Hi,
I updated my Luminosity Mask Drive-Thru (LMDT) 2.10 plugin to Gimp 3 RC 1.

The plugin was tested on Windows 10, but should work with Linux. LMDT is designed to create luminosity mask for selected layer with and without a selection.




Here is plugin:

Hi Charles.
I have a small problem with this plugin:

And a small suggestion - remove the file extension in the layer name (e.g. .png) before adding the mask name.
Simple code for Gimp-2.10.xx:


Big applause to the leader in porting Python plugins to Gimp 3.

Thank you Mr. Q. for your suggestion. I thought about it, but I think reflection is the best way to go. There's the possibility that user has named their layer, 'My Layer.Mr Polecat'.

I fixed a problem with the 'Selection Channel' option. I hadn't quite rapped my around the option. In v2.01, LMDT correctly generates the alpha channel mask based on the component type during layer masking. I also renamed the "Selection Channel" to 'Alpha Channel'.

Here in the layer dock, the mask changes per the "Alpha Channel" option.


I've added the Alpha Channel compenent to the mask-type fail Gimp message:


Here is the LMDT version 2.01.

Here is an image of LMDT's v2.01 dault dialog.

Mr. Q and interested parties,

Was the problem you were referring to the language translator? I fixed the missing translator in this version, 2.02. While I was at it, I found a bug where some mask-type generation failures were not reported.

Mask-type aren't guaranteed to create a mask, because these mask-types are based on pixel luminosity. For example, a completely black image will cause all of the Light and Midtone group mask-types to fail.

As an alternate to mask-type failure, the plugin could generate a black mask, but why create a mask that basically does nothing?

Here is the LMDT v2.02.

Always willing to give a try-out, although a quick one, looks good.
This using a linux (kubuntu 22.04) Gimp 3.0 RC1 appimage (ivan-hc appimage)



Seems to work OK. Adjusting using Curves
You could add to the read-me, a reminder for linux users to make the .py files executable.

Thank you Rich2005 for your help. I've fixed a couple of flaws with the Midtone mask generation. I've updated in the "Read Me.txt". Mr. Q was on to it, one of the flaws was causing the Minimal mask-type to frequently fail.

This is a sample screenshot after a LMDT run with all Midtones selected.


Here is the Python plug-in LMDT v2.03:

Thanks for the update.

Using a dot in the layer name is of course a user choice (which I will gently call a "ridiculous" decision).
Using LMDT for taken photos will always be loaded with the extension - so maybe only as an option: should I remove the extension from the layer name? (default YES)

Theoretically it is possible to create 56 masks (14 type mask x 4 type alpha chanel) and to achieve this you need to run the plugin 4 times and click 15 times.
So one more 'crazy' option to consider (yes - only for the lazy) - should I create all possible masks?
Sorry for the comments I try to refrain from - but sometimes I forget about it.

I've images stored from my very old camera with the picture number and filename of the format 7640.img.jpg which will be the layer name when opening the file in gimp
For non camera files I often use many dots to record the settings used so I can go back and repeat the results so put them in the layer name which is then used for the exported filename e.g. test01-point-distance-0.14-z-0.75

In case it's of any use here's what I use in plugins for gimp 2.10, python2 to remove the file extension:

The crazy option is now available in LMDT v2.1. I've added switches to the mask-groups and to the Alpha Channel. In order to make the options sane, I've also added a Group option.


The Group option organizes output and makes it easier to compare Alpha Channel mask.


Here is LMDT 2.1:

Content removed because no longer relevant to users.
Version 2.13 works as expected.

Thank you very much MareroQ for your help. I believe I've fixed the inverted layer naming problem.


Here is LMDT 2.12 with the fixes.

Content removed because no longer relevant to users.
Version 2.13 works as expected.

Thanks again, Mr. Q. I believe I've got it fixed this time. I did some additional factoring, so that helps me get to a correct solution.

LMDT automatically removes empty mask groups which occur when the mask-types fail. The problem with the Midtones was an inverted option check. One line of code, and it all goes wrong.


LMDT v2.13:

Yes, Cowboy. That was a bullseye.

There's a fix for layer opacity. Tested on Windows 10, Gimp 3 RC3.

Thanks for the plugin and the "read-me". I could not get it going until I read the read-me about the .py thing as I am using Linux.

Windows 10, Gimp 3.0. 2-1, The LMDT gimp plugin works perfectly for me. Thanks gasMask.

Similarly, no problems here using Windows 10 - thanks for a useful (and usable) plug-in