Have you ever tried to use a photo on a book cover or tried to get a picture printed only to be told the image resolution is too low or get an error message?
Whether you're using images for book covers, social media, or your website—understanding resolution doesn't require a photography degree. In simple terms: resolution is how much detail an image contains.
The Basic Difference
Imagine two versions of the same photo.
One is made of tiny, tightly packed dots of color—so small you can't see them individually. The other uses bigger, chunkier dots with visible gaps between them. That's essentially the difference between high and low resolution.
High resolution images - great if you are not sure how you'll use it
- Contain more information
- File size: Large
- Wide color range, accurate colors
- Suitable for large format printing
- Needed when quality matters with the image
- You might need to crop or zone in on an image
- Sharper when printed large or viewed up close
Low resolution images
- File Size: Small
- contain less information
- Not suitable for printing
- Great for thumbnails or small graphics
- Adding images to your website (large files slow down loading)
- Look fine on your phone screen but turn blurry and pixelated when you try to make them bigger
Here's the catch: you can always make a high resolution image smaller, but you can never truly make a low resolution image bigger without losing quality.
Does size matter?
Yes, high resolution images are LARGE! This can slow down the loading speed of your website which leads to frustration for visitors. This is why you should never grab an image from a website and expect it to print without distortion. Those small, web friendly files will look horrible when printed.
Practical Advice for Authors
When you're commissioning a book cover, always get the highest resolution version from your designer. You might only need it for digital publishing now, but if you later decide to print bookmarks, posters, or other merchandise, you'll be grateful you have it.
For your website, do the opposite. Shrink those images down so your site loads quickly. Most people won't notice the difference on a screen, but they will notice if your page takes forever to load.
If you're buying stock photos, download the largest size available for anything you might print. For social media graphics, the smaller versions work perfectly fine and save you money.
So... is resolution good or bad?
Resolution isn't good or bad—it's about what's right for your specific project. A low resolution image isn't a failure; it's just designed for a different job than its high resolution counterpart. The real trick is knowing which one you need before you commit to an image. Because while you can always make big images smaller, turning a small image into a large one.
So before you download, purchase, or approve that next image, ask yourself: where will this actually appear, and how large will it need to be?