我正在尝试生成有效的 PDF/X1-A 文档。我想从通过 PDF 验证的最简单的文档开始。这是我目前拥有的，以及 PDFBox 报告的当前错误集preflight-app-1.8.16.jar。
我也尝试过重复使用此主题但我遇到了大多数相同的错误。也许自 2015 年左右以来有些事情发生了变化？
我肯定我做错的事情有很多，有人能帮忙吗？谢谢！
最小.tex：
\documentclass[cmyk]{article}
\usepackage[x-1a]{pdfx}
\usepackage{hyperref}
\begin{document}
Hello, world!
\end{document}
最小.xmp数据：
\Title {Minimal Example}
\Author {Me, myself and I}
\Copyright {Copyright \copyright\ 2018 "Me, myself and I, inc."}
\Keywords {minimal\sep
pdf\sep
example}
\Subject {A minimal example of a valid PDF/X-1A document.}
使用（版本 3.14159265-2.6-1.40.18）进行编译后pdflatex，输出preflight：
The fileminimal.pdf is not valid, error(s) :
2.1.3 : Invalid Graphis object, The S entry of the OutputIntent isn't GTS_PDFA1
2.4.2 : Invalid Color space, The operator "K" can't be used with RGB Profile
2.4.3 : Invalid Color space, The operator "g" can't be used without Color Profile
2.4.3 : Invalid Color space, The operator "G" can't be used without Color Profile
2.4.2 : Invalid Color space, The operator "k" can't be used with RGB Profile
2.4.2 : Invalid Color space, The operator "K" can't be used with RGB Profile
2.4.2 : Invalid Color space, The operator "k" can't be used with RGB Profile
2.4.2 : Invalid Color space, The operator "K" can't be used with RGB Profile
2.4.2 : Invalid Color space, The operator "k" can't be used with RGB Profile
2.4.2 : Invalid Color space, The operator "K" can't be used with RGB Profile
7.11 : Error on MetaData, PDF/A identification schema http://www.aiim.org/pdfa/ns/id/ is missing