【現象】Save as PDF/X-3/4/5，導出的pdf錯誤，打不開，文件是空的。

【原因】

我們設置的文字顏色是RGB Color Space，但是我們設置的PDF/X-3/4/5默認的output intent是CMYK的Color Space，所以調用fit_textline函數寫文字時，就會拋異常“RGB Color Space requires suitable output intent in pdf/x-3/4/5”。

PDF/X是PDF的一種特殊規格，它比普通PDF規格多一些限制，詳見Wiki。

以下是pdflib列出的一些PDF/X的限制：

PDF/X Some options are restricted.

PDF/X-1a: RGB images are notallowed.

PDF/X-1a/3: JBIG2 images are notallowed.

PDF/X-3/4/5: Grayscale imagesrequire that the defaultgray option in PDF_begin_page_

ext( ) must have been set unless theoutput intent is a grayscale or CMYK device.

RGB images require that thedefaultrgb option in PDF_begin_page_ext( ) must have

been set unless the output intent isan RGB device.

CMYK images require that thedefaultcmyk option in PDF_begin_page_ext( ) must

have been set unless the outputintent is a CMYK device.

JPEG 2000 images must satisfycertain conditions; see PDFlib Tutorial for details.

【解決辦法】

if(g_lPDFSyle== NS_PDF_X3 || g_lPDFSyle == NS_PDF_X4 || g_lPDFSyle == NS_PDF_X5){TCHARoptlist[MAX_PATH]=_T("");int icc = pPdf->load_iccprofile(TEXT("sRGB"), _T(""));_stprintf(optlist,_T("defaultrgb=%d"), icc);pPdf->begin_page_ext(fPageW,fPageH,optlist);}else{pPdf->begin_page_ext(fPageW,fPageH,_T(""));}

?

總結

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