To improve image quality, you require a personal computer, a digital version of the photo and the photo-editing program. The most versatile and popular program for photo editing - Photoshop. But if you want to do simple photo editing, you can use the standard program “Microsoft Office Picture Manager”.
Start Photoshop and load the desired photo on which you want to make necessary adjustment or alterations. To open the download dialog, use the key combination Ctrl + O. This dialogue box is nothing other than having a picture preview, no different from those used in other applications.
Try to make a duplicate layer of the selected photo after pressing the key combination Ctrl + J. Regardless of the photo file format, a background layer editing these images saves the changes made after regular intervals.
If the goal is to improve the quality of editing photos, please go to "Correction" in the "Image" menu editor. There you will find more than two dozen tools to edit image. Many of the names will be quite familiar to you as they clearly ask you about which parameters of the photograph you want to edit such as "Brightness / Contrast", "Hue / Saturation" and other actions.
Clicking on most of the icons provides you some additional options for image alteration and editing. For example, if you click on the icon "Brush Tool" in the "Options", you will be able to choose it form, size, transparency and with the icon at the bottom of the toolbar, you can open a palette of color choices.