Qimage reads the embedded size (if there is one) from the file.  I can't see what type of image file that is.  Is it JPEG, TIFF, PSD?

If 300 PPI is embedded in the file, Qimage will use that if you select "Original Size" as the print size.  If not, either the file is incompatible with embedded size reading or there is no size embedded.

You can put a sample on Google Drive and provide a link if you want me to look at your specific file to see if I can tell why it is showing that 257 PPI.

Regards,
Mike

I received the four JPEG images you sent.  All four come up 300 DPI for me.



Are you sure you didn't override the embedded size?  Click "More" at the bottom of the print sizes and then check "Original Size" and see if the override box in the upper right is checked.  That's the only way I can see that you wouldn't get the embedded size when you choose the "Original Size" print size.

Regards,
Mike