10.6.2: Bad image quality with SIPS

I used to convert my PDF documents with SIPS like this:
/usr/bin/sips --setProperty format jpeg --setProperty formatOptions high -z 400 200 sourcefilename.pdf --out targetfilename.jpg
This results in a very bad image quality after updating to 10.6.2 (the text contained in the source pdf file is nearly unreadable in the resulting image, especially when using the -z attribute for downsizing).
I could reconstruct this behaviour with several machines today: when using 10.6.1 the quality is fine, but after the update to 10.6.2 the resulting image quality is unacceptable.
Any ideas? Or could this be a bug? The man page for sips does not contain any information about new parameters and the image quality for other target formats (tif, png, ...) seems to be ok.

That picture looks like it was taken in a dimly lit room.
You could try using night mode but you will need a very steady hand.
Most basic phone cameras just cannot produce good pictures indoors when not in brightly lit areas.  LED flashes just cannot do a good enough job when compared to real cameras.
Megapixels don't equal quality, it's the lens and flash that make the biggest difference.

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