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Editing In ImageJ
John H. KrantzHanover College
Outline
Using ImageJ Basics
Opening Images New Images Drawing Basic Image Editing
Advanced
Example JPGs I will Edit
ImageJ
Free at: http://rsb.info.nih.gov/ij/index.html
Overview Java program Interface a bit awkward because it is free Expandable via plug-ins
Covers all basic editing and many advanced - very advanced
Scientific quality image editor Used in many technical applications
Basic ImageJ Interface
Menus and Tool bars File Open, Save, Save As, Revert Edit Cut, Copy, Paste, Selection,
Options Image Basic Image Editing Process More Advanced Image Editing
Options Shapes are for selection or drawing. The
“A” is for adding text.
File/New
Drawing with ImageJ
Very simple but easy Access to pixels No anti-aliasing in most drawing
modes Downside: jaggies Upside: in complete control of
graphics Can store and edit in lots of
formats
File/Open
Try some
When open in ImageJ, all images are bitmaps, but can be edited in different types
Basic Graphics Objects Adding Text Saving in Different Format
File/Save As Important: Must use File/Save As every
time not saving the file as a bitmat
Basic Editing in ImageJ
Edit a bitmap Most Important Command: Revert
Under the File Menu Takes back to last save – careful with
saves. Ctrl-z is undo but only one step.
Suggest make copy first so don’t destroy original
Cropping or my Thumb got in the way – well not really
Select Area Select square on Tool Box
Cropped Image – What thumb?Under Image Menu: Crop
Basic Editing for Web
Resizing Image For Fast Download Under Image/Scale or
Image/Adjust/Size
Saving Images
Converting Images
Save as for Image Types – use GIF or JPG Must add extension, it is not added
automatically Always use save as to save anything
other than a TIFF This is a full color uncompressed image
Selecting Region to Edit
Brightness and ContrastImage/Adjust/Brightness and Contrast
Converting Images
Converting Color Depth or to Grayscale image Under Image Menu/Type To grayscale image,
convert to 8 Bit
Filtering Images
Gaussian: blurs Amount of blur
depends upon the standard deviation (called radius)
Filtering Images
Edges: finds them – so type of outline
Adding to Images
Setting Colors Edit: Options: Foreground Color Image: Colors
Adding Text Set font in
Edit: Options: Font Draws in selected color
Adding to Images
Drawing a basic graphics object Draw width:
Edit: Options: Line Width Select shape Put shape on image Edit: Draw or ctrl-D
Filled regions Same as above, but:
line width not important Use Edit: Fill or ctrl-F
Plugins
These are the heart and sole of ImageJ Some have limits but as developments
go on, you will be able to get new ones without these limits
How to get: http://rsb.info.nih.gov/ij/plugins/ Pick desired plug in. Go to ImageJ folder, then to plugins folder I suggest making folders under this to keep
organized Restart ImageJ
Creating Shortcuts
Under Plugins menu Pick Shortcuts Then Create Shortcut Lists all commands Type letter that will be matched with
control button. Under Plugins/Utilities/Shortcuts will
show all current shortcuts
Adding Shortcuts Example
Pick command JPEG This saves files in a jpeg format
A pain to get to usually Use “J” Try ctrl-J
Mail List
http://rsb.info.nih.gov/ij/list.html Active community of people
developing They are very tolerant of idiotic
questions. I have personal experience of their tolerance