What size image do I need for my brochure?

Deciding what size image to buy or if the image you have will print properly and fill the space required can be a crucial problem! Trying to use an image as a full page spread will only work successfully if big enough and knowing how big it is is often left to trial and error! In the previous article resolution was discussed and how big images can appear in different resolutions required for print versus those needed for the web.

The guide below shows you the size in mm of the image, the size of the image in ‘kb’ or ‘mb’ at both 72 dpi and 300 dpi.

This should help you when considering how big an image needs to be for the purpose you require.

300 dpi – 10 x 10 mm/118 x 118 px = 109 kb
72 dpi    – 10 x 10 mm/28 x 28 px = 36 kb

300 dpi – 20 x 20 mm/236 x 236 px = 237 kb
72 dpi    – 20 x 20 mm/57 x 57 px = 46 kb


300 dpi – 30 x 30 mm/354 x 354 px = 349 kb
72 dpi    – 30 x 30 mm/85 x 85 px = 57 kb

 

300 dpi – 40 x 40 mm/472 x 472 px = 460 kb
72 dpi    – 40 x 40 mm/113 x 113 px = 73 kb

 

 

300 dpi – 50 x 50 mm/591 x 591 px = 617 kb
72 dpi    – 50 x 50 mm/142 x 142 px = 105 kb

 


300 dpi – 60 x 60 mm/709 x 709 px = 848 kb
72 dpi    – 60 x 60 mm/170 x 170 px = 128 kb

 

 

 

300 dpi – 70 x 70 mm/827 x 827 px = 976 kb
72 dpi    – 70 x 70 mm/198 x 198 px = 134 kb

 

 


 

300 dpi – 80 x 80 mm/945 x 945 px = 1.2 mb
72 dpi    – 80 x 80 mm/227 x 227 px = 138 kb

 

 

 

 

300 dpi – 90 x 90 mm/1063 x 1063 px = 1.5 mb
72 dpi    – 90 x 90 mm/255 x 255 px = 148 kb

 

 

 

 

 

300 dpi –
100 x 100 mm/1181 x 1181 px = 1.7 mb

72 dpi    –
100 x 100 mm/283 x 283 px = 165 kb

 

Getting a 72 dpi image when you need 300 dpi has quite severe consequences, stretching and enlarging it will fill the gap but the quality of the image will be severely effected.

So a 10mm image is 118 px square at 300 dpi making 109 kb  multiplying that by 10, the 100mm image is 1181 px square.

image dimensions mm/pixels

Image dimensions mm/pixels ©Angieandco

Using these dimensions you should be able to multiply up to the rough size you will need for either 300 or 72 dpi.

You will also be able to refer back to compare the size of image you have and how big it is likely to be.

When searching in stock photo sites the image sizes are given in both pixels and mm and will state the resolution. When searching Google for images the sizes are always given in pixels, its very rare to be at 300dpi but you will have to check.

 

The first screen shot is from a Google image search, its a large image measuring 36.12 x 27.09 cms at 663 kb. You can set the search criteria to show the sizes of the images or just which sort of size you are looking for. This also reduces time and disappointment when searching for pictures that you like but find they are too small to use.

Have you seen any terrible examples of images that have been used at too small a resolution and have been stretched to extremes?

 – A.N.G. Design Consultancy based in Essex, UK, helping you communicate your message to your clients and generating more leads and sales.