20260629222128

code/app/.workbuddy/make_compare.py

@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+from PIL import Image, ImageDraw
+
+src = r"D:\workspace\code\app\.workbuddy\hongbao.webp"
+img = Image.open(src).convert("RGBA")
+w, h = img.size
+tile = 16
+
+# Panel 1: checkerboard background (shows transparency)
+def make_checker(width, height, t):
+    cb = Image.new("RGB", (width, height), (255, 255, 255))
+    d = ImageDraw.Draw(cb)
+    for y in range(0, height, t):
+        for x in range(0, width, t):
+            if (x // t + y // t) % 2 == 0:
+                d.rectangle([x, y, x + t - 1, y + t - 1], fill=(204, 204, 204))
+    return cb
+
+checker = make_checker(w, h, tile).convert("RGBA")
+panel1 = Image.alpha_composite(checker, img).convert("RGB")
+
+# Panel 2: white background
+white_bg = Image.new("RGBA", (w, h), (255, 255, 255, 255))
+panel2 = Image.alpha_composite(white_bg, img).convert("RGB")
+
+# Panel 3: alpha channel as grayscale (white = opaque, black = transparent)
+alpha = img.split()[3]
+panel3 = Image.merge("RGB", (alpha, alpha, alpha))
+
+# Combine with labels
+gap = 10
+label_h = 28
+total_w = w * 3 + gap * 2
+total_h = h + label_h
+canvas = Image.new("RGB", (total_w, total_h), (245, 245, 245))
+canvas.paste(panel1, (0, label_h))
+canvas.paste(panel2, (w + gap, label_h))
+canvas.paste(panel3, (w * 2 + gap * 2, label_h))
+
+d = ImageDraw.Draw(canvas)
+d.text((4, 6), "Transparent bg (checker)", fill=(0, 0, 0))
+d.text((w + gap + 4, 6), "White bg", fill=(0, 0, 0))
+d.text((w * 2 + gap * 2 + 4, 6), "Alpha channel", fill=(0, 0, 0))
+
+out = r"D:\workspace\code\app\.workbuddy\hongbao_bg_compare.png"
+canvas.save(out)
+print("Saved:", out)