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deleted file mode 100644
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diff --git a/src/main/java/DecreaseGrayLevels.java b/src/main/java/DecreaseGrayLevels.java
new file mode 100644
index 0000000000000000000000000000000000000000..6ed47528643c98ba3b3f84b57f435a6eb84f510f
--- /dev/null
+++ b/src/main/java/DecreaseGrayLevels.java
@@ -0,0 +1,49 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class DecreaseGrayLevels implements transform {
+
+ private final double nbGrayLevels;
+
+ public DecreaseGrayLevels(int nbGrayLevels) {
+ this.nbGrayLevels = nbGrayLevels;
+ }
+
+ @Override
+ public void applyTo(GrayImage image) {
+ for (int i = 0; i < image.getWidth(); i++) {
+ for (int j = 0; j < image.getHeight(); j++) {
+ double gray = findGray(image.getPixelGrayColor(i,j));
+ GrayColor newColor = new ByteGrayColor(gray);
+ image.setPixel(newColor, i, j);
+ }
+ }
+ }
+
+
+ public double findGray(GrayColor initialColor) {
+
+ double color = initialColor.getLuminosity();
+ List<Double> intervalList = intervalFinder();
+
+ for (int i = 1; i < this.nbGrayLevels; i++) {
+ if (color < intervalList.get(i))
+ return intervalList.get(i-1);
+ }
+ return 1.;
+ }
+
+ public List<Double> intervalFinder() {
+
+ double intervalGap = 1.0 / (this.nbGrayLevels - 1.0);
+ List<Double> intervalList = new ArrayList<>();
+
+ for (double i = 0; i < (nbGrayLevels); i += 1.0) {
+ double interval = 0.0 + intervalGap * i;
+ intervalList.add(interval);
+ }
+
+ return intervalList;
+ }
+
+}
diff --git a/src/main/java/Display.java b/src/main/java/Display.java
index d3fc6e7b6dfa6ba483bc85ef66271a9acf26710d..4a12bdda6af375e81ed7cd0fe033c13838e3ce0e 100644
--- a/src/main/java/Display.java
+++ b/src/main/java/Display.java
@@ -21,7 +21,7 @@ public class Display implements Initializable {
this.image = MatrixGrayImage.createImageFromPGMFile("images/luminy.pgm");
- transform transformation = new Invert();
+ transform transformation = new DecreaseGrayLevels(5);
transformation.applyTo(this.image);
diff --git a/src/test/java/DecreaseGrayLevelsTest.java b/src/test/java/DecreaseGrayLevelsTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..0c27202e6fc1607262ba0dcf06fa3052e783671a
--- /dev/null
+++ b/src/test/java/DecreaseGrayLevelsTest.java
@@ -0,0 +1,21 @@
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.*;
+import java.util.List;
+
+public class DecreaseGrayLevelsTest {
+
+ @Test
+ void intervalFinder_shouldReturnCorrectIntervals() {
+ DecreaseGrayLevels dgl = new DecreaseGrayLevels(3);
+ List<Double> intervals = dgl.intervalFinder();
+ assertThat(intervals).containsExactly(0.0, 0.5, 1.0);
+ }
+
+ @Test
+ void findGray_shouldReturnCorrectValue() {
+ DecreaseGrayLevels dgl = new DecreaseGrayLevels(5);
+ ByteGrayColor byte1 = new ByteGrayColor(1.);
+ Double find1 = dgl.findGray(byte1);
+ assertThat(find1).isEqualTo(1.);
+ }
+}