First version out

It certainly is full of bug but the main goal is done so i'm kinda happy
^^

Makefile

@@ -1,6 +1,7 @@
 .PHONY: clean, mrproper
 CC = gcc
 CFLAGS = -g -Wall -Wextra -pedantic
+LIBS = -lm
 
 all: fisualizer
 
@@ -8,7 +9,7 @@ all: fisualizer
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 fisualizer: fisualizer.o
-	$(CC) $(CFLAGS) -o $@ $+
+	$(CC) $(CFLAGS) -o $@ $+ $(LIBS)
 
 clean:
 	rm -f *.o core.*

fisualizer.c

@@ -1,8 +1,10 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
+#include <math.h>
+
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 #include "stb_image_write.h"
-#include <string.h>
 
 FILE *fd;
 size_t file_sz;
@@ -12,7 +14,7 @@ char *filename_output;
 int main(int argc, char *argv[])
 {
 	argv++;
-	while(argc--){
+	while(--argc){
 
 		const char* filename = *argv++;
 		filename_output = malloc(sizeof(char) * strlen(filename) + 8);
@@ -33,9 +35,11 @@ int main(int argc, char *argv[])
 
 		canvas = calloc(256*256, sizeof(char));
 
+		double weight = (double)file_sz / 255; 
+
 		for (size_t i = 0; i < file_sz - 1; ++i) {
 			unsigned char at_pos = file_cnt[i], next_pos = file_cnt[i+1];
-			canvas[at_pos + next_pos * 256] = 255;
+			canvas[at_pos + next_pos * 256] += weight;
 		}
 
 		stbi_write_png(strcat(filename_output, ".out.png"), 256, 256, 1, canvas, 256);