All the parameters of an image object are displayed in its properties window where you can edit them accurately.
To change the properties
Select the object and perform the following operations:
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Open the Properties dialog box in one of the following ways:
Double-click on the object.
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Press the key combination ALT+Enter.
Click the button in the toolbar.
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Activate the context menu with the right mouse button and choose the command Properties.
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Modify the parameters of the object. To preview the changes, click the Apply button.
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Click on OK.