透明地从Draw文档导出pdf [英] Export pdf from Draw document with transparency

问题描述

我使用Libreoffice Draw绘制框图.我使用以下命令在命令行上自动导出它们:

I use Libreoffice Draw for drawing block diagrams. I export them automatically on the command line using the following command:

soffice --headless --convert-to pdf --outdir figures figures_raw/foo.odg

但是，不能保留透明度-背景始终为白色.如何将 odg 图纸转换为pdf，但保留透明度?

However, this does not preserve transparency - the background is always white. How to convert odg drawings to pdf but preserver the transparency?

推荐答案

但是，这不能保留透明度-背景始终为白色.

However, this does not preserve transparency - the background is always white.

按规范是这样.在PDF规范中，当涉及到透明度主题时，

This is so by specification. In the PDF specification, when covering the topic of transparency,

当前页面的概念被概括为指一个透明组，该透明组由页面上放置的整个对象堆栈组成，并与纯白色且完全不透明的背景组成.

the notion of current page is generalized to refer to a transparency group consisting of the entire stack of objects placed on the page, composited with a backdrop that is pure white and fully opaque.

(第11.2节透明度概述"，因此，PDF查看器程序或查看控件通常将显示带有白色不透明背景的PDF.

Thus, PDF viewer programs or viewing controls usually will display a PDF with a white, opaque background.

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