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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?

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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" :

Image contained in incorrect format. Quality consequently reduced.

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Technically the extension is correct for the file format. The file format is not optimal... actually, that's pretty good: "not optimal file format" – Coomie Aug 31 '11 at 8:23
Putting that into a sentence, that could read "Not optimal file format. Quality reduced" That'd sound pretty good. Love that suggestion – Thursagen Aug 31 '11 at 8:27
I don't think that you'd use 'contained' in this way to describe this kind of problem - I'd say "The images were saved in the wrong format, which reduced their quality", or if you want to be a little more precise "the image files were saved in the wrong format...." – tinyd Aug 31 '11 at 10:01
I'd suggest: "This sub-optimal format will lower the image quality." – Kyle Pearson Aug 31 '11 at 10:05
@Kyle Pearson - the phrase 'sub-optimal' is not helpful here IMO - it depends on what you're trying to optimize. It's quite possible that the images were saved in a format that made the files very small, but which made the images themselves look poor. So if small size was important, then the files were optimal. – tinyd Aug 31 '11 at 10:18

For a nice, neutral lead-in to a recommendation that the image file format should be changed, I'd say something like

The image file format chosen does not give the best image quality.

(The format isn't "wrong", since the images still display correctly; it's just not the best choice for the job.)

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+1 for clarifying that the choice of format largely comes down to a trade-off between filesize and image quality. It could easily come across as impolite to tell someone that they made a "wrong" choice of format, just because you favour quality over size more than they do. – FumbleFingers Aug 31 '11 at 14:37

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