Jan 192013

lossyPicasa is different. With most programs, we teach .. Save, Save, and Save often. With Picasa, we teach – Don’t Save!

This is important for maintaining the quality of your photos. Usually your photos are .jpg type of files. These type of files are compressed. Every time you re-save them it goes through the compression process and you lose some quality. This is called ‘Lossy’ compression. If you want to understand it, I found this good article on the .jpg format. Basically, every time you make a change and re-save a .jpg picture, you are degrading the quality of that picture by one generation. If you crop it and save, you’re 2d generation. If you then add some fill light and save again, your picture is now 3d generation, and on and on.  Think of making copies of copies and you’ll get the idea.  Although the amount of degradation is invisible to the human eye on the computer screen – it will make a difference if you ever want to print your picture.  The example of the purple flowers is an extreme example and you’ll need to click on the picture to see the difference.

Picasa does not allow you to overwrite your original photo. When you make edits, Picasa stores them in its picasa.ini file. When you look at a photo using Picasa you are seeing thru the eyes of this .ini file – with all the edits you made – but your original remains untouched. When you print, or email, or upload, or export – Picasa applies the edits on the fly so you see what you expect. Using this technique, your end result will never be more than 2d generation. If you do use the save command Picasa will save your original in a hidden file, thereby duplicating the amount of space taken up on your computer.

Our recommendation is: Don’t Save! Let Picasa do it’s thing. Use Export to create pictures for other programs to use.

Geeks on Tour Members will want to watch the following videos on this topic:

  1. How Picasa Handles Edits: Non-Destructive Editing
  2. Ways to Save
  3. Exporting Pictures for Use in Another Program
  4. Resizing Pictures
  5. Resizing a Batch of Pictures
  6. Resizing Pictures to Width and Height

This tip brought to you by Geeks on Tour

Geeks on Tour is a membership website.  There are lots of tutorial videos on editing your pictures with Picasa’s tools.  The first 3 are free for all to view.  To see all of them, you need a Geeks On Tour membership.  It’s only $7/mo or $58/yearly.  Join Today!