Probably Kevin will come up with a script. Looking at what us lesser mortals can do with what is available, my tuppence worth.
The snag is the .xcf requirement. Using the command line imagemagick would be great except it does not write xcf files.
In Gimp there are 2 GUI batch plugins. BIMP and the old DBP Neither do the whole job but you could use one after the other.
BIMP does
Convert to grayscale
Resize and set the new 300 ppi
Rename with a -300 tacked on the name.
What it does not do is re-save in xcf format.
DBP (Davids Batch Processor) The bit that is missing from DBP is the 300 ppi requirement, but it does save as .xcf
After running BIMP to new files, run DBP on the new files with just the one option - save as xcf.
A quick test here with a half-dozen files is good. A bit of a round-a-bout but better than one file at a time.
Question - Are you really running WinXP and what is the Gimp version you use?
The snag is the .xcf requirement. Using the command line imagemagick would be great except it does not write xcf files.
In Gimp there are 2 GUI batch plugins. BIMP and the old DBP Neither do the whole job but you could use one after the other.
BIMP does
Convert to grayscale
Resize and set the new 300 ppi
Rename with a -300 tacked on the name.
What it does not do is re-save in xcf format.
DBP (Davids Batch Processor) The bit that is missing from DBP is the 300 ppi requirement, but it does save as .xcf
After running BIMP to new files, run DBP on the new files with just the one option - save as xcf.
A quick test here with a half-dozen files is good. A bit of a round-a-bout but better than one file at a time.
Question - Are you really running WinXP and what is the Gimp version you use?