

CGContextSetInterpolationQuality(ctx, kCGInterpolationHigh);

Before drawing the pdf page and everything is fine.