fix inverting (Bilevel BW png) in pdf; fixes # 2059

jiapei100 · Oct 27, 2019 · 4a37cde · 4a37cde
1 parent 048f729
commit 4a37cde
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/api/pdfrenderer.cpp b/src/api/pdfrenderer.cpp
@@ -721,7 +721,12 @@ bool TessPDFRenderer::imageToPDFObj(Pix *pix,
   } else {
     switch (cid->spp) {
       case 1:
-        colorspace.str("  /ColorSpace /DeviceGray\n");
+        if (cid->bps == 1) {
+          colorspace.str("  /ColorSpace /DeviceGray\n"
+                         "  /Decode [1 0]\n");
+        } else {
+          colorspace.str("  /ColorSpace /DeviceGray\n");
+        }
         break;
       case 3:
         colorspace.str("  /ColorSpace /DeviceRGB\n");