From eaf0c5da6e202aea25a891184671f2c76ee860a5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Osman=20Tun=C3=A7elli?= <otuncelli@users.noreply.github.com>
Date: Tue, 28 Sep 2021 04:51:37 +0300
Subject: [PATCH] PDF/A-1 doesn't allow transparency.

---
 src/UglyToad.PdfPig/Writer/PdfPageBuilder.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/UglyToad.PdfPig/Writer/PdfPageBuilder.cs b/src/UglyToad.PdfPig/Writer/PdfPageBuilder.cs
index da2de186..a16230e9 100644
--- a/src/UglyToad.PdfPig/Writer/PdfPageBuilder.cs
+++ b/src/UglyToad.PdfPig/Writer/PdfPageBuilder.cs
@@ -495,7 +495,7 @@
 
             IndirectReferenceToken smaskReference = null;
 
-            if (png.HasAlphaChannel)
+            if (png.HasAlphaChannel && documentBuilder.ArchiveStandard != PdfAStandard.A1B && documentBuilder.ArchiveStandard != PdfAStandard.A1A)
             {
                 var smaskData = new byte[data.Length / 3];
                 for (var rowIndex = 0; rowIndex < png.Height; rowIndex++)
@@ -917,4 +917,4 @@
 
         
     }
-}
\ No newline at end of file
+}