Choose File > Save As and name this new version "resize-practice-small.jpg." We will be using it in the next part of the lesson. You may use the save options shown above for this file, but see my article on which graphics file format to use if you'd like more explanation of these options.
This covers the typical uses of the Image Size dialog box, but I am going to encourage you to go back and spend some time experimenting with all the options in Image Size, just to get a feel for what they do. For instance, try all three of the interpolation methods for resampling, change the pixel dimensions without the constrain proportions box checked, resample an image repeatedly and then compare it to an original to observe the effects of repeated resampling.
