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diff --git a/cinelerra-5.0/plugins/bluedottheme/data/bgcolor.c b/cinelerra-5.0/plugins/bluedottheme/data/bgcolor.c
new file mode 100644
index 00000000..ee433332
--- /dev/null
+++ b/cinelerra-5.0/plugins/bluedottheme/data/bgcolor.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+//for f in picture.png scope.png; do
+//  pngtopam -alpha < $f > /tmp/a
+//  pngtopnm < $f | /tmp/a.out > /tmp/b
+//  pnmtopng -alpha=/tmp/a < /tmp/b > /tmp/data1/$f
+//done
+int main(int ac, char **av)
+{
+	int r, g, b;
+	char line[1024];
+	do {
+		fputs(fgets(line,sizeof(line),stdin),stdout);
+	} while( strcmp(line,"255\n") );
+	while( (r=getc(stdin)) >= 0 && (g=getc(stdin)) >= 0 && (b=getc(stdin)) >= 0 ) {
+		double rr = r/255., gg = g/255., bb = b/255.;
+		int y = (int)(( 0.29900*rr + 0.58700*gg + 0.11400*bb)*255. + 0.5);
+		int u = (int)((-0.16874*rr - 0.33126*gg + 0.50000*bb + 0.5) * 255. + 0.5);
+		int v = (int)(( 0.50000*rr - 0.41869*gg - 0.08131*bb + 0.5) * 255. + 0.5);
+		if( abs(u-0x80) < 2 && abs(v-0x80) < 2 && y <= 0x48 )
+			if( (y += 0x100-0x48) >= 0x100 ) y = 0x100-1;
+		double yy = y/255., uu = (u-128)/255., vv = (v-128)/255.;
+		r = (int)((yy + 1.40200*vv) * 255. + 0.5);
+		g = (int)((yy- 0.34414*uu - 0.71414*vv) * 255. + 0.5);
+		b = (int)((yy+ 1.77200*uu) * 255. + 0.5);
+		putc(r, stdout); putc(g, stdout); putc(b, stdout);
+	}
+	return 0;
+}