Mac Software To Convert Negative To Positive Images
You scanned it as a black and white with the grayscale color mode. iPhoto doesn't play well with that format. Open the photo with Preview and save it as a color jpg file. That will do the trick. Or, you can download the Convert to JPG and Embed sRGB profile.zip Automator workflow application what will convert the file to a sRGB color mode JPG file.
TIP:For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto (iPhoto.Library for iPhoto 5 and earlier) database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've created an Automator workflow application (requires Tiger or later), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 6 and 7 libraries and Tiger and Leopard. Just put the application in the Dock and click on it whenever you want to backup the dB file. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.
Note: There's now an Automator backup application for iPhoto 5 that will work with Tiger or Leopard.
Convert Negative To Positive Number
Using this online tool, you can also make a positive from the negative of photo with all default settings. To make a 'black and white negative', first convert a color photo to a black and white here, download result and then select and process it here, on this page, with default settings. The original image.