Pipelining to custom GS delegate fails

[divis]

Hi,

I created a delegate for CMYK-PDF to transparent PNG Conversion:

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<delegate decode="pdf2png" command=""/opt/local/bin/gsx" -q -dQUIET -dPARANOIDSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r%x" -dUseCIEColor "-sOutputFile=%o" "-f%i""/>

inputfile is a CMYK PDF.

Following works just fine:

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convert -units PixelsPerInch -density 300x300 pdf2png:inputfile -background "#ff9900" -flatten -thumbnail 256x256 -units PixelsPerInch -density 72x72 png:-

But piping the document fails:

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cat inputfile | convert -units PixelsPerInch -density 300x300 pdf2png:- -background "#ff9900" -flatten -thumbnail 256x256 -units PixelsPerInch -density 72x72 png:-

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Error: /undefinedfilename in (/var/folders/QK/QKoi7mXGFy8q+AUGTEFlwk+++TI/-Tmp-/magick-J6cWQkiJ)
delegate failed `"/opt/local/bin/gsx" -q -dQUIET -dPARANOIDSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r%x" -dUseCIEColor "-sOutputFile=%o" "-f%i"'
convert: unable to open image `/var/folders/QK/QKoi7mXGFy8q+AUGTEFlwk+++TI/-Tmp-/magick-6Z7xdGmO': No such file or directory @ error/blob.c/OpenBlob/2491.
convert: unable to open file `/var/folders/QK/QKoi7mXGFy8q+AUGTEFlwk+++TI/-Tmp-/magick-6Z7xdGmO': No such file or directory @ error/constitute.c/ReadImage/571.
convert: missing an image filename `png:-' @ error/convert.c/ConvertImageCommand/2970.

I'm using IM 6.6.2-0, GS 8.71, Mac OS X 10.6.3

I searched all the forums and docs but didn't get it - any help or hint is highly appreciated.