.WEBP is the latest and greatest image format, using new wavelet compression algorithms, it saves better quality files than .jpg at significantly reduced file size. I have been testing it for a while and works well, if you can find an application to save to it + google and others are encouraging widespread adoption.
I added a few of the bigger background images to a site as webp. Tested carefully with a range of browsers and all seemed good. Only when watching a few session playbacks on Statcounter (brilliant tracking tool, playback is £5 month) and realised that certain older versions of Safari were not showing the images. Oops!
All site images are back as jpg and will remain that way for the foreseeable future…Sod the page load speeds!
PS I have a strong suspicion that webp is a rebranded JPG2000, but cannot confirm - if you change the file ending of a webp file, it opens in most applications
Absolutely right on the lack of support. I had tested on FF, Opera, Safari and a few more, forgetting that I always use the latest browsers. Rookie error!
Good thoughts on image dimension thanks. I have also added code to increase the length of server cache which gave me a good improvement in Google PageSpeed. Slowly, Slowly the improvements are making a difference, the only problem is the 5 other sites to follow!
Thanks Paul. @habitualshaker 's Container stacks also support webp as background images and they work well, with browsers that support the format. Therein lies the issue though: browser support. Fallback is OK if it is all image sizes, but most of my site images are now 3-4 different sizes for optimal load speed and tbh I’m not interested in generating extra versions. Lightroom and most Adobe products don’t yet export the format, so it is all too much fuss at this point.
Interesting you raise this - 20 years ago I was talking with a Danish company that had developed the tech to offer that service, but at that point it was for large files like tif / pdf for magazines to download from original master files. Cloudinary look interesting btw :)