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https://bugs.gentoo.org/927137
https://github.com/OpenPrinting/cups-filters/issues/578
https://github.com/OpenPrinting/libcupsfilters/commit/78cc6758d98c31397c8addefaa3dfd8746331b72
From 78cc6758d98c31397c8addefaa3dfd8746331b72 Mon Sep 17 00:00:00 2001
From: zdohnal <zdohnal@redhat.com>
Date: Thu, 7 Mar 2024 18:27:06 +0100
Subject: [PATCH] raster.c: Always use sRGB/sGray if driver is PWG/URF and
RGB/Gray is requested (#51)
Some driverless printers (EPSON L3160 in Fedora report) stopped working
after commit c6175a2 if `ColorModel=RGB` is passed as option. A
different CUPS color space is assigned with the fix - CUPS_CSPACE_RGB,
which results in no ICC profile being assigned into Ghostscript command
line.
Probably we can try other .icc profiles with CUPS_CSPACE_RGB (srgb.icc
does not work with RGB color space), but I tested with reporter that
using sRGB space + srgb.icc works for the printer - so the patch is to
use sRGB if the driver is URF/PWG.
Same logic applied for grayscale printing, if Gray is requested, sGray is
used for URF/PWG.
---
cupsfilters/raster.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/cupsfilters/raster.c b/cupsfilters/raster.c
index e9a8ad1f..7b62b922 100644
--- a/cupsfilters/raster.c
+++ b/cupsfilters/raster.c
@@ -1550,7 +1550,7 @@ raster_base_header(cups_page_header_t *h, // O - Raster header
{
if (*(val + 4) == '_' || *(val + 4) == '-')
ptr = val + 5;
- colorspace = 18;
+ colorspace = pwg_raster ? 18 : 3;
numcolors = 1;
}
else if (is_color && !strncasecmp(val, "Srgb", 4))
@@ -1571,7 +1571,7 @@ raster_base_header(cups_page_header_t *h, // O - Raster header
{
if (*(val + 3) == '_' || *(val + 3) == '-')
ptr = val + 4;
- colorspace = 1;
+ colorspace = pwg_raster ? 19 : 1;
numcolors = 3;
}
else if (!strcasecmp(val, "auto"))
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