Overview

Image files, especially photographs, can become very large depending on how they were created. Reducing the file size usually means reducing image quality to some extent. These tips are intended for situations where the image needs to be viewed clearly, rather than where the highest possible image quality is required.


Tools

The university provides image editing software on most university machines. For these tips we would recommend using the following:

  • Adobe Photoshop


Exclamation mark icon Important:

  • Before making any changes, save a backup copy of your original image. This allows you to return to the original version if you are unhappy with the results.
  • Be cautious when using online image compression tools. Some websites may be unsafe or collect your files and data. Wherever possible, use trusted software provided by your institution or downloaded from reputable sources.
  • Reducing the displayed size of an image after uploading it does not reduce the file size. For the best results, resize and optimise the image before uploading it.

1. Choose the correct file type

The file format you choose can have a big impact on image quality and file size. JPEG files are usually the best option for keeping file sizes small and are suitable for most uploads. PNG files are larger but support transparent backgrounds and can preserve image quality better. TIFF files can be very large and are mainly used for professional printing and publishing, so they should be avoided unless specifically required.


The "Save As" dialogue box.


2. Adjust the resolution

When you create a file in Adobe Photoshop it is possible to adjust the resolution. This will affect image quality but reduce file size significantly. 


Setting the image size in Adobe Photoshop.


3. Change colour depth/mode

Another way to reduce the file size of images is to limit the number of colours that can be utilised. 32 Bits/Channel give us access to more colours and therefore richer, higher quality images, but 8 Bits/Channel will be suitable in most cases. Adobe Photoshop allows you to do this by choosing image > mode > 8 Bits/Channel.


Limiting the number of colours to 8 Bits/Channel.


Question mark iconFurther Support

For general queries about the Learning Space, students should first contact their module leader or personal tutor. For any other comments or issues within this guide, please contact the Digital Learning Team via dlsupport@falmouth.ac.uk. Alternatively, please refer to the numerous help guides found on our Knowledge Base. 


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