Scanning image pixels

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This code checks 2 images’ pixels, compares each pixels based on the threshold (<= 7), finds a best fitting watermark image from the system given 6 images, and loads that image next to the cover image.

For a 100*100 watermark image this particular code takes nearly 130 secs to give output.

Please suggest some ways to optimize it regarding execution time.

namespace Watermarking
public partial class Embedding_Pixels_Evaluation : Form
private Stopwatch sp;

public Embedding_Pixels_Evaluation()
sp = new Stopwatch();
button1.Enabled = false;


//choose watermark from system
private void button2_Click(object sender, EventArgs e)
Boolean imageSize = false;
Boolean flag = false;

int[] count_miss = new int[6];
int[] count_hit = new int[6];

for (int cnt = 1; cnt <= 6; cnt++)

//sample watermarks saved in sampleimage folder
string curpath = Application.StartupPath.ToString() + @"sampleimage"


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