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Filename : PPI_CUtils

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%%
%% Idioms for the PPI Media GmbH PPI_ColorUtils ProcSet
%% This appears to be a kind of desktop colour separation utility. If it is
%% used with the pdfwrite PassThroughJPEGImages feature then instead of
%% converting images from colour to gray, we embed the colour image data
%% but with a DeviceGray colour space, which leads to incorrect output.
%% To fix that, turn off the feature if cuForceGray is set to true. This
%% is the first time we've seen this, and more work may be required.
%%

currentuserparams /IdiomRecognition get
<</IdiomRecognition false>> setuserparams

/PPI_CUtils
<<
/cuForceGray [
{/_cuForceGray exch cuPut} bind
{dup //true eq {currentdevice //null //false mark /PassThroughJPEGImages //false .putdeviceparamsonly}if /_cuForceGray exch cuPut} bind
]
>>

/IdiomSet defineresource pop

<</IdiomRecognition 3 -1 roll>> setuserparams