Picasa has many practical features but one feature is ahead of its time: face detection. Google has a very practical purpose for using face detection in Picasa, but people are very divided over using this feature. It seems cool and futuristic, and it can work well on a reasonable amount of pictures, but for some people it is cumbersome to use and can slow down your computer. Read on to see how and when to use the face detection feature from Picasa.
What is the purpose of using face detection
You have to ask yourself an obvious question first: what are you trying to achieve by using face detection in Picasa?
Face detection makes sense when you want to identify faces in a photo. You simply want to say who it is in the picture. In addition, you would want to preserve this identification in the image metadata. This way you can search for pictures containing your cousin Mike for example.
It is obvious that if you take landscape photos you would not need to use face detection on them.
You would use face detection in Picasa for two things: to identify people and save this information in the picture file as metadata.
The pros and cons of using face detection in Picasa
The main advantage of using face detection in Picasa is that, once trained, the face detection algorithm in Picasa works very well. It is actually awesome!
Notice the words…once trained. The biggest drawback is that Picasa face recognition needs to be trained. At first it will be overwhelming, so you might want to start with only a couple of folders and see how it goes.
The second drawback is that Picasa will find a face even if that face is way off in the background somewhere.
And as far as automatically creating keywords with your people tags, you can just as easily use keywords for the people in your pictures rather than relying on Picasa’s algorithm to find them.
This feature might seem very cool to use at first but may not work well for you. So, before you jump in make sure you think about your goals.
If you have decided to give face detection a try, then read on to see how to use face detection in Picasa.
Set up your options for face detection in Picasa
- Enable face detection = this will turn face detection ON or OFF. This setting applies only to the folders where you have enabled face detection.
- Enable suggestions = This is useful when training the face detection algorithm. The default value is usually fine.
- Store name tags in photos = if you use face detection you should check this checkbox. This will save all the name tags to your image metadata which is one of the main reasons to turn on face detection in the first place.
Unfortunately Picasa will NOT write your name tags to the IPTC keywords section of your images. According to what I found online face recognition tags are stored in the XMP metadata format and do not appear in Picasa’s own tags screen
Setting Picasa options for name tags.
How to turn face detection ON in Picasa
To turn face detection on or off in Picasa, you need to use the Folder Manager function. For this you need to go to
File --> Add Folder to Picasa. This will bring up the Folder Manager window.
To turn on face detection on a folder it’s a bit trickier than it seems.
If a folder has face detection turned OFF, then you will not be able to turn face detection ON for ANY of this folder’s sub-folder. This means that you first have to turn ON face detection in the parent folder of the folder you’re interested in.
Use Picasa Folder Manager to turn face detection on.
For example, if I only want to turn face detection only for
2012-01-01-HOME-MISC, then I need to enable face detection all the way up at the
My Pictures folder level and turn OFF face detection for all the other folders except the one I am interested in.
How to turn face detection OFF in Picasa
Turning Face Detection OFF in Picasa is easy. Using the Folder Manager, you just select the folder you’re interested in and press the Folder Detection button. When a folder has face detection OFF it will look like the picture below.
Use Picasa Folder Manager to turn face detection off.
Should you use face detection in Picasa?
Then answer really depends on you. If you want Picasa to run as fast as it can then you should NOT use face detection (Read 3 ways to speed up Picasa). Or you can be selective on which folders you turn face detection on.
However, face detection can be very useful once trained because it identifies faces in pictures and creates keywords that get saved to those pictures. This is very useful for creating a meaningful image context for your digital photos.