Photography in less-than-optimal lighting conditions leaves you with a choice between using only the existing light, which can result in dark and muddy photos, or using a flash, which can result in a noticeable flash shadow. Before digital photography and photo-editing software, photo touch-ups involved a difficult process, but editing programs like Google's free Picasa 3 let you adjust color and contrast, crop and retouch, and fine-tune your pictures to remove flash shadows.
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Open Picasa 3. Scroll to the folder containing your photo in the Library window. Double-click the photo to open it.
Click the "Tuning" tab. Click the "Highlights" slider and drag to the right to brighten the lighter areas of your photo. As the lighter areas expand, the flash shadow is removed.
Click the "Basic Fixes" tab. Click "Auto Contrast" and "Auto Color" to normalize the brightness from the "Highlights" tool. You can also use the "Fill Light" slider to brighten the picture.
Click "File," and then "Save As" to save the edited picture. Type a name for the picture in the "File Name" text box and click "Save."