From 25f69fceb87f72beedf73620a476a2a86d2cef02 Mon Sep 17 00:00:00 2001
From: Peter <peter.dyumin@gmail.com>
Date: Wed, 1 Feb 2023 21:30:14 +0300
Subject: [PATCH 1/2] Fix Sobel filter color encoding

---
 processing/sobel-filter.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/processing/sobel-filter.go b/processing/sobel-filter.go
index f22c8b3..8811a25 100644
--- a/processing/sobel-filter.go
+++ b/processing/sobel-filter.go
@@ -39,9 +39,9 @@ func SobelFilter(source [][]color.Color) [][]color.Color {
 					gradientY += int(grayColor) * sobelVertical[i][j]
 				}
 			}
-			colorCode := 255 - uint8(int(math.Sqrt(
-				float64((gradientX*gradientX)+(gradientY*gradientY)),
-			)))
+			colorCode := 255 - uint8(utilities.MaxMin(math.Sqrt(
+				float64(gradientX*gradientX+gradientY*gradientY),
+			), 255, 0))
 			destination[x][y] = color.RGBA{colorCode, colorCode, colorCode, 255}
 		}
 	}

From add2b1a00f8a074a68fac6528e2246b4bb6fe347 Mon Sep 17 00:00:00 2001
From: Peter <peter.dyumin@gmail.com>
Date: Fri, 3 Feb 2023 21:47:32 +0300
Subject: [PATCH 2/2] Update Laplacian kernel, fix color calculation

---
 processing/laplasian-filter.go | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/processing/laplasian-filter.go b/processing/laplasian-filter.go
index 7535429..007ea15 100644
--- a/processing/laplasian-filter.go
+++ b/processing/laplasian-filter.go
@@ -2,16 +2,15 @@ package processing
 
 import (
 	"image/color"
-	"math"
 
 	"github.com/julyskies/brille/constants"
 	"github.com/julyskies/brille/utilities"
 )
 
-var laplasianKernel = [3][3]int{
-	{0, -1, 0},
-	{-1, 4, -1},
-	{0, -1, 0},
+var laplacianKernel = [3][3]int{
+	{-1, -1, -1},
+	{-1, 8, -1},
+	{-1, -1, -1},
 }
 
 func LaplasianFilter(source [][]color.Color) [][]color.Color {
@@ -19,7 +18,7 @@ func LaplasianFilter(source [][]color.Color) [][]color.Color {
 	destination := utilities.CreateGrid(width, height)
 	for x := 0; x < width; x += 1 {
 		for y := 0; y < height; y += 1 {
-			gradientX := 0
+			averageSum := 0
 			for i := 0; i < 3; i += 1 {
 				for j := 0; j < 3; j += 1 {
 					k := utilities.GradientPoint(x, i, width)
@@ -28,13 +27,11 @@ func LaplasianFilter(source [][]color.Color) [][]color.Color {
 						source[x+k][y+l],
 						constants.GRAYSCALE_AVERAGE,
 					)
-					gradientX += int(grayColor) * laplasianKernel[i][j]
+					averageSum += int(grayColor) * laplacianKernel[i][j]
 				}
 			}
-			colorCode := 255 - uint8(int(math.Sqrt(
-				float64((gradientX * gradientX)),
-			)))
-			destination[x][y] = color.RGBA{colorCode, colorCode, colorCode, 255}
+			channel := 255 - uint8(utilities.MaxMin(averageSum, 255, 0))
+			destination[x][y] = color.RGBA{channel, channel, channel, 255}
 		}
 	}
 	return destination