Several Apple apps including the basic Preview from Mac OS X can access icons from ICNS package and export the individual icons as normal images. Just make sure you export the icon of the file size you want and save it as TIFF file.
Convert Apple icon graphic format to Aldus Tagged Image File Format (TIFF) bitmap image.
We found 2 software records in the database related to .icns to .tiff file format conversion.
Articles and other information relating to icns into tiff conversion:
How to get png or jpg icon from an app on Mac - Export icons from ICNS file format to PNG or JPG images on your Mac by using Finder and default OS X Preview app.
Apple macOS / Mac OS X software - convert icns to tiff on OS X
A basic document and image viewer in Mac OS X
Convert from icns file format
|Yes, Preview supports icns file conversion as a source file type.||Yes||No||No||No||No||Yes||No|
|Yes, Preview supports tiff file conversion as a target file type.||Yes||No||No||No||No||Yes||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned icns to tiff. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A great icon organizer and tool for Mac OS X