Decoding Image Quality: High-Resolution vs Web-Optimised Images

In the visual-centric digital era, the quality of images plays a pivotal role in capturing attention and conveying information effectively.

When it comes to images, two terms often come into play: high resolution and web-optimised. There are clues in your image properties - right click your image, navigate to properties, and use these tips to identify whether it’s high-resolution for print or optimised for use on the web.

Understanding High-Resolution Images:

High-resolution images are those that contain a significant amount of detail and are suitable for high-quality printing and large displays. These images have a higher number of pixels per inch (PPI) or dots per inch (DPI), resulting in sharper, more detailed visuals. Here's how to identify a high-resolution image:

• They have larger dimensions in pixels. For example, an image that is 3000 x 2000 pixels is likely to be higher resolution than one that is 800 x 600 pixels.

• Common file types are TIFF, RAW, and PSD as they preserve image data without compression.

• They are 300dpi or higher - this refers to how many dots of colour per inch the image contains. 300dpi is optimal for printing crisp, clear images.

• They have larger file sizes - generally anything over 3.5MB is considered a high resolution image.

Understanding Web-Optimised Images

Web-optimised images are specifically prepared to be displayed on digital platforms such as websites, social media and emails. They are optimised for faster loading times and better performance on screens. Here's how to identify a web-optimised image:

• They often have smaller dimensions, making them quicker to load. For instance, an image that is 800 x 600 pixels is likely optimised for the web.

• Common formats include JPEG, PNG, and GIF. These formats use compression to reduce file size without compromising the overall appearance.

• They are 72dpi - screens display images at 72dpi.

• They’re in RGB colour space, perfect for websites, social media, and digital presentations.

• They have smaller file sizes compared to high-resolution images. This is achieved by compression techniques that maintain a balance between quality and loading speed. As a rule of thumb, anything under 1MB is suitable for web.

Understanding the differences between high-resolution and web-optimised images is crucial for maintaining quality in different contexts. By recognising their unique attributes, you can ensure your visuals deliver the intended impact across various mediums.