From bfc0a282684332b151d4f8154027ad0b0dcba4d8 Mon Sep 17 00:00:00 2001
From: Syed Faaz <syedfaaz215@gmail.com>
Date: Sat, 23 Aug 2025 10:11:55 +0530
Subject: [PATCH] Add example: pixel grid overlay on image

---
 .../images_contours_and_fields/pixel_grid.py  | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 galleries/examples/images_contours_and_fields/pixel_grid.py

diff --git a/galleries/examples/images_contours_and_fields/pixel_grid.py b/galleries/examples/images_contours_and_fields/pixel_grid.py
new file mode 100644
index 000000000000..bfcc902e6dcf
--- /dev/null
+++ b/galleries/examples/images_contours_and_fields/pixel_grid.py
@@ -0,0 +1,64 @@
+"""
+=========================
+Image with Pixel Grid Overlay
+=========================
+
+This example shows how to overlay a pixel-aligned grid on an image in Matplotlib.
+Such grids can be useful for teaching, image analysis, or visual inspection.
+"""
+
+import numpy as np
+import matplotlib.pyplot as plt
+from PIL import Image
+
+
+def pixel_grid(image, cell_size=50, grid_color="gray", grid_width=0.5):
+    """
+    Display an image with a pixel grid overlay.
+
+    Parameters
+    ----------
+    image : str or ndarray
+        Path to an image file or a NumPy array representing the image.
+    cell_size : int, default=50
+        Spacing between grid lines, in pixels.
+    grid_color : str, default='gray'
+        Color of the grid lines.
+    grid_width : float, default=0.5
+        Thickness of the grid lines.
+    """
+    # Load image from file or array
+    if isinstance(image, str):
+        img = Image.open(image).convert("RGB")
+    else:
+        img = Image.fromarray(image)
+
+    width, height = img.size
+
+    fig, ax = plt.subplots(figsize=(8, 6))
+    ax.imshow(img)
+
+    # Vertical grid lines
+    for x in range(0, width, cell_size):
+        ax.axvline(x, color=grid_color, linewidth=grid_width)
+
+    # Horizontal grid lines
+    for y in range(0, height, cell_size):
+        ax.axhline(y, color=grid_color, linewidth=grid_width)
+
+    # Set limits and aspect ratio
+    ax.set_xlim([0, width])
+    ax.set_ylim([height, 0])  # flip Y-axis
+    ax.set_aspect("equal")
+
+    ax.set_title("Image with Pixel Grid Overlay")
+
+    plt.show()
+
+
+# Example usage with synthetic image
+if __name__ == "__main__":
+    # Create a synthetic grayscale image (200x300 pixels)
+    img = np.random.randint(0, 255, (200, 300), dtype=np.uint8)
+
+    pixel_grid(img, cell_size=40, grid_color="red", grid_width=1.0)
\ No newline at end of file