diff --git a/.gitignore b/.gitignore
index 1953332..bc9b289 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,11 +10,12 @@ Makefile
 *.obj
 *.exe
 *.out
-# 测试输出图片（由程序运行时生成）
-*.jpg
-*.png
-*.jpeg
-*.bmp
+# 测试输出图片（由各实验 build/ 目录下运行时生成）
+# 仅忽略 build 目录下的图片，images/ 目录下的素材图片不会被忽略
+build/**/*.jpg
+build/**/*.png
+build/**/*.jpeg
+build/**/*.bmp
 # IDE 文件
 .vscode/
 .idea/
diff --git a/images/exp1_sample.jpg b/images/exp1_sample.jpg
new file mode 100644
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diff --git a/images/exp2_colorful.jpg b/images/exp2_colorful.jpg
new file mode 100644
index 0000000..67d60f0
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diff --git a/images/exp3_texture.jpg b/images/exp3_texture.jpg
new file mode 100644
index 0000000..2f98d83
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diff --git a/images/exp4_edges.jpg b/images/exp4_edges.jpg
new file mode 100644
index 0000000..6056492
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diff --git a/images/exp5_brightness.jpg b/images/exp5_brightness.jpg
new file mode 100644
index 0000000..7528a7d
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diff --git a/images/exp6_shapes.jpg b/images/exp6_shapes.jpg
new file mode 100644
index 0000000..34cba88
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diff --git a/images/exp7_red.jpg b/images/exp7_red.jpg
new file mode 100644
index 0000000..2ff27ee
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diff --git a/images/exp8_complex.jpg b/images/exp8_complex.jpg
new file mode 100644
index 0000000..2e10e6f
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