Eycos USER GUIDE Bedienungsanleitung PDF herunterladen (Seite 19)

highlighted with a small green square. If the selected objects are astronomical sources,

then the associated measures will appear in the measure panel below the view (see

5.1.6.).

Selected objects, if they are graphical additions and not sources from catalogues, can be

moved around. For this, one needs to click and slide one of the small green squares that

appeared during the selection. Furthermore, if these objects are instruments field of

view (see 5.2.6 - FoV), corners can be used to perform rotations.

Panning/moving

Button: pan

Menu: Edit => Pan mode…

Short keys: Alt+Z

Mouse: Middle button

It is possible to slide an image by using the “Pan” button and then click and drag the

image in the desired direction. In order to get back to the default mode (Select), move

the mouse pointer out of the view panel.

Tip: Use the mouse middle button for doing a panning even staying in the “Select”

mode.

Zoom

Button: zoom

Menu: Edit => Zoom…

Short key: F7, F8 - F6 (pointed zoom)

Mouse: mouse wheel

Aladin enables you to zoom in and out rapidly on a portion of an image. In order to

perform rapidly, only powers of 2 factors are enabled, from 1/2048 to 2048 times. A

factor of 2/3 was added for convenience. Below a factor ¼, a nearest neighbour

algorithm is used (very “sharp” image). Between ¼ and 2/3, Aladin uses the mean,

while between 2 and 2048 times, pixels are duplicated (“large pixels”).

The zoom factor can be modified in many ways:

 By using the “zoom” button and clicking in the view (keep the SHIFT key pressed in

order to zoom out). In order to go back rapidly to the default mode (“select”) put the

mouse pointer out of the view.

 By using the mouse wheel while the mouse pointer is inside the view

 By using the contextual menu to the right of the window

 By using the main menu “Edit => Zoom”

If the image has an astrometrical calibration, zooming in will centre the image on the

current Reticle location (unless the view was locked, see below). It is therefore very

simple to zoom in on a particular object, by moving the Reticle onto the given object

(simple click) and then using the mouse wheel.

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Eycos USER GUIDE Bedienungsanleitung Seite 19