Anzeige von PPI zu DPI ändern

Per Bentsen answered correctly above, but if you want more details: It depends on the format and method you are using to save the file for printing, because some Photoshop commands save ppi resolution, but some commands do not. You may have used one that does not.

If an application tells you the image is 96 ppi when in Photoshop it was 300 ppi, this is what is probably happening: You used an export command that does not embed ppi metadata, so the receiving application assumed its default value. It sounds like the application you used defaults to 96 ppi when ppi metadata is missing. Other applications default to assume 72 ppi. But it is important to understand that this is not reporting the actual image ppi, because there is none in the file. 96 ppi is an assumption made in the absence of an actual ppi value.

Note that ppi metadata is not always required to print an image at the correct size. If it will be printed by software that sets the image size on the page, there is no need for ppi metadata because the print dimensions in inches/cm will determine that.

For example, if you have a 3000 x 2000 px image at 96 ppi, that means if printed at 96 ppi, it would be 31.25 inches long, not a typical print size. But, without changing anything in the image itself, if the print software sets a print length of 10 inches, the effective (after scaling) ppi will now be 300 ppi. Because the 3000 px length will now be divided by 10 inches, and 3000/10 = 300 ppi effectively.

Now, there are some workflows where it is useful to embed a specific ppi metadata in the image. This is usually done to communicate the intended print dimensions to the receiving software that will print it. If this is what you want, always use the File > Save As or File > Save a Copy commands to create the version for print. Those commands always embed the ppi value into a JPEG, TIFF, or PSD format file.

If you instead use a command on the File > Export submenu to create a file for print, the ppi metadata will be missing. This is because commands on the File > Export submenu are not intended for print. They are intended for screen delivery (web graphics, stills for video, mobile app design). For screen delivery, ppi is not needed, so it is not included. Excluding metadata makes the file size smaller, which is important for web/mobile graphics.