How to delete the shadow part of the PNG picture in the pure version of win7?

            What is PNG? This is a picture format. If you don't set the win7 64-bit flagship iso, then in general, the screenshots we use QQ to win7 pure version are all in PNG format, presumably many Users need to use the screenshot function? But do users find that their PNG files have shadows? A user who consulted today encountered such a situation, how can we eliminate this shadow? Below, Xiaobian will answer this question for everyone!
1. First, let's press the win+r shortcut on the win7 Ultimate keyboard to open the running window of the computer. After that, let's enter in the running window. Regedit and click Enter, this will open the registry editor window of win7 Ultimate.
2. In the open win7 Ultimate registry editor window, we click to expand HKEY_CLASSES_ROOT\\SystemFileAssociations\\image in the left menu, then find the “Trection” option in the right window.
3. Let's double-click to open the "Treatment" option, and then in the pop-up edit window, we will change the default value of the numeric data to 50, the base is set to hexadecimal, after setting, we click OK Save the settings.
After completing the above settings, we need to restart the computer so that our settings can take effect.