The table below shows the ideal image sizes and resolutions for different online and screen-based applications, starting with the …

 

The table below shows the ideal image sizes and resolutions for different online and screen-based applications, starting with the smallest size and progressing upwards.

Application Ideal Image Size
(in pixels)
Resolution
(in pixels/inch) 
For mobile phones and portable devices with small screens: 320 x 240 pixels 72 ppi

 

For emails, online sharing sites and viewing on standard computer monitors: 1024 x 768 pixels 72 ppi

 

Viewing at full-screen size on LCD monitors with 5:4 aspect ratio 1280 x 1024 pixels 72 ppi

 

Viewing on standard definition TV sets with 4:3 aspect ratios: 720 x 576 pixels 72 ppi

 

Viewing on widescreen standard definition TV sets: 1280 x 720 pixels 72 ppi

 

Viewing on high definition TV sets: 1920 x 1080 pixels 72 ppi

 

You need a much higher resolution when you want to make prints of your digital photos. For photos that will be examined closely – i.e. print sizes up to A4 – the recommended output resolution is 300 pixels/inch. For larger prints, which will be viewed from greater distances, the print resolution can be somewhat lower. The table below relates the output size required for high-quality photo prints to sensor megapixel counts.

Sensor Resolution (megapixels) Typical Image Resolution (pixels) Maximum Print Size Print Resolution Maximum Output Size
2.16 1800 x 1200 6 x 4 inch 300 dpi Snapshot prints
3.9 2272 x 1704 7.6 x 5.7 inch 300 dpi ‘Jumbo’ snapshot prints
5.0 2592 x 1944 8.6 x 6.5 inch 300 dpi 8 x 6 inch enlargements
7.1 3072 x 2304 10.2 x 7.7 inch 300 dpi A4 sized prints
8.0 3264 x 2448 13.6 x 10.2 inch 240 dpi A4 sized prints
10.0 3648 x 2736 18.2 x 13.7 inch 200 dpi A3 sized prints
12.1 4000 x 3000 20 x 15 inch 200 dpi A3+ sized prints
14.7 4416 x 3312 22.1 x 16.6 inch 200 dpi A2 sized prints
21.0 5616 x 3744 31.2 x 20.8 inch 180 dpi A1 sized prints

This is an excerpt from Post Capture Pocket Guide.
Click here for more details on this and other titles in the Pocket Guide series.

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