Image Optimisation

Image optimisation is the process of reducing file size and dimensions of digital images without compromising their quality. The main aim is to create the lightest image possible, in terms of file size, to make the page load quickly and smoothly, providing an optimal user experience.

In the context of blockchain, image optimisation takes on new layers of significance. Blockchain technology, with its growing use in various fields including digital art and Non-Fungible Tokens (NFTs), relies heavily on image optimisation. Because every transaction (including image inscription) on the blockchain involves a cost, the size of the image can significantly impact the transaction fees. The larger the image, the higher the cost of storing it on-chain.

How to Optimise Images

Image optimisation involves several techniques and steps. Here are the most common methods:

  • Resize the Images: Reducing the dimensions of an image will reduce its file size. This can be done using image editing tools like Adobe Photoshop, GIMP, etc.

  • Compress the Images: Compression reduces the file size by removing the extra data. There are two types of image compression: lossless and lossy. Lossless compression reduces file size without affecting the image quality, while lossy compression reduces file size significantly, but compromises image quality to some extent.

  • Choose the Right File Format: JPEG, PNG, GIF, and WebP are common image formats. JPEG is good for photographs and detailed images, PNG is suitable for images with transparent backgrounds, and GIF is suitable for simple animations. WebP is a newer format that provides superior compression and quality characteristics.

  • Use Image Optimisation Tools: Many online tools and software are available for image optimisation. Some popular tools are TinyPNG, ImageOptim, and Photoshop's 'Save for Web' option.

For on-chain images, due to the cost associated with transactions, it becomes even more crucial to optimise images before uploading them onto the blockchain. However, one must ensure to keep a balance between the image quality and its size to maintain the integrity of the image while minimising the transaction fees.

Impact of Image Optimisation and Importance of Retaining Image Integrity

Image optimisation can greatly enhance the user experience on any website or app. Optimised images lead to faster page loading times, reduced bounce rates, improved SEO ranking, and lower usage of disk space and bandwidth.

In the context of blockchain, image optimisation helps reduce the transaction fees and the storage requirements on the chain. It makes it feasible to include high-quality images in blockchain transactions, which can be especially important in areas like digital art, NFTs, or any other application where images are stored on-chain.

However, it's important not to lose the integrity of the image during optimisation. Over-optimisation can lead to degradation of image quality, causing pixelation, blur, or loss of detail, which could undermine the purpose of using the image in the first place.

For blockchain-based images, this is especially important, as once an image is stored on the blockchain, it cannot be altered or removed due to the immutable nature of the technology. Therefore, image optimisation must be done carefully to ensure the image remains visually appealing and true to its original intent after it is stored on-chain.


Image optimisation is a critical aspect of modern digital technology and is especially relevant in the evolving field of blockchain. By effectively optimising images without losing their integrity, developers and users can save costs, improve user experience, and make full use of the exciting possibilities offered by blockchain technology. However, care must be taken to ensure that optimisation does not compromise the quality and value of the images being used.

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