Change style manual

docs/src/user/manual/Image-style.md

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+# How to change the image styles in QGIS symbology
+
+**To change the image styles in QGIS symbology, follow these steps:**
+
+Open QGIS and Load your Project: Start QGIS and open your existing project.
+
+1. **Select the Layer Properties:** In the Layers panel, right-click on the layer for which you want to change the symbology and select `Properties`.
+
+![Properties](./img/image-style-1.png)
+
+2. **Open the Symbology Tab:** In the Layer Properties dialog, click on the `Symbology` tab on the left side.
+
+![Symbology](./img/image-style-2.png)
+
+3. **Adjust Contrast Enhancement:** Locate the settings for contrast enhancement. In the contrast enhancement dropdown, select the `Stretch to MinMax"` option.
+
+![Contrast](./img/image-style-3.png)
+
+4. **Configure Min/Max Value Settings:** Click on the `Min/Max value setting` to view more options. Choose the `Mean +/- standard deviation` option.
+
+5. **Apply/OK Button:** Click `Apply` to apply the changes and continue making adjustments. Alternatively, click `OK` to apply the changes and close the Layer Properties window.
+
+By following these steps, the user can enhance the image quality and make it appear more realistic.