From c79ee4b56f81fb3afbaf68ce96308ba52eed9a62 Mon Sep 17 00:00:00 2001 From: ValdikSS Date: Wed, 29 Oct 2025 21:54:45 +0300 Subject: [PATCH] Update README.md to clarify Poppler grayscale warning message (#662) --- README.md | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/README.md b/README.md index ce521bcb0..d4adf8e45 100644 --- a/README.md +++ b/README.md @@ -174,6 +174,12 @@ DeviceRGB, DeviceGray, RGB or sGray and is not capable of generating PostScript level 1. So its support is only experimental and distributions should not choose it as default. +Poppler does not explicitly support turning colored PDF files into +grayscale PostScript, that's why grayscale/monochrome printing +could result in color output. +Use alternative backends, such as Ghostscript or MuPDF, if this is +the case with your printer. + The selection is done by the "pdftops-renderer" option, setting it to "gs", "pdftops", "pdftocairo", "acroread", "mupdf", or "hybrid": -- 2.47.3