Adjusting the Image Position

You can edit the Modes numbers if the screen image does not properly center or fill the monitor screen. Be sure to center the image before stretching or shrinking it. Any adjustments you make will go into effect after restarting the X server. Centering the Image: The Pixels Displayed numbers must match the desired physical screen resolution. The Sync Start and Sync End numbers must be increased or decreased (to move left or right; up or down) at the same time and by the same amount, and stay within the range of the Displayed and Total values.

• Image too far right: To adjust an image that is too far to the right, increase the Horizontal Sync Start and Horizontal Sync End values equally.
• Image too far left: To adjust an image that is too far to the left, decrease the Horizontal Sync Start and Horizontal Sync End values equally. For example, to adjust an image that is too far to the left, you could begin the process by adding 8 to the two horizontal timing numbers (Sync Start and Sync End). Make sure that the Sync End number does not exceed the Horizontal Total number. The same technique applies for vertical positioning:
• Image too low: To adjust an image that is too far to the bottom, decrease the Vertical Sync Start and Vertical Sync End values equally.
• Image too high: To adjust an image that is too far to the top, increase the Vertical Sync Start and Vertical Sync End values equally. For example, to adjust an image that is too high, you could begin the process by adding 8 to the two vertical timing numbers (Sync Start and Sync End). Make sure that the Sync End number does not exceed the Vertical Total number.

Stretching or Shrinking the Image: The Pixels Displayed numbers must match the desired physical screen resolution. The Total value is increased or decreased to stretch or shrink the image. In addition, to hold the center position, the Sync Start and Sync End numbers must be increased or decreased equally, based on one-half of the difference in the changed Total value. For instance, if you added 10 to the Horizontal Total value, you would also add 5 to the Horizontal Sync Start value and 5 to the Horizontal Sync End value.

• Image too narrow horizontally: To stretch an image that is too narrow horizontally (extra space appears on the left and right), increase the Horizontal Total by amount x, then add one-half of x to both the Horizontal Sync Start and Horizontal Sync End values.
• Image too narrow vertically: To stretch an image that is too narrow vertically (extra space appears on the top and bottom), increase the Vertical Total by amount x, then add one-half of x to both the Vertical Sync Start and Vertical Sync End values.
• Image too wide horizontally: To shrink an image that is too wide horizontally (the image extends beyond the left and right edges), decrease the Horizontal Total by amount x, then subtract one-half of x from both the Horizontal Sync Start and Horizontal Sync End values.
• Image too tall vertically: To shrink an image that is too tall vertically (the image extends beyond the top and bottom edges), decrease the Vertical Total by amount x, then subtract one-half of x from both the Vertical Sync Start and Vertical Sync End values.