mod_chxj

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treedepth = 4 で対処する

diff --git a/src/chxj_img_conv_format.c b/src/chxj_img_conv_format.c
index 0ed36a8..91b0949 100644
--- a/src/chxj_img_conv_format.c
+++ b/src/chxj_img_conv_format.c
@@ -1456,7 +1456,7 @@ s_fixup_color(MagickWand *magick_wand, request_rec *r, device_table *spec, img_c
     if (MagickQuantizeImage(magick_wand,
                            spec->color,
                            RGBColorspace,
-                           0,
+                           4,   /* tree depth of 4 */
                            1,
                            0) == MagickFalse) {
       EXIT_MAGICK_ERROR();
@@ -1472,7 +1472,7 @@ s_fixup_color(MagickWand *magick_wand, request_rec *r, device_table *spec, img_c
     if (MagickQuantizeImage(magick_wand,
                            spec->color,
                            GRAYColorspace,
-                           0,
+                           4,   /* tree depth of 4 */
                            1,
                            0) == MagickFalse) {
       EXIT_MAGICK_ERROR();