Today I noticed that jpg images on a site that I manage for a friend are blurry, like they are over compressed. I tried uploading a new image from my computer and it turned out the same. I uploaded a png version of the same file and it works - crisp and clear.
Most of the original files are png, some are jpg, but I convert them to jpg for smaller file size and quicker page load. I save the files at the size that they will appear on the website - 150x150 for thumbnail images, 1000 wide for the header - then compress to 80%. They are perfect on my computer, but blurry once uploaded.
This is a new phenomenon. I am quite picky about such things and remember uploading and using some of the same jpg files in the past and they were perfect. I even notice that the banner is degraded as compared to the original and the thumbnails for older posts, which were fine when originally uploaded, are now blurry.
I would consider the possibility of a plugin conflict, or upgrade issue, but I manage another site using the same theme and plugins and the same jpg file uploads and displays just fine on that site. Also the banner on that site (also a jpg) is crisp and clear. Apparently a setting has changed on the one site, but where?
Here is the 150x150 image on the site where it is blurry - http://www.castlereport.us/wp-content/uploads/2013/12/CReport_150_ConvertedToJPG.jpg
Here is the same file on the other site where it is good - http://www.cynthiadavis.net/wp-content/uploads/2013/12/CReport_150_ConvertedToJPG.jpg
Any help greatly appreciated.