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-rw-r--r--source/pdf/pdf-op-buffer.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/source/pdf/pdf-op-buffer.c b/source/pdf/pdf-op-buffer.c
index 69707843..95edea46 100644
--- a/source/pdf/pdf-op-buffer.c
+++ b/source/pdf/pdf-op-buffer.c
@@ -599,6 +599,8 @@ pdf_out_BI(fz_context *ctx, pdf_processor *proc, fz_image *img)
fz_write_string(ctx, out, "/CS/CMYK\n");
else if (fz_colorspace_is_indexed(ctx, img->colorspace))
fz_write_string(ctx, out, "/CS/I\n");
+ else
+ fz_throw(ctx, FZ_ERROR_GENERIC, "BI operator can only show mask, Gray, RGB, CMYK, or Indexed images");
if (img->interpolate)
fz_write_string(ctx, out, "/I true\n");
fz_write_string(ctx, out, "/D[");