What’s the best way to submit my photos?
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The preferred submission format is as a JPG file. TIFF files aren’t really needed to make a print, not even for large sizes. Nor are PSD files ideal, as these are open files from which layers can disappear, which you don’t want. JPG files are the preferred option: if you submit these based on 300 ppi that should do nicely. The software will check the format again prior to your upload; this can be seen by the yellow or red triangle with an exclamation mark.
The bigger the file, the better the image maxim doesn’t apply here. We only use the pixels we need, and a JPG file remains just as good as a TIFF file, subject to it having enough pixels for the format in question.