An ideal size for an image on a portal page is usually around 800×600 pixels. Reducing your 2048×2048 image to these dimensions should significantly decrease the file size while maintaining good quality for web display.
Using the convert Command
The most common way to resize images in the Linux terminal is with the convert command, which is part of the ImageMagick suite. If you don’t have it installed, you can get it using your distribution’s package manager (e.g., sudo apt-get install imagemagick on Debian/Ubuntu or sudo yum install imagemagick on Fedora/CentOS).
Here’s the command you’d use to resize your PNG file:
convert input.png -resize 800x800 output.pnginput.png: Replace this with the name of your original 2048×2048 file.-resize 800x800: This option tellsconvertto resize the image to a maximum width and height of 800 pixels. Since your original image is a square, it will be resized to exactly 800×800.output.png: This will be the name of your new, resized image file.
If you want to keep the aspect ratio while resizing to a specific width, you can use a command like this:
convert input.png -resize 800x output.pngThis command will resize the image to a width of 800 pixels and automatically adjust the height to maintain the correct proportions.
Choosing the Right Dimensions
The “ideal” size depends on how the image will be used. Here are some common sizes for different use cases:
- Standard Web Images 🖼️: 800×600 or 1024×768 are great for general use. They look sharp on most screens without being too large.
- Header Images 🖥️: A width of around 1200×400 to 1920×500 is common. This is a wide, landscape format often used at the top of a webpage.
- Thumbnail Images 🖼️: For small previews, sizes like 150×150 or 300×300 are perfect.
Your original 5MB file is large due to its high resolution (2048×2048), which is common for photos taken with modern cameras. Reducing the dimensions will dramatically reduce the file size, making your portal page load much faster.
