Image optimization is about reducing the file size of your images as much as possible without sacrificing quality so that your page load times remain low. It’s also about image SEO. That is, getting your product images and decorative images to rank on Google and other image search engines.
The image format is an important factor when it comes to Search engine optimization of images. PNG and JPEG are the normal formats being used throughout the web. PNG comes with high clarity and quality but the file size would be large.
JPEG is comparatively low in quality but you can always a better balance by adjusting the quality and size.
Compressing the images leads to faster loading. Each compressed image can make your website light, thereby providing a good response time. Many competent tools are available out there, to mention some:
The filename of the image can give google clues about the content of the image. This helps in ranking the results better with relevancy. For example; Bridal dress in white.JPG is better than IMG0000456.JPG
Make sure you use royalty-free images on your website. Copyright infringement can go bad for your venture. Photographs, illustrations, and other images will generally be protected by copyright and means that a user will usually need the permission of the copyright owner(s) if they want to copy the image or share it on the internet.
Google uses alt text along with computer vision algorithms and the contents of the page to understand the subject depicted on the image.
Images are an important source of information about the content on your site. You can give Google, additional details about the images and provide the URLs of the images we may not otherwise discover by adding information to an image sitemap.
Using Google image extensions in Sitemaps provide the search engine with additional information regarding the images on the website. This can help Google discover images it may not find through crawling.
Serving desktop-sized images to mobile devices can draw 2 to 4 times more data than needed. Serve device-oriented image sizes for better optimization.
Image SEO can improve your site ranking drastically when done right. Tiny things can make bigger changes. Focus on each step you take in SEO to achieve success.