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