In yesterday's post about creating digital records of physical items I mentioned using Skitch to take pictures and annotate them. One of the things about Skitch that I failed to mention in that post is that along with drawing and typing on a picture you can crop and blur items in a picture.
You can use the Skitch mobile apps (Android and iOS) and the Skitch desktop apps (Mac and Windows) to crop any image that you have saved. Likewise all four versions of the app have an option to blur items in a picture. To blur something simply select the blurring tool and start scribbling on the item you want to blur out. Both the cropping and blurring tools are useful when you have a picture of a classroom activity that you want to share without sharing faces of your students. The blurring tool is also useful when you want to share exemplars of students' work without revealing the names of the students who created the work.