Using FastStone Capture, we can get screen shots of Active window, Window/object, Full screen and Scrolling window.See the figure below and use these buttons to get screen shots. Also, you can add watermarks for images and Zoom a region using Screen Magnifier.
When you click on the button in right hand corner (Go to Settings), you will see Screen Magnifier and Screen color picker. This Screen Magnifier can be used to zoom a selected region. So, click on Screen Magnifier then click on the region that you need to Zoom in. By clicking Screen color picker, you can identify the color of the specific locations, it provides color as a RGB (red green blue )value and with Decimal and Hexadecimal values. This color identification process can be used to identify any color even if yout eyes are not sensitive.
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