Digital Photography Hacks

Judge Image Sharpness by File Size

With a series of photographs of the same subject in hand, you can judge which shot is sharper without ever opening a file.

Figuring out which photo in a series is the sharpest can be a laborious task. If you have five shots of the same subject, you typically open each in turn in the image editor, examine them all closely, and then make a judgment call as to which one is the keeper.

If you have to work quickly, this approach can be quite frustrating, not to mention time-consuming. There’s got to be an easier way! And indeed there is.

You can make solid judgments about image sharpness without ever opening the file. Both Windows and Macintosh computers provide you with all the information you need by simply opening the folder that contains your pictures and viewing some of their basic data. Eyeballing sharpness is all a matter of size—file size, that is. The larger the file, the sharper the picture.

When you’re shooting in JPEG mode with your digital camera (which you usually are, unless you explicitly switch to TIFF or RAW), the files are compressed in the camera so that they don’t take up too much room on your memory card. Fine, sharp detail is harder to compress than softer, duller images. So, the resulting file for a slightly sharper image will be a little bigger.

Under Windows, open the folder of images and choose the Details view, as shown in Figure 5-1. In the Size column, you’ll see how big each image is. In this example, IMG_1005 and IMG_1006 ...