If you made an image [TIFF, PSD etc] with the correct dimensions (i.e. expressed in inches or mm) at 72 PPI and you need the same dimension but at 300ppi you really have to start over - or - accept that pixels are being created to achieve the desired ...
Sets the height of the image. No default value is provided. The default measurement unit is In. The valid values of measure that can be selected are in (inches), mm (millimeters), cm (centimeters), and in (points). Page Range:
If there are non-vector elements, tell us the resolution in pixels per inch (ppi). For example, a 300 x 300 pixel image that prints at 2 inches square is 150 ppi. A screen grab of your file may help understand what you need as well. Votes Upvote Translate Translate Report Report ...