File size explained

When you use graphics for printing, the graphic file sizes can be large; which isn’t a major issue as long as you have a fair amount of RAM and disk space. If you use graphics in a presentation such as PowerPoint, large file sizes won’t be a problem on a computer (for the same reasons) but will be a problem if you wish to store it on a disk and share the presentation. You may need to burn the presentation to a CD or DVD.

(Note: file size is not the actual dimensions of the image).

If you use graphics on a web page, the file size is crucial for download times. As a rough guide, pages that total 45kb should load via a 14.4kb modem within 15 seconds. Always check the total size of your work, which includes the graphics and any other work you’ve created.

To check the file size:

  • open the folder that holds the file
  • from the View menu, choose Details
  • the file Size should appear next to the Name column.

File Size screen

Resolution and Image size

Image Size
The image size is simply the physical dimensions of the graphic.

For example on a computer screen, if your screen setting is 640 x 480, an image of 640 X 480 pixels would fill the whole screen. If your screen setting is 1024 x 768, it would appear as about 2/3rds of the screen.

When working with images for the screen it’s always best to think in pixels instead of centimetres.

Image Resolution
The Image Resolution is the number of pixels per inch in the image (dots/inch, pixels/centimeter).

Large file sizes and high resolution are not important when creating images for print, in fact the larger the file size and resolution the better the quality.