Save as PDF/X-3/4/5 error with pdflib

本文链接：https://blog.youkuaiyun.com/u012905879/article/details/48780725

本文详细解析了在使用pdflib进行PDF/X-3/4/5导出时，由于颜色空间与输出意图不匹配导致的错误。通过设置ICC配置文件并调整输出意图，成功解决了无法打开或文件为空的问题。重点讨论了PDF/X系列的特殊限制与应用注意事项。

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【现象】Save as PDF/X-3/4/5，导出的pdf错误，打不开，文件是空的。

【原因】

我们设置的文字颜色是RGB Color Space，但是我们设置的PDF/X-3/4/5默认的output intent是CMYK的Color Space，所以调用fit_textline函数写文字时，就会抛异常“RGB Color Space requires suitable output intent in pdf/x-3/4/5”。

PDF/X是PDF的一种特殊规格，它比普通PDF规格多一些限制，详见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.

【解决办法】

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(""));
 }