© 2022 Jasper van Baten, AmsterCHEM

Scanning for symbols mode

To automatically find all similar symbols, you must make sure you are in Scanning for symbols mode. You can select Scanning for symbols mode from the Edit menu, or from the mode selection in the top left of the window.

You can only enter Scanning for symbols mode if your axes have been defined.

Start with properly selecting the symbol you want to scan for. To do this, first click in the center of a symbol, when the window size is set appropriate to the symbol size (in pixels). You can see the scan window as a box in the Zoom View.

tracing a curve

Once you have clicked in the center of a symbol, a window will pop up showing a zoomed in version of the symbol. Here, you can modify the reference symbol until it looks good:

tracing a curve

The symbol should appear with a black foreground color. If this is not the case, the symbol color detection failed and you will need to click with the right mouse button on a pixel that you are sure is part of the symbol. From the menu that pops up, choose to set that pixel as reference color.

You want to select a symbol that is free of other graphics, such a curve that goes through the symbol. If there is no such symbol, select the cleanest you see, and in the symbol window remove the parts that are not part of the symbol with the left mouse button. If there are larger areas, separate them from the symbol using the left mouse button. Then click with the right mouse button on the group of pixels you want to erase. Choose Erase connected pixels from the menu that pops up.

When you are ready to scan for symbols, press OK. ScanIt will analyze the image and after a short wait (press Esc to cancel) a window will appear. At the same time, symbols appear in your image.

tracing a curve

Not all symbols can always be perfectly matched; if the shape deviates to much from the symbol initially selected or the symbol is obscured by other data in the image, the match will have a higher deviation. Drag the slider to the right to get more symbols, or to the left if too many items have been detected as a symbol that are not. The tickmarks at the bottom of the slider show the positions at which symbols will be accepted or removed. To remove the next symbol, click the arrow button on the left. To add the next symbol, click on the arrow button on the right. Click OK to accept.

See also: Defining your axes, Manual pick mode, Trace curve mode.

INDEX
.BMP
.GIF
.JPG
.PNG
.SID
.TIF
.TXT
Acknowledgements
Adjusting data points
Axes definition
Background color
Bitmap file
Black and white filter
Brightness
Clipboard
Contrast
Coordinates
Creating a data set
Crop
Curves
Data files
Data format
Data sets
Defaults
Defining your axes
Deleting data
Disclaimer
Editing data
Erasing data
Exporting data
Filtering your image
Format
Getting started
Graphics Interchange File format (GIF)
Gray scale filter
Highlighting edges of colored regions
Hot keys
Importing images from other applications
Introduction
Inverting colors
JPEG files
Keyboard shortcuts
License
Lines between data points
Logarithmic axes
Manipulating data
Manually picking points
Marker color
Marker size
Mode
Moving data points
New data set
New window
Opening documents
Opening images
Pasting images
Picking points
Portable Network Graphics (PNG)
printf format strings
Reducing color resolution
Removing data
Removing noise
Resampling data
Saving documents
Saving your image
ScanIt Document files (SID)
Scanning for symbols
Scanning points on a curve
Selected marker color
Selecting data
Shortcut keys
Significant digits
Snap
Sorting data
Starting a document
Symbols
System requirements
Tagged Image File Format (TIF)
Text files
Trace recursion level
Using your data in other applications
Zoom View
CONTENT
 Welcome to ScanIt
 The document windows
 Storing and loading documents
 The Zoom View
 Preparing your image
 Gathering data
 Defining your axes
 Manual pick mode
 Trace curve mode
 Scan for symbols mode
 Manipulating data
 Using data in other applications
 Options
 Keyboard shortcuts
 Disclaimer and license