Don't allow a bit depth of 1.

1 files changed, 1 insertions, 1 deletions

diff --git a/main.c b/main.c
index f4912de..7558f96 100644
--- a/main.c
+++ b/main.c
@@ -206,7 +206,7 @@ parse_options(options_t *options, int argc, char *argv[])
 
     if (parse_arg(argc, argv, "-b", "--bit-depth", &value, &i, &error)) {
       if (!str_to_uint(value, &options->bit_depth)
-          || options->bit_depth <= 0
+          || options->bit_depth <= 1
           || options->bit_depth > 24) {
         fprintf(stderr, "Invalid bit depth: `%s'\n", value);
         error = true;