Editing In ImageJ

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Editing In ImageJ

• John H. Krantz
• Hanover College

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Outline

• Using ImageJ
• Basics
• Opening Images
• New Images
• Drawing
• Basic Image Editing
• Advanced

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Example JPGs I will Edit
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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

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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.

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File/New
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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

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File/Open
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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

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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 dont destroy original

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Cropping or my Thumb got in the way well not
really
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Select Area Select square on Tool Box
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Cropped Image What thumb?Under Image Menu Crop
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Basic Editing for Web

• Resizing Image For Fast Download
• Under Image/Scale or Image/Adjust/Size

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Saving Images
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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

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Selecting Region to Edit
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Brightness and ContrastImage/Adjust/Brightness
and Contrast
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Converting Images

• Converting Color Depth or to Grayscale image
• Under Image Menu/Type
• To grayscale image, convert to 8 Bit

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Filtering Images

• Gaussian blurs
• Amount of blur depends upon the standard
  deviation (called radius)

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Filtering Images

• Edges finds them so type of outline

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Adding to Images

• Setting Colors
• Edit Options Foreground Color
• Image Colors
• Adding Text
• Set font in
• Edit Options Font
• Draws in selected color

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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

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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

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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

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Adding Shortcuts Example

• Pick command JPEG
• This saves files in a jpeg format
• A pain to get to usually
• Use J
• Try ctrl-J

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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