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Convert between image resolution units instantly with our free online converter.

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Image Resolution Converter

免费图像分辨率转换器, 即时换算 DPI、PPI、每厘米点数和每毫米像素

使用 OmniConverter 免费在线图像分辨率转换器在 DPI、PPI、每厘米点数和每毫米像素之间即时换算。1 DPI 等于 0.394 点/厘米，1 PPI 等于 1 点/英寸。无论你是准备打印文件、优化数字图像还是处理 DICOM 标准，都能获得精确的分辨率换算。

使用方法

通过三个简单步骤进行转换。

1

输入图像分辨率值

2

选择源分辨率单位与目标单位

3

查看转换后的分辨率

热门换算

DPI 至 PPIPPI 至 DPIDPI 至 Dots/cmDots/cm 至 DPIPPI 至 Pixels/cmPixels/cm 至 PPIDPI 至 Dots/mDots/m 至 DPIDPI 至 Dots/mmDots/mm 至 DPIPPI 至 Dots/cmDots/cm 至 PPIPixels/cm 至 Dots/mmDots/mm 至 Pixels/cmDots/cm 至 Dots/mmDots/mm 至 Dots/cm

常用基准

参考

1 DPI → DPI

1 DPI

参考

1 DPI → PPI

1 PPI

参考

1 DPI → dot/m

39.3700787402 dot/m

参考

1 DPI → dot/cm

0.3937007874 dot/cm

参考

1 DPI → dot/mm

0.0393700787 dot/mm

参考

1 DPI → px/cm

0.3937007874 px/cm

参考

1 DPI → px/mm

0.0393700787 px/mm

实际应用场景

在中国印刷行业，标准印刷分辨率为300 DPI。一张A4（210×297mm）宣传册需要2,480×3,508像素。专业摄影作品交付给出版社时要求300 PPI、CMYK色彩模式。网页使用72 PPI即可，但苹果Retina屏需要@2x（144 PPI）甚至@3x（216 PPI）的资源。扫描仪：文档归档使用300 DPI、照片600 DPI、胶片/幻灯片2,400-4,800 DPI。在医学影像领域，DICOM标准常见分辨率：CT为512×512像素，MRI为1,024×1,024像素。在UI设计中，设计师为不同屏幕密度导出切图, Android的mdpi（1×）、hdpi（1.5×）、xhdpi（2×）、xxhdpi（3×）、xxxhdpi（4×）。在大幅面喷绘（海报、灯箱）中，近距离观看需要150-200 DPI，远距离观看（如高速路广告牌）15-30 DPI即可。国家地理信息公共服务平台的卫星影像分辨率达到亚米级。打印机的DPI（如爱普生墨点式达5,760×1,440 DPI）与图像的PPI不同，需要匹配。高德和百度地图的瓦片图像分辨率为72 PPI。婚纱摄影精修图的输出尺寸约6,000×4,000像素（2,400万像素），可用于巨幅照片。

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常见问题

常见换算问题的快速解答

300DPI是什么意思？+

300 DPI（每英寸点数）是高品质印刷标准。中国印刷业采用此标准。A4印刷需2,480×3,508像素。

医学影像DICOM是什么？+

DICOM是医学数字成像和通信标准。中国医院放射科使用DICOM格式，分辨率72-300 DPI。

DPI和PPI的区别？+

DPI是印刷点数，PPI是屏幕像素数。数值上等效，但分别用于印刷和显示。

如何将DPI换算成点/cm？+

DPI除以2.54得到点/cm。

网页图片需要多少分辨率？+

网页标准72 PPI。高清屏（Retina）需144 PPI。

如何将px/cm换算成DPI？+

px/cm乘以2.54得到DPI。

打印照片需要多少像素？+

6寸照片（4×6英寸）在300DPI下需1,200×1,800像素。

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Tips, guides, and insights about unit conversions

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Quick Answer: Image Resolution Converter

Convert image resolution instantly — enter any value and get all units at once. Common resolution conversions include DPI to PPI (1 DPI = 1 PPI), DPI to dots per cm (100 DPI = 39. Image resolution conversion is critical for print preparation (300 DPI), web optimization (72-96 PPI), large-format banner printing, photo lab submissions, and scanning archival documents.

How the Image Resolution Converter Works

Our image resolution converter converts between DPI (dots per inch), PPI (pixels per inch), and metric resolution units like dots per centimeter and dots per millimeter, so your images print or render at exactly the right density.

Formula & Sources

DPI/PPI are reciprocals of dot pitch. 1 in = 25.4 mm exact (BIPM). 300 DPI → 118.11 dots/cm.

Worked Example

Example: 300 DPI = 118.11 dots/cm. 8×10 inch print at 300 DPI = 2400×3000 px.

Common Image Resolution Conversions

Common resolution conversions include DPI to PPI (1 DPI = 1 PPI), DPI to dots per cm (100 DPI = 39.37 dots/cm), and PPI to pixels per mm (300 PPI ≈ 11.81 px/mm). Print standard is 300 DPI; screen standard is 72-96 PPI.

When to Use Image Resolution Conversion

Image resolution conversion is critical for print preparation (300 DPI), web optimization (72-96 PPI), large-format banner printing, photo lab submissions, and scanning archival documents.

Accuracy & Common Mistakes

All factors are stored unrounded and computed in double precision. We avoid cumulative rounding by converting via a base unit. Always verify critical results with a second source for safety-critical tasks.

Frequently Asked Questions

What DPI for print?

300 DPI is the standard for high-quality print (118 dots/cm).

What PPI for web?

72–96 PPI is typical for screens. Use 300 PPI only for print.

How to calculate print size?

Print width = pixels ÷ DPI. Example: 2400 px ÷ 300 DPI = 8 inches.

Popular Image Resolution comparisons

Jump directly to a side-by-side comparison — no typing needed. Also discoverable via search.

Dot per inch → Pixel per inch→Dot per inch → Dot per meter→Dot per inch → Dot per centimeter→Dot per inch → Dot per millimeter→Pixel per inch → Dot per meter→Pixel per inch → Dot per centimeter→
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