Data Viewer

Introduction

The Data Viewer can display a single real or reciprocal space image with adjustable contrast. In the status bar the magnification and the last clicked pixel are displayed. Phases in reciprocal space images can be visualised using the phase color mode. The data viewer can be created and also be controlled via the Python/C++ interface. Extension of the data viewer is possible using additional overlays.

Components

Main panel

The main panel shows the image either in Real space or Fourier space. The phase colour display mode can be activated using the popup menu.

Mouse and Keyboard Controls

Mouse

Left Button	Draw Selection
Middle Button	Move Selection
Right Button	Move Image, Display popup menu
Wheel	Zoom in and out

Keyboard

N	Renormalize
C	Center
I	Invert
P	Toggle Phasecolor mode
V	Show/Hide Pixel Values
S	Toggle Selection Mode
R	Show/Hide Ruler
+,L	Zoom in
-,K	Zoom out
Z	Next Slab
X	Previous Slab
<Shift>	Update Zoom and Live FFT panel
<Control>	Modify Overlay

Zoom panel

The zoom panel shows a zoomed version of the image centered at the mouse position.

Mouse and Keyboard Controls

Mouse

Left Button	Draw Selection
Middle Button	Move Selection
Right Button	Display popup menu
Wheel	Zoom in and out

Keyboard

N	Renormalize
I	Invert
P	Toggle Phasecolor mode
V	Show/Hide Pixel Values
S	Toggle Selection Mode
+,L	Zoom in
-,K	Zoom out

Live FFT panel

The live FFT panel show a live FFT of the area centered at the current mouse position. The size of the Fourier transformed area can be adjusted using the popup menu.

Mouse and Keyboard Controls

Mouse

Left Button	Draw Selection
Middle Button	Move Selection
Right Button	Move Image, Display popup menu
Wheel	Zoom in and out

Keyboard

N	Renormalize
C	Center
I	Invert
P	Toggle Phasecolor mode
V	Show/Hide Pixel Values
S	Toggle Selection Mode
+,L	Zoom in
-,K	Zoom out

Argand panel

The argand panel shows an argand diagram of the selected pixels.

Info panel

The Info panel shows the x an y coordinates and the value of the last clicked pixel and the pixel at the current mouse position. In addition the extent of the selection box is displayed.

Mouse Controls

Right Button

Display popup menu

Python/C++ interface

The data viewer can be created and also be controlled via a Python/C++ interface. Following python code loads an image and creates a new viewer for it.

im=LoadImage("...")
v=Viewer(i)

The viewer instance v provides following methods:

• AddMark
• AddOverlay
• ClearAllMarks
• GetNormalizer
• GetOverlayManager
• GetSelection
• Renormalize
• SetAutoNormalize
• SetData
• SetName

Examples

real space image

Data viewer showing a real space image. The panels on the right show a zoomed version of the image and a live FFT.

reciprocal space image

Data viewer showing a Fourier space image. On the right side the info, argand and zoom panel are displayed. The display of the zoom panel is switched to phase color mode. The ardand panel shows the argand diagram of the selected pixels (yellow selection box).

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