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-rw-r--r--pnm/write.scm2
1 files changed, 2 insertions, 0 deletions
diff --git a/pnm/write.scm b/pnm/write.scm
index b41a0d9..75cd433 100644
--- a/pnm/write.scm
+++ b/pnm/write.scm
@@ -30,6 +30,8 @@
(write-string-u8 "P6\n"))
((pgm)
(write-string-u8 "P5\n"))
+ ((pbm)
+ (write-string-u8 "P4\n"))
(else
(error "(pnm write) pnm-write: Not supported type" (image-type image))))
(write-string-u8 (number->string (image-width image)))