Once you have made all the changes required, go to the main DPP menu (not the buttons in the window), select 'File', then 'Convert and save…'. This will give the window below, where you can select the type of file you want to save. Options include JPEG and TIFF, or both together. The 'Image quality' slider sets the level of file compression - lower values are good for computer display, higher values are better if you plan to print the image (though the file size will be larger).
The 'Output resolution' is shown in dpi which stands for Dots Per Inch. The dpi is a measure of the resolution of an image when it is printed or displayed on a monitor. A dpi of 350 is good for printing - 72dpi is adequate for a computer display. Remember that you are not committing to anything with this save - you can always go back to the raw file and start again to produce the same or a different image.
When you quit DPP it will ask if you want to save edited images (above). This is very different to the 'Convert and save…' option. Here, DPP is simply attaching the changes you have made to the raw image. These changes will be applied to the raw image the next time it opens. There is no change to the raw image itself, only to information linked to the image. This feature is very useful if you need to spread your modification work over two or more sessions - you do not have to start from the beginning each time.
Experiment with DPP
The best way to learn how to use DPP is to use it. Every change you make is shown on screen in real time. None of the changes affect the raw image, so you can always go back and start over. However, we will be looking at more of the many DPP features in the future.