bearz314/MacOS9-icons

Classic Mac OS 9 icons

MacOS9-icons

Classic Mac OS 9 resource icons

About the resources

More write-ups in a blog post here: https://blog.warmwolf.com/2020/05/classic-mac-os-9-icons

1. rsrc

• Original .rsrc files extracted by NazoraioiSkadinaujo (DeviantArt).
• It seems impossible to find an application that can open rsrc files nowadays.

2. icns extracted_from_rsrc

• Binary data (containing icns) can be extracted from the rsrc file from the macOS resource fork rsrc.
• The icns files are 260 bytes into the binary data.
• The extraction can be carried out with the following Bash script:

for filename in *.rsrc; do
    cp $filename/..namedfork/rsrc $filename.icns
    dd if=$filename.icns of=$filename.offset.icns bs=260 skip=1
done

• The latest MacOS Catalina seems to not like these icns files, saying that It may be damaged or use a file format that Preview doesn’t recognise.
• As such, this does not work: sips -s format png $filename.offset.icns --out $filename.png

3. png

• The icns files are converted to png with the online service CoolUtils.
• Size: 512x512

4. png 64px

• png files downsized to 64x64 with Photoshop.

5. icns fixed

• The png files are converted to valid icns files that Catalina is happy with.

for filename in *.png; do
    mkdir $filename.iconset
    mv $filename $filename.iconset/icon_512x512.png
    iconutil -c icns $filename.iconset
done

Icons

(Yes, I know icon 63 is missing.)