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If you are using Adobe Photoshop Here is the One solution…
Load the image you plan to reduce glare from into Photoshop. Duplicate the layer containing the image by pressing “Ctrl-J,” to perform edits without disturbing the original image. Click "Image | Adjustments | Shadows and Highlights" to display the dialog box with controls for lightening your image’s shadows and darkening its highlights.
Click the "Show More Options" checkbox button to display all the controls in the Shadows and Highlights dialog box. Drag the Amount slider right to darken the portions of the image with glare. Drag the Tonal Width slider right to increase the range of values that Photoshop should recognize as highlights. If your photo has a lot of glare, try reducing it with higher values for this control.