You will need
- - Photoshop CS.
To improve clarity on some small stations use the Sharpen tool in the sidebar. It looks like the figure of a triangle. If you do not see this icon, find the drop, or a hand with an elongated thumb are tools of the same group. Click on any of them, right-click and from the drop down menu you will see a triangle. Activate it by pressing the left mouse button.
In the top bar, open the Brush option and select the diameter, hardness and shape of the brush. Adjust the blend mode (Mode) and the degree of the effect of Strength. Brush over the target areas.
Open the Filter menu. Select any of the filters of direct action: Sharpen, Sharpen Edges, or Sharpen more. After selecting any of them you will immediately see the result, which can automatically give the command. Try to apply all filters at a time. You can also re-select any of the filters, which also will affect the picture.
For more efficient work use tools for fine-tuning Smart Sharpen or Unsharp Mask. Select one of them. The first is the same effect on the whole image, the second more on the areas with a significant difference in colors of neighboring pixels (contours). Put a tick in the square Preview, then you will immediately see the result.
In the filter window with the mouse, move the image to better see important objects. Change the Amount parameter, which determines the enhancement of contrast between pixels. Usually, optimally from 100 to 200%.
Move the Radius slider to determine the width of the comparison tones. For individuals this rate is usually set from 1 to 3.
In the Smart Sharpen box in the Remove specify what kind of blur you want to remove, and put a checkmark in the box More Accurate. In the Unsharp Mask Threshold parameter set from 2 to 8.
Work with sharpness on the image in real size and resolution. Otherwise when you change these settings, the result can be distorted. Abuse of the sharpen filters leads to the effect of "posterization" when a reduced number of colors, and the image becomes grainy or look like a hand drawn poster.
Any tool you can apply to the entire image and to its individual parts (you need to pre-allocate them). All the parameters mentioned about, they need to be set empirically for each image and follow the current result.