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No Preview on Shadows & Highlights Script
#1
Hi from a Gimp newbie - been using a very old version of Photoshop till now.
I installed the Shadows & Highlights script successfully (I believe) by adding the file shadows-highlights-2-4.scm to the C:\Program Files\GIMP 2\share\gimp\2.0\scripts directory, but when I use it, I do not see any option for previewing my adjustments; I only see the results after I hit the OK button. How do I preview my adjustments?
Thanks for your help - and looking forward to great things from Gimp!
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#2
Welcome to gimp-forums.

First one: Where to put scripts and plugins. What you did is ok, but not recommended. The best location is in your Gimp Profile C:\Users\your-name\.gimp-2.8\scripts for a script something.scm and C:\Users\your-name\.gimp-2.8\plug-ins for something.py or .exe or .dll

Scripts do not provide a preview whereas a plugin might. That particular script is old c.2007 What it does do, is add two layers 'fix-shadows' 'fix-highlights' and if you make the respective layer active (click on it in the layers dialog) you can then adjust the opacity which corresponds to the values you used in the script.

[Image: GapLOiz.jpg]

detached the layers dialog to make it easier to see.

I am sure there are better tools somewhere, someone is sure to recommend a plugin.

edit: You might want to look at this reference: https://www.gimp.org/tutorials/Luminosity_Masks/

and remember, Gimp is not PS forget about PS methods, Gimp has its own ways and a steep learning curve, but the end result will be the same, it depends on you.
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#3
Just to add to the excellent advice from rich2005.
I find that luminosity masks are one of the most useful ways of adjusting images.
There is a ready-made script by Saul-goode, which I have attached.
You will need to unzip it before putting in C:\Users\your-name\.gimp-2.8\scripts.
When you start GIMP you will find it in Filters/Generic.

david.


Attached Files
.zip   sg-luminosity-masks.scm.zip (Size: 1.54 KB / Downloads: 38)
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#4
(04-26-2017, 06:44 PM)rich2005 Wrote: Welcome to gimp-forums.

First one: Where to put scripts and plugins. What you did is ok, but not recommended. The best location is in your Gimp Profile C:\Users\your-name\.gimp-2.8\scripts for a script something.scm and C:\Users\your-name\.gimp-2.8\plug-ins for something.py or .exe or .dll

Scripts do not provide a preview whereas a plugin might. That particular script is old c.2007 What it does do, is add two layers 'fix-shadows' 'fix-highlights' and if you make the respective layer active (click on it in the layers dialog) you can then adjust the opacity which corresponds to the values you used in the script.

[Image: GapLOiz.jpg]

detached the layers dialog to make it easier to see.

I am sure there are better tools somewhere, someone is sure to recommend a plugin.

edit: You might want to look at this reference: https://www.gimp.org/tutorials/Luminosity_Masks/

and remember, Gimp is not PS forget about PS methods, Gimp has its own ways and a steep learning curve, but the end result will be the same, it depends on you.

Thanks Rich2005, for your speedy reply. I will relocate the script to C:\Users\your-name\.gimp-2.8\scripts and play with it. Seems like a clunky tool, so will check out other options also - like Luminosity_Masks.

(04-26-2017, 07:53 PM)david Wrote: Just to add to the excellent advice from rich2005.
I find that luminosity masks are one of the most useful ways of adjusting images.
There is a ready-made script by Saul-goode, which I have attached.
You will need to unzip it before putting in C:\Users\your-name\.gimp-2.8\scripts.
When you start GIMP you will find it in Filters/Generic.

david.

Thanks David. I will check that out!
Al
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#5
@alnuwer If you ever come back.

There is a Gimp plugin, gmic http://www.gmic.eu which combines hundreds of filters in a single package. (this is one of the few plugins that comes with an installer)

That will give you your preview and the filter Colors -> Zone system has controls for shadows and highlights

looks like this. http://i.imgur.com/gyG8Mnv.jpg
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#6
@rich2005,

You have added to my education again! While I use some of the G'MIC filters all the time, I was unaware of Zone system.
With so many G'MIC filters perhaps we need another manual to explain the use of all these!

david.
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#7
(04-27-2017, 08:11 AM)rich2005 Wrote: @alnuwer If you ever come back.

There is a Gimp plugin, gmic http://www.gmic.eu which combines hundreds of filters in a single package. (this is one of the few plugins that comes with an installer)

That will give you your preview and the filter Colors -> Zone system has controls for shadows and highlights

looks like this. http://i.imgur.com/gyG8Mnv.jpg

Wow - looks like a lifetime of learning with this plugin! Real power here. Thanks for sharing!
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#8
(04-26-2017, 07:53 PM)david Wrote: Just to add to the excellent advice from rich2005.
I find that luminosity masks are one of the most useful ways of adjusting images.
There is a ready-made script by Saul-goode, which I have attached.
You will need to unzip it before putting in C:\Users\your-name\.gimp-2.8\scripts.
When you start GIMP you will find it in Filters/Generic.

david.

I tried this filter ,but could not see that it did anything.
My .xcf is too large to upload here, but I have a link to one drive:
you can download the image and look at it and tell me if it looks like the filter processed the image or not.
https://1drv.ms/u/s!Anjgo3MYRE79yyRa9GKHaiw2BILi
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#9
@eingram25,

To use the Luminosity Masks you first have to duplicate your image. Then click Filters/Generic/Luminosity Masks. If you then look in the Channels Tab You will find 9 Luminosity Masks. You need to examine each of these in turn to find which one will adjust the area you require. You are going to add the appropriate mask as a layer mask to the top layer of your duplicated image and the white areas of the mask is where the adjustment will take place using any of the controls in the Colours Menu.
I know that, initially, this sounds complicated, but after the first time you use it all will become obvious! It provides excellent control of images.
If you need any additional help, do not hesitate, come back and I am sure I can put a simple tutorial together.

david.
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#10
(04-29-2017, 10:42 PM)david Wrote: @eingram25,

To use the Luminosity Masks you first have to duplicate your image. Then click Filters/Generic/Luminosity Masks. If you then look in the Channels Tab You will find 9 Luminosity Masks. You need to examine each of these in turn to find which one will adjust the area you require. You are going to add the appropriate mask as a layer mask to the top layer of your duplicated image and the white areas of the mask is where the adjustment will take place using any of the controls in the Colours Menu.
I know that, initially, this sounds complicated, but after the first time you use it all will become obvious! It provides excellent control of images.
If you need any additional help, do not hesitate, come back and I am sure I can put a simple tutorial together.

david.
I saw a tutorial on luminosity masks. The resultant channels looked like The channels in my picture. I guess I expected the script to do the picking for me. BTW, did both the layers and channels come through in the link I sent? I'll watch some tutorials on youtube and if I still get stuck, I'll check back with you, and many thanks for your attention and time to explain this.
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