每日备份 2026-03-27

2026-03-27 23:38:45 +08:00
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+# Outpainting
+
+Extend an image beyond its original borders.
+
+## How It Works
+
+1. Place original image on larger canvas
+2. Mask the empty areas (white = generate here)
+3. Describe what should appear in extended areas
+4. AI generates content matching style and context
+
+## Tools
+
+### DALL-E 2 (OpenAI)
+
+```python
+from openai import OpenAI
+from PIL import Image
+import io
+
+client = OpenAI()
+
+# Create extended canvas
+original = Image.open("photo.png")
+extended = Image.new("RGBA", (1024, 1024), (0, 0, 0, 0))
+extended.paste(original, (256, 256))  # Center original
+
+# Create mask (transparent = edit)
+mask = Image.new("RGBA", (1024, 1024), (255, 255, 255, 255))
+mask.paste(Image.new("RGBA", original.size, (0, 0, 0, 0)), (256, 256))
+
+response = client.images.edit(
+    model="dall-e-2",
+    image=to_bytes(extended),
+    mask=to_bytes(mask),
+    prompt="Continue the landscape with mountains in the distance"
+)
+```
+
+### Stable Diffusion Outpaint
+
+```python
+from diffusers import StableDiffusionInpaintPipeline
+
+# Same as inpainting, but with extended canvas
+# Original image centered, mask covers new areas
+
+pipe = StableDiffusionInpaintPipeline.from_pretrained(
+    "runwayml/stable-diffusion-inpainting",
+    torch_dtype=torch.float16
+)
+
+result = pipe(
+    prompt="expansive landscape, same style",
+    image=extended_image,
+    mask_image=outpaint_mask,
+    num_inference_steps=50
+).images[0]
+```
+
+### Photoshop Generative Fill
+
+1. Select > All
+2. Image > Canvas Size (increase dimensions)
+3. Select empty areas with Magic Wand
+4. Edit > Generative Fill
+5. Enter prompt or leave blank
+
+## Aspect Ratio Expansion
+
+**Portrait to Landscape:**
+- Extend left and right
+- Prompt for environmental context
+
+**Landscape to Portrait:**
+- Extend top and bottom
+- Consider sky above, ground below
+
+**Square to Cinematic (16:9):**
+- Add 280px each side for 1080p
+- Describe scene continuation
+
+## Best Practices
+
+- **Overlap slightly** — let AI see edge context
+- **Match lighting direction** — describe consistent light
+- **Extend in steps** — don't 4x the canvas at once
+- **Describe style** — "same artistic style", "photorealistic"
+
+## Common Issues
+
+- **Style mismatch** — add style keywords to prompt
+- **Repeated elements** — AI may duplicate objects
+- **Perspective errors** — complex scenes may warp
+- **Seam lines** — blend with photo editor after