macOS Preview is a powerful and versatile tool that allows users to view and edit images on their Mac computers. In this knowledge base article, we’ll walk you through the process of optimising images for the web using macOS Preview. We’ll cover the essential topics, from setup and installation to troubleshooting and best practices. Our step-by-step instructions and clear language will ensure an easy understanding, even for users who are new to the product. Let’s get started!
System Requirements
Before we begin, ensure that your Mac computer runs on macOS 10.6 or later. macOS Preview is pre-installed on all macOS systems, so no additional setup or installation is required.
Opening Images in macOS Preview
To open an image in macOS Preview, follow these simple steps:
1. Locate the image file you would like to optimise on your Mac.
2. Right-click on the image file and select “Open With.”
3. From the list of applications, choose “Preview (default).”
Reducing File Size
To reduce the file size of your image, follow these steps:
1. Open your image in macOS Preview (as described above).
2. Click “Tools” in the menu bar, and then choose “Adjust Size.”
3. In the “Image Dimensions” section, ensure the “Scale proportionally” option is checked. This maintains the aspect ratio of your image while reducing its size.
4. Enter a new width or height for your image, and the other dimension will be automatically adjusted.
5. Click “OK” to apply the changes.
Adjusting Image Dimensions
To change the dimensions of your image without affecting its file size:
1. Open your image in macOS Preview (as described above).
2. Click “Tools” in the menu bar, and then choose “Crop.”
3. Use the selection handles to adjust the cropping area as desired.
4. Press “Enter” to apply the crop.
Exporting Optimised Images
To export your optimised image:
1. Click “File” in the menu bar, and then choose “Export.”
2. Choose a new name and location for your optimised image.
3. In the “Format” dropdown, select “JPEG,” “PNG,” or another web-friendly format.
4. Adjust the “Quality” slider to control the balance between image quality and file size.
Troubleshooting and Best Practices
To ensure your image is saved with the optimal file size, it’s best to follow a few simple best practices.
First, when saving an image, always opt for a web-friendly format such as JPEG or PNG. These formats are specifically designed to save images in smaller file sizes than other formats like GIF or TIFF.
