pdf_setgray double values start at 0 for black and end at 1 for white so for any shade of gray simply pick a value inbetween these 2 numbers
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PDF_setgrayОписаниеbool PDF_setgray ( resource p, float g )Sets the current fill and stroke color to a gray value between 0 and 1 inclusive. Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки. This function is deprecated since PDFlib version 4, use PDF_setcolor() instead.  add a note
User Contributed NotesPDF_setgray
leea at digitus dot com dot au
29-Jan-2001 07:37
pdf_setgray double values start at 0 for black and end at 1 for white so for any shade of gray simply pick a value inbetween these 2 numbers
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PDF_setgray_stroke