That's a WEBP file, not a JPG. There are no native utilities in MATLAB that I know of that will read a WEBP. You will need to use external tools to convert the file if you want to view it in MATLAB.
On Linux, I can install the webp package and then use cwebp and dwebp to encode and decode WEBP files.
webpname = 'image.webp';
tempfilename = 'temp.png';
system(sprintf('dwebp %s -o %s',webpname,tempfilename));
inpict = imread(tempfilename);
imshow(inpict)
Maybe there are other options, but they'll all be external and may depend on your OS.
EDIT:
That workaround is still about the only thing there is. I just added a simple pair of tools to MIMT to do the job using cwebp and dwebp.
% at least it's more convenient than using system()
inpict = wpread('image.webp');
Images with transparency (IA/RGBA) will be returned with attached alpha.
MIMT wpwrite() accepts I/IA/RGB/RGBA images, and defaults to lossless encoding options (-lossless and -exact in cwebp versions which support it). Something tells me though that 99% of users' interest in WEBP is trying to figure out how to make it go away, not how to create more.
