At S.C. Agency, we’re often asked about image size, some speak in MB’s and others in centimetres. This blog is going to outline the difference between a picture’s file size and how the quality can change when used.

1024 bytes = 1KB

1024KB = 1MB

1024MB = 1GB

1024GB = 1TB

KB – Kilobyte      MB – Megabyte      GB – Gigabyte      TB – Terabyte

If an image is less than 250KB, it will only be suitable for use on screen and if the picture is between 250-500KB, it can be used as a small thumbnail (to depict a link or product on a webpage for example). If you were to choose an image that was between 500KB and 1MB, it could be placed comfortably on an A7 sheet (which is one eighth of an A4). As the image file size gets bigger, you should be able to stretch the image without losing quality. Once you go above 3.5MB, you’ll be able to cover an A4 sheet, but if you’re looking for an even bigger image, one that would fit on an A3 poster for example; You’d then use an image with a file size of at least 6MB.

Below you’ll see the difference between the images and their file sizes. On this page the images are scaled to the same size. The one on the left is 1mb and the one to the right is 183k. If they were viewed to scale the 1mb would be a bigger image and better quality.

DPI - 300

DPI - 72

Image quality

DPI (Dots per inch) or PPI (Pixels per inch) is something you may have heard designers talking about. Well, DPI and PPI are an indication as to the level of quality the image will be. The higher the DPI/PPI in an image, the better the quality will be.

An example of this is seen below, two images that are the same size in length and width but one has a DPI of 300, whilst the other has a DPI of 72. The lower DPI, will have lower pixel dimensions.

DPI - 300

DPI - 72

If you’re struggling with image size/quality and need help creating documents such as brochures or pages for your website, give us a call at our Corby office on 01536 648006 and we can help you and your business.