background-removal

背景移除

使用 each::sense 通过像素级精准的边缘检测移除图像背景——这款智能 AI Agent 会自动为你的请求选择最佳模型。

快速开始

需要 each::labs API 密钥。请在 eachlabs.ai 获取。

使用 curl

curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $EACHLABS_API_KEY" \
  -d '{
    "messages": [{"role": "user", "content": [
              {"type": "text", "text": "Remove the background from this image completely. Return the subject on a transparent background with clean edges."},
              {"type": "image_url", "image_url": {"url": "https://example.com/product-photo.jpg"}}
            ]
          }
    ],
    "stream": false
  }'

使用 Python（OpenAI SDK）

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_EACHLABS_API_KEY",
    base_url="https://eachsense-agent.core.eachlabs.run/v1"
)

response = client.chat.completions.create(
    model="eachsense/beta",
    messages=[{"role": "user", "content": "Remove the background from this image completely. Return the subject on a transparent background with clean edges."}],
    # Images are included in the message content array above
)

print(response.choices[0].message.content)

使用参考图像

curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $EACHLABS_API_KEY" \
  -d '{
    "messages": [{"role": "user", "content": [
              {"type": "text", "text": "Remove the background from the first image and place the subject onto the scene shown in the second image. Match lighting and scale naturally."},
              {"type": "image_url", "image_url": {"url": "https://example.com/person.jpg"}},
              {"type": "image_url", "image_url": {"url": "https://example.com/new-background.jpg"}}
            ]
          }
    ],
    "stream": false
  }'

图像会使用 OpenAI 多模态内容格式放在消息中发送。每个请求最多可包含 4 张图像。

流式传输

将 "stream": true 设为实时接收 SSE 响应，或将 "stream": false 设为在单个响应中获取完整结果。流式传输适合在 UI 中显示进度；非流式传输则更适合脚本和自动化。

可用模型

模型	优势	最适用于
eachlabs-bg-remover-v1	精准的边缘检测、头发/毛发处理、透明输出	干净的抠图、产品照片、人像
flux-2-edit	使用自然语言替换背景	更换为特定的新背景
flux-fill-pro	移除背景后的图像修补	用新内容填充背景区域

对于纯移除任务，each::sense 会选择 eachlabs-bg-remover-v1；如果请求替换背景，则会选择 flux-2-edit。

使用场景

使用场景	指令	输出
透明 PNG	“完全移除背景”	主体置于透明背景上
白色背景	“移除背景，替换为纯白色”	干净的电商商品列表图
纯色背景	“将背景替换为品牌蓝色（#2563EB）”	品牌营销素材
渐变背景	“替换为柔和的灰白渐变”	专业人像照
更换环境	“将主体放在日落时分的热带海滩上”	生活方式合成图
影棚背景	“替换为无缝灰色影棚背景”	专业产品照

提示词技巧

干净地移除背景

"Remove the background completely. Keep edges sharp and clean,
especially around hair and fine details. Transparent background."

替换背景

"Remove the current background and replace it with [description].
Match the lighting direction from the original photo.
Keep a natural contact shadow beneath the subject."

阴影处理

控制阴影的处理方式：

"Remove background but keep the natural shadow beneath the product"
"Remove background and all shadows for a clean cutout"
"Remove background, add a soft artificial drop shadow on white"

边缘质量

指定所需的边缘处理方式：

"Ensure hair edges are soft and natural, not hard-cut"
"Keep crisp edges around the product with no background bleed"
"Apply a very slight feather on the edges for smooth compositing"

示例

电商产品抠图

curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $EACHLABS_API_KEY" \
  -d '{
    "messages": [{"role": "user", "content": [
              {"type": "text", "text": "Remove the background from this product photo and replace it with a pure white (#FFFFFF) background. Keep a soft, natural drop shadow beneath the product for a floating effect. Crisp edges with no background artifacts."},
              {"type": "image_url", "image_url": {"url": "https://example.com/sneaker-on-table.jpg"}}
            ]
          }
    ],
    "stream": false
  }'

专业人像照

curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $EACHLABS_API_KEY" \
  -d '{
    "messages": [{"role": "user", "content": [
              {"type": "text", "text": "Remove the background from this portrait photo. Replace with a smooth, soft-focus dark gray gradient that is lighter in the center. Keep hair edges natural and wispy, not hard-cut. Professional headshot quality."},
              {"type": "image_url", "image_url": {"url": "https://example.com/office-portrait.jpg"}}
            ]
          }
    ],
    "stream": false
  }'

用于设计的透明素材

curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $EACHLABS_API_KEY" \
  -d '{
    "messages": [{"role": "user", "content": [
              {"type": "text", "text": "Remove the background from this image entirely. Output a transparent PNG with no background at all. Clean edges suitable for layering in a design tool like Figma or Photoshop. Remove all shadows."},
              {"type": "image_url", "image_url": {"url": "https://example.com/plant-photo.jpg"}}
            ]
          }
    ],
    "stream": false
  }'

生活方式合成图

curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $EACHLABS_API_KEY" \
  -d '{
    "messages": [{"role": "user", "content": [
              {"type": "text", "text": "Remove the background and place this person on a sunlit rooftop terrace overlooking a Mediterranean coastal city. Match the warm afternoon lighting from the original photo. The person should look naturally placed in the scene with correct scale and perspective."},
              {"type": "image_url", "image_url": {"url": "https://example.com/standing-person.jpg"}}
            ]
          }
    ],
    "stream": false
  }'

社交媒体品牌帖子

curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $EACHLABS_API_KEY" \
  -d '{
    "messages": [{"role": "user", "content": [
              {"type": "text", "text": "Remove the background from this photo and replace it with a bold coral-to-magenta gradient going from bottom-left to top-right. Keep the subject sharp with clean edges. This is for an Instagram post, so make it vibrant and eye-catching."},
              {"type": "image_url", "image_url": {"url": "https://example.com/influencer-photo.jpg"}}
            ]
          }
    ],
    "stream": false
  }'

批量处理

# Remove backgrounds from multiple product photos
PRODUCTS=(
  "https://example.com/product-1.jpg"
  "https://example.com/product-2.jpg"
  "https://example.com/product-3.jpg"
  "https://example.com/product-4.jpg"
)

for URL in "${PRODUCTS[@]}"; do
  curl -X POST https://eachsense-agent.core.eachlabs.run/v1/chat/completions \
    -H "Content-Type: application/json" \
    -H "X-API-Key: $EACHLABS_API_KEY" \
    -d "{
      \"messages\": [{\"role\": \"user\", \"content\": \"Remove the background. Replace with pure white. Keep a soft natural shadow. Clean product cutout.\"}],
      \"image_urls\": [\"$URL\"],
      \"stream\": false
    }"
  echo "---"
done

主体类型与技巧

主体	难点	技巧
人物（头发）	细小的发丝	“让头发边缘保持柔和自然”
宠物（毛发）	蓬松的边缘	“保留边缘处的毛发细节”
产品（硬边缘）	反光、阴影	“保持边缘清晰，并处理反光”
植物（叶片）	复杂的轮廓	“保留叶片细节和间隙”
透明物体	玻璃、瓶子	“处理透明/半透明区域”
复杂场景	多个主体	“只分离中心的主要主体”

常见问题

• 未指定要保留的内容：“移除背景”是不错的指令；有需要时，“移除背景，但保留产品放置的桌子”会更好。
• 期望自动匹配颜色：替换背景时，务必提及“匹配光线”，以获得自然效果。
• 忽略头发/毛发边缘：默认移除可能会生硬地裁掉精细细节。请明确要求“柔和自然的头发边缘”。
• 未说明阴影处理方式：模型可能会不可预测地保留或移除阴影。请说明你的偏好。
• 颜色与主体相近的繁杂背景更难处理。主体和背景之间的对比度越高，结果越干净。

相关技能

• 图像编辑 — 移除背景后的常规编辑
• 图像放大 — 提升抠图的分辨率
• 人脸替换 — 替换合成图像中的人脸
• 图像生成 — 生成用于合成的新背景

文档

• each::sense 概览
• each::labs API