When a printer or designer tells you a file is too low resolution, they’re not being difficult.
The image just doesn’t have enough pixels to reproduce clearly at the size you need, and no amount of resaving it will change that.
Understanding resolution isn’t technical knowledge reserved for designers.
Any business owner who supplies artwork for print or uploads images to a website will come across it, and the explanation is simpler than it sounds.
What Image Resolution Means – From Printing Glasgow Experts
Every digital image is made up of pixels, which are tiny coloured dots arranged in a grid. The number of pixels in an image determines how much detail it contains and how clearly it can be reproduced when displayed or printed.
Resolution is measured in pixels per inch (PPI) or dots per inch (DPI) and describes how tightly those pixels are packed together.
A high-resolution image has more dots per inch, so the picture appears sharp and detailed.
A low-resolution image has fewer dots per inch. The individual pixels become visible, and at print size the image looks blurry or blocky rather than smooth.
Image dimensions are often expressed as width x height in pixels: 1920 x 1080, for example. But dimension alone doesn’t tell you how the image will look in print.
What matters is how many pixels fall within each inch of the final output.
Defining Low Resolution
Low-resolution is used as an adjective to describe any image that doesn’t contain enough pixel data for its intended purpose.
“Low-res” is a term used across photography, graphic design, and print, and the definition of what counts as “low” changes depending on how the image will be used.
For screens and web usage, 72 DPI is standard. Websites display images at roughly 72-96 PPI, and that looks clear on a monitor because screens have their own pixel density.
A 72 DPI photo or graphic will display fine on a website but produce a noticeably soft result if you try to print it at any meaningful size.
For print, 300 DPI is the widely accepted standard.
Anything below that will appear blurry or pixelated depending on the print size and viewing distance.
Smaller items like business stationery and cards need at least 300 DPI to look sharp, because they’re viewed up close.
Low Resolution vs High Resolution
The most visible difference between a low-resolution image and a high-resolution one is the level of detail.
A high-res photograph looks crisp, with clear edges and smooth gradients.
A low-res version produces a pixelated image with softer edges, reduced contrast, and blocky transitions where colours meet.
On screen, low resolution is sometimes harder to spot, particularly when images are viewed at smaller sizes. The problem becomes apparent when you zoom in or scale a low-res image to a larger format.
Resizing a small image upward makes the pixels larger and quality deteriorates.
A high-resolution image can be scaled down without any loss, but scaling up a low-resolution image doesn’t produce a sharper result. The pixel count doesn’t increase when you stretch it.
Where Low-Resolution Images Come From
A screenshot captures your screen at roughly 72-96 DPI, which isn’t enough for print.
If you’ve ever screenshotted a logo from a website to send to a printer, that’s usually where the problem started.
Downloading from social media is another common cause. Facebook and Instagram compress images to reduce file size, and that strips out pixel data. Photos that look sharp on a phone screen often fall apart in print.
Camera settings matter too.
Most modern cameras produce large files by default, but heavy cropping reduces the effective pixel count. A heavily cropped section can end up very low resolution even if the source file was large.
File size doesn’t reliably indicate quality.
A large JPEG compressed repeatedly will produce poor output, while a smaller PNG or TIFF that retains all its pixel data may produce a far clearer image at the same print size.
What Resolution You Need to Print
For most printed materials, 300 DPI at the final print size is the standard.
At that resolution, you get a clear image with visible detail that looks professional in print. That covers leaflets, business cards, brochures, stationery, and posters.
If you need to print something and the source file sits below 300 DPI, you’ll see the quality suffer in the output, and no reprinting will fix a problem that starts with the source file.
For large format printing such as banners and exhibition displays, the required resolution is lower, typically 100-150 DPI, because viewing distance compensates for the lower pixel density.
Vector artwork is a different category altogether.
A vector file, produced in software like Adobe Illustrator, is built from mathematical paths rather than pixels, so it can be scaled to any size without losing quality.
Logos designed as vectors by our graphic design team will reproduce sharply whether they’re printed on a small effective flyer or a full-size banner, and they never go low resolution regardless of output size.
How to Check Your Image Resolution
On a Windows computer, right-clicking an image and selecting Properties then the Details tab shows the horizontal and vertical DPI alongside the image dimensions.
On a Mac, opening the file in Preview and going to Tools, then Show Inspector gives the same information.
Image editors like Adobe Photoshop and Adobe Lightroom display resolution and let you adjust the output settings directly. Photoshop’s Image Size panel shows the current DPI and how the dimensions change at different resolutions.
Free tools like GIMP offer similar functions if you don’t have Photoshop. Any of these work for checking resolution before you send a file to print.
Increasing the DPI number in an editor doesn’t add pixel data that isn’t already there. If you set a low-res image to 300 DPI without resampling, the software isn’t creating new detail.
A high-resolution image has to come from a higher-quality source. No editor can add pixels that were never captured in the first place.
Need Help with Print or Design? Contact Soapbox Today
Soapbox Digital Media has been helping businesses all over Scotland with their print, design, and marketing campaigns.
If you’re unsure whether your files are suitable for print or branding, we check artwork before it goes to press.
Simply send your files across or call us on 0141 429 1356, we’ll let you know what you need and what we can do!
