When you say "scan a picture to pdf" do you mean that you are using a flatbed scanner to scan a printed photo or image, and that you want to get the photo or image into the computer and create a PDF file from it?
Yes. I have a flatbed scanner, Hewlett Packard. And I want to do exactly that.
If that's the case, then it would help to know what software you are using in conjunction with the scanner. If you aren't sure, here's a way to find out: Look at the top left corner of your screen, and you'll see that the name of the current application is always shown next to the apple logo, e.g., "Finder" or "Acrobat" or "Safari" or something else. When you are in the middle of scanning a photo, what name does it show there?
When I am scanning, what I have on top is HPScan Pro. I just did a test run. I asked the software to Scan to PDF.
If the scanning software you are using prompts you for the filename and location each time it scans, that's the time to notice where it's going or tell the software where you want it stored (see
explanation).
I saw that an option was to scan to the desktop, to a certain folder where I have other pictures. I gave it a name and clicked Save. Yet, after the scan was complete, the file is not there and the spotlight says there is nothing found. This is very baffling.
If the software doesn't prompt you, and instead it creates files without asking for the filename or location, then there is probably a program "Preferences" setting that tells it what folder to use; the specifics depend on which software it is, hence the question above.
Even if you don't know where the file is, there's an easier way to find it than opening folders in the Finder. Just type the filename into the
Spotlight search box at the top right of your screen. If it finds the file, it will show you the filename. You can point at the filename to see the path to the file on your disk, or click the filename to open the file.
Note that you don't necessarily have to create a PDF out of your image. Depending on what you plan to do with the image, you might find it even easier to leave it in an image-specific format -- jpeg or tiff or gif or png -- rather than convert it to a document format like PDF.