Editing In ImageJ John H. Krantz Hanover College

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

Example JPGs I will Edit

ImageJ Free at: 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 Contrast Image/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: 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 Active community of people developing They are very tolerant of idiotic questions. I have personal experience of their tolerance