dtdisplay on-line help

Edit Menu

Image view properties dialog

This pop-ups a dialog box to edit the image view properties.

Reflection view properties dialog

This pop-ups a dialog box to edit the reflection view properties.

Clear selected output

This deletes any highlighted text in the scrolled text area.

Del 10% lowest reflns

This deletes the 10% least intense reflections in the displayed reflection list. These reflections are not undeletable right now, but you may re-read the reflections from a file with File / Read refln list.... The edited reflection list is NOT saved to a file until you use File / Write refln list....

Erase (edit nonunf) mode

When toggled on, pixel values in the displayed image can be set to zero, as follows:

Pixels within the circle cursor (ctrl-middle mouse button) are set to zero, and the thickness of the next line cursor is set by the diameter of the circle.

Pixels along the line cursor (shift-middle mouse button) are set to zero. The thickness of the erased line is set to the diameter of the last erased circle.

Use File / Save Image As... to save the edited image. There is no undo method, except to re-load the displayed image before saving it. The edited image may be used as a Simple mask in the dtprocess Setup menu or it may be used as the second parameter to dtnonunfedit to edit a nonunf file.

Edit beam position

This pops up a message box describing how to use the cursors. Use Alt-MB2 to create a circle cursor to change the direct beam position. If one has ice or powder rings in the image, set the cursor on the ring, then press and hold Alt-MB2, then press MB1 and drag the mouse to the center of the ring (this is a two button mouse operation). When the mouse buttons are released the direct beam position will be moved there.

If the detector swing angle is not 0, one must still select the beam position as shown in the image. The selected position will be used to calculate the pixel position when the swing angle is 0 and that will be placed in the header.

Be sure to use File/Save Header As..., so that other d*TREK programs can learn of the new beam position.