Problem with picking up pixel value

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C

Windows

Hey guys! I'm new in this forum. I have a problem with a function I wrote to pick up pixel values from a .bmp image file. When I try to read the 10th byte of the file(which indicates the beginning of the image's information), it's allright. But when I try to read the first pixel I get a -92 as value from the fread() function. Can you please help me to fix my code?

void get_pixels(char path[]){
int i, j=0;
int offset;
char depth;
FILE *fp;
char bmp[5];
	
	for(i=strlen(path)-4;i<strlen(path);i++){
		bmp[j]=path[i];
		j++;
	}
	if(strstr(bmp, ".bmp")==NULL){
		printf("\nIndicare un file .bmp come immagine!\n");
		exit(1);
	}
	
	fp = fopen(path, "rb");
	
	fseek(fp, 28, SEEK_SET);
	fscanf(fp, "%c", &depth);
	
	if(depth!=8){
		printf("\nSelezionare una immagine a 8 bit!\n");
		exit(2);
	}
	
	fseek(fp, 10, SEEK_SET);
	fread(&offset, sizeof(offset), 1, fp);
	printf("\n%d", offset);
	
	fseek(fp, offset, SEEK_SET);
	fread(&pixels[0], sizeof(char), 1, fp);
	printf("\n%d", pixels[0]);
	
	fclose(fp);
}

Sorry for my english, I'm italian... :D