Getting a background white is often a necessity for when images are to be inserted onto a white printed or webpage. The best way to do this is to shoot your subject against a white background and light both the background and your subject separately. But we don’t live in the ideal world and often time space or equipment is not available to us. If you can shoot a clean image of your subject against an white background and as long as the subject is properly exposed it is possible to make the greyness around turn white using Apple’s Aperture program.
The first of the three images below is the raw image I shot of my Canon 24-70mm using an overhead Elinchrome Dlite 4 with a soft box about 60cm above facing directly down. The camera settings were ISO 200 f11 at 1/125 of a second.
The second image shows an adjusted colour balance using the eyedropper tool in the white balance panel of Apertures Adjustment settings. I use the eyedropper to sample an area of the that I know should be white. If you don’t like what you see first time just keep sampling until you get something you like the look of.
The third image is the result of using the Devignette adjustment in aperture. The Devignette adjustment can be found in the drop down list in the Adjustment tab in Aperture. There are two settings for this adjustment Intensity and Radius. By playing around with both the sliders depending on the image should turn any murky edges to your “white” background to pure white.
The beauty of using this method if you are using Aperture as your default library is that of speed. You can do all the adjustments within the program without the need to export it or open up Photoshop and as ever you can be assured that the original RAW file is untouched should you need to go back to it.