On samedi 25 juillet 2020 09:15:21 CEST tony Hamilton wrote:
> Correct, previously I was trying to get monochrome applied
> automatically. But, aside from knowing that I was not trying to do that
> in this case, please note that I have not said the whole image is in
> monochrome; only a selection of pixels have turned a sort of 'polluted'
> grey - with, apparently, some red in them. 

When you have defined a preset to be auto-applied, it will be applied whenever 
you open an image for the first time in the darkroom (provided the image 
matches, of course)

> I don't see how this can be
> the result of some preset as, as part of this learning exercise, I have
> performed a clean install of DT and all my test images, newly copied
> from LightRoom.

A clean install means that you also removed the old database and configuration 
files? Note that some of these can be hidden (~/.config/darktable/* under 
linux, no idea where to find such files for MS-Windows).

> None of this answers the question of how did the
> monochrome module get into the history stack in the first place. 

Well, that part *was* answered by Patrick Shanahan...
As you seemed to have set up a preset to be auto-applied to "matching images", 
that preset will still exist, *and be applied*, when you just re-install the 
program.
Btw, did you follow the suggestion from Patrick, starting darktable with 
"  darktable --library :memory: "? 
Among other things, you won't get any preset applied on importing an image/
folder.

> Of
> course one valid explanation is that I am so intellectually stunted that
> I do things  without realising it or perform actions with no idea of
> their consequences. If this were the case,  would I be able to use DT at
> all?

I'd rather not comment on this.

Remco





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