A reader recently wrote: "How do I reduce a 2-megabyte JPG photo to a few hundred kilobytes? I don't want to resize the picture; just make the file size smaller so it can be emailed as an attachment more easily."

Well, it's helpful to understand why digital photos are usually saved in the JPG format to begin with. There are file size choices that range from very small to very large (lower quality resolution to higher quality resolution). Surprisingly, going from a high bit count (hi-res) to a lower bit count (low-res) often results in an image that shows little discernable difference in quality.

Various image-editing programs have different ways of letting you adjust the bit count, but my favorite is Irfanview, which is a free download from Irfanview.com

Open a picture in Irfanview, go to File>Save As, and choose JPG from the "Save As Type" list. A sliding "Save Quality: (Best to Lowest) bar will appear that displays a percentage number as it is moved.

Experiment with different percentages to see how small you can make the file, yet maintain an acceptable image.

IMPORTANT: be sure to change the file name with each attempt (such as Mary1.jpg, Mary2.jpg, Mary3.jpg, etc.). Always retain a copy of the original image with its name unchanged. If the original's file size is reduced and then saved with the same name it can NOT be returned to its previous status. This is why JPG is known as a "lossy" image format.

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