From: ValdikSS <iam@valdikss.org.ru>
Date: Wed, 29 Oct 2025 18:54:45 +0000 (+0300)
Subject: Update README.md to clarify Poppler grayscale warning message (#662)
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;p=thirdparty%2Fcups-filters.git

Update README.md to clarify Poppler grayscale warning message (#662)
---

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":