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+--- Thread: ofn-luminosity-masks (/Thread-ofn-luminosity-masks)
ofn-luminosity-masks - Ofnuts - 11-14-2019
My own take on luminosity masks. While it pays its dues to PatDavid's canonical tutorial on the subject, it creates the same masks using a different and (hopefully) more efficient method that allows:
- to create a luminosity selection from the current layer in one single click (or one keystroke if you defined shortcuts)
- in a future version, to define your own masks
* Only PatDavid's masks, no custom masks yet
* Only for Gimp 2.10 (seems to hit a bug in 2.8)
Enjoy.
RE: ofn-luminosity-masks - Blighty - 11-14-2019
The link needs to be corrected, it goes to a log-in page.
I did download from the usual place.
(This post can be deleted once link is corrected)
RE: ofn-luminosity-masks - Krikor - 11-14-2019
Link ok.
This is the third Ofnuts plugin I am the first to download! :-)
RE: ofn-luminosity-masks - Blighty - 11-14-2019
The DDD mask is selecting whites. (DDD is the only one I have tested.)
What I did:
Create a DDD mask and bucket fill with red.
Did the same for the Tin Tran version for comparison.
RE: ofn-luminosity-masks - Ofnuts - 11-14-2019
To see the mask, you can just use `Selection>Selection Editor (and enlarge the window...).
Found the problem, slight typo in the curve values. Will publish later today, in case another minor thing surfaces.
[attachment=3435]
After the fix: The front of the engine, in black, like the sky and the platform, are not in the selection.
RE: ofn-luminosity-masks - Krikor - 11-14-2019
Comparing the expected result (left) with the one obtained, one can notice a slight difference in the middle tones. (Maybe because I created xcf in version 2.10.12 and tested this script on 2.10.14)
But in DDD the difference is quite big.
Lights
[attachment=3436]
Mids
[attachment=3437]
Darks
[attachment=3438]
RE: ofn-luminosity-masks - Ofnuts - 11-14-2019
As noted there is a bug in DDD. If you want to fix it, before I republish replace the line:
Code:
('Darks/DDD', 'Standard mask',[0.00,1.00,0.33,0.00,1.00,0.00]),The buggy DDD is more or less DDD+LL.
One can also ask what is the "expected" value, since no script strictly follows the original tutorial.
RE: ofn-luminosity-masks - Krikor - 11-14-2019
(11-14-2019, 03:40 PM)Ofnuts Wrote: As noted there is a bug in DDD. If you want to fix it, before I republish replace the line:
Code:
('Darks/DDD', 'Standard mask',[0.00,1.00,0.33,0.00,1.00,0.00]),
The buggy DDD is more or less DDD+LL.
One can also ask what is the "expected" value, since no script strictly follows the original tutorial.
After the change, the DDD is as expected! :-) (not speaking strictly)
I have tried to say that similar to the results obtained with both the Saulgoode script and those presented on Pat David's page.
This script gives me a lot of fun, thanks so much for updating it Ofnuts!
RE: ofn-luminosity-masks - Ofnuts - 11-16-2019
Uploaded a new version. Added feature; define your own mask(s) in a side file. Enjoy.
RE: ofn-luminosity-masks - Krikor - 11-16-2019
(11-16-2019, 06:14 PM)Ofnuts Wrote: Uploaded a new version. Added feature; define your own mask(s) in a side file. Enjoy.
Ofnuts,
But what if the curve also has points on other RGB channels?
The image shows the configuration of my curve. If I only use the values from line # 9 after Points 34, would it be enough for the mask to represent the curve?
[attachment=3444]
I defined my mask without using the points of the Red, Blue and Green curves. There was a closeness to what I expected.
[attachment=3445]