I'm writing a report on a website. There are files that were saved in the wrong format which has reduced the quality of the images. How can I say this, but still sound professional?
There isn't really a single word to state all this. You'd have to try a sentence. The example below has been written so that it sounds "professional" :
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For a nice, neutral lead-in to a recommendation that the image file format should be changed, I'd say something like
(The format isn't "wrong", since the images still display correctly; it's just not the best choice for the job.)