Another approach that does not use Adobe DNG converter, and instead uses the free third-party tool ExifTool.
In this case, it is an AppleScript that determines if ExifTool is installed and quits otherwise. It prompts for images of type public.camera-raw-image and then using that selected RAW image, will extract its internal icon data to a temp file. It then converts that temp data into an NSImage and proceeds to set the icon image on the RAW image.
# raw_icon.applescript
# extract the icon data from an unsupported camera RAW image and then set that image
# data on its icon.
# Dependency: ExifTool (https:exiftool.org) which installs into /usr/local/bin.
# Tested: macOS Big Sur 11.6.3, Exiftool 12.37
use framework "AppKit"
use AppleScript version "2.4" -- Yosemite or later
use scripting additions
property NSImage : a reference to current application's NSImage
property NSWorkspace : a reference to current application's NSWorkspace
# get the shell so we know which source statement to use below to get PATH info
set shell to (do shell script "echo $SHELL")
if shell is "/bin/zsh" then
set XIF to (do shell script "source ~/.zshrc;/usr/bin/which exiftool")
else if shell = "/bin/bash" then
set XIF to (do shell script "source ~/.bash_profile;/usr/bin/which exiftool")
end if
if XIF is missing value or XIF is "" then
display alert "Need ExifTool installed." giving up after 10
end if
# only allow camera RAW images
set theImage to POSIX path of (choose file of type {"public.camera-raw-image"} default location (path to desktop) without invisibles) as text
# now check if the RAW image really does not have an icon set on it and quit if it does
try
# returns 13 if sips cannot extract icon from RAW image when it is not supported by camera RAW db
set ret to (do shell script "sips -i " & theImage & " > /dev/null; echo $?")
if ret = 0 then return # because image was on it
on error number -128
# user canceled
return
end try
# extract the image icon data from the RAW file
do shell script XIF & " -a -b -preview:all " & theImage & " > /tmp/XXImage.png"
set thisImg to NSImage's alloc()'s initWithContentsOfFile:"/tmp/XXImage.png"
set status to ((NSWorkspace's sharedWorkspace)'s setIcon:thisImg forFile:theImage options:0) as boolean
tell application "Finder"
delete POSIX file "/tmp/XXImage.png" as alias
if status then reveal POSIX file theImage as alias
end tell
return
For the Nikon Z fc RAW image:
From:
To:
