FreeImage is an "easy to use, fast, multithreading safe, compatible ... and cross-platform" OSS library for image manipulation. I have made a set of REALbasic wrapper classes for FreeImage that make many of its capabilities trivial.

The use of this wrapper is free, but if you build upon the functionality or improve it, please pass along the changes to me so I can incorporate them into my version.

To illustrate the ease of use, here is a simple bit of code to perform a few actions:

  Dim f as FolderItem = GetFolderItem( "foo.jpg" )
  Dim img as FreeImage = f.FI_Load
  
  img = img.Rescale( 1024, 768 )
  img = img.Greyscale
  
  If img.Save( "foo.png", FI_Format.PNG ) Then
    MsgBox "Saved to foo.png."
  End If

The newest version (v20080312) adds 40 methods and enums and includes a few changes to the structure or cleanliness of the code.

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file	description	size
FreeImage Wrapper	The FreeImage class and Mod_FreeImage module necessary for wrapping FreeImage along with a small sample application.	20K
FreeImage Wrapper, v20070423	An updated FreeImage Wrapper class as of April 23, 2007, with added methods for additional functionality. This version has not been exhaustively tested and should therefore be considered beta.	20K
FreeImage wrapper, v20080313	The first major update to the wrapper, adding a good number of capabilities not present before. Also includes complete documentation.	192K