Re: [Gimp-user] How to highlight regions of an image

[Guy Stalnaker via gimp-user-list]

David,

The technique appears to rely on GIMP's Layers. That's where the the mode
in question will be. So, where is that? Here is an image of the main GIMP
screen (Windows install) with arrows pointing to the Layers "dock" -
usually by default on the right side of the GIMP layout - and the Mode
selection dropdown menu:

[image: image.png]

A mode does nothing on a single layer. They require a minimum of two. The
selected mode performs (yes, really) a mathematical calculation pixel by
pixel between the two layers with the result of the calculation what you
see. Here's a screen shot with a new white layer added, and the Mode menu
activated with arrows showing where Multiply is:

[image: image.png]

Modes are very useful. And frankly knowing the calculation performed is
less useful than simply playing with them to see what happens when various
modes are selected. Here are links for some web pages that explain modes
you may find useful (don't worry if the website talks about Photoshop, etc.
because blending modes are somewhat uniform across applications):

2. Layer Modes (gimp.org)


Complete guide to
Layer Blending Modes in Photoshop, written, video + free ebook -
PhotoshopCAFE


Ultimate
Guide to Blending Modes | Art Rocket (clipstudio.net)


Blending Modes
Explained - The Complete Guide to Photoshop Blend Modes
(photoshoptrainingchannel.com)


Photoshop Layer Blend Modes Explained (digitalphotomentor.com)


Blend modes - Wikipedia 

Layer Blend Modes (foundry.com)


Hope this helps!

--

“Happiness is the meaning and the purpose of life, the whole aim and end of
human existence.”

― Aristotle


On Wed, Sep 22, 2021 at 5:59 PM David Karr via gimp-user-list <
gimp-user-list@gnome.org> wrote:

> (Hopefully this isn't a duplicate.  I tried to post this a few minutes ago
> a different way, and I think it failed.)
>
> I am a gimp newbie. I don't use it often enough. I'm trying to do something
> that I'm certain many people have asked about in the past, but I can't find
> this described in a current FAQ.
>
> I found the current page: https://gimplearn.net/viewtopic.php?t=49 , but
> it
> doesn't appear to be up to date with the latest gimp version (which I
> installed a few minutes ago).  For instance, after copying the foreground
> color onto the selection, it talks about setting a "Multiply" layers mode.
> I don't see anything like that in the current interface.
>
> What is the current guidance for doing something simple like this?
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Re: [Gimp-user] How to highlight regions of an image

[David Karr via gimp-user-list]

On Thu, Sep 23, 2021 at 8:38 AM Guy Stalnaker  wrote:

> P.S. One potential issue -- make sure in the Layers Dock that you have the
> correct layer selected! Think the first layer is the "base" layer, and the
> one with the selection your second layer. The Multiply mode must be done to
> the second layer.
>

And how do I do that?  I notice that when I click on the highlighted
region, the decorations I see on the region alternate every other click.
Otherwise, I see no indication how I can select particular layers.

> Guy
> On 9/23/21 10:02 AM, David Karr via gimp-user-list wrote:
>
> On Wed, Sep 22, 2021 at 6:55 PM Liam R E Quin  
>  wrote:
>
>
> On Wed, 2021-09-22 at 15:59 -0700, David Karr via gimp-user-list wrote:
>
> .  For instance, after copying the foreground
> color onto the selection, it talks about setting a "Multiply" layers
> mode.
> I don't see anything like that in the current interface.
>
> It's the 14th entry in the layer mode.
>
> Open the Layers dialogue:
> Windows/Dockable Dialogs/Layers
>
> At the very top of the dialogue is "ModeMormal"
> with a small  triangle probably, next to Normal.
>
> Click anywhere on that whole Mode  Normal control and you'll see a list
> of layer modes pop up, starting with Normal, Colour Erase, Dissolve,
> and so on, and some  way down is Multiply.
>
>
> Ok, that and Guy's response was very helpful. However, now I'm finding that
> this simply doesn't do what that other page describes. After I set it to
> Multiply mode, nothing happened. It's been a few hours since I set this up,
> and just tried setting that mode now. I made sure I had clicked on the
> selected region before setting the mode. What could I have done wrong?
>
> The following shows a small excerpt of what I'm looking at. The yellow
> portion has text below it.
>
> [image: image.png]
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>
> --
> --
>
> “Happiness is the meaning and the purpose of life, the whole aim and end of 
> human existence.”
>
> ― Aristotle
>
>
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Re: [Gimp-user] How to highlight regions of an image

[Guy Stalnaker via gimp-user-list]

P.S. One potential issue -- make sure in the Layers Dock that you have 
the correct layer selected! Think the first layer is the "base" layer, 
and the one with the selection your second layer. The Multiply mode must 
be done to the second layer.


Guy

On 9/23/21 10:02 AM, David Karr via gimp-user-list wrote:

On Wed, Sep 22, 2021 at 6:55 PM Liam R E Quin  wrote:


On Wed, 2021-09-22 at 15:59 -0700, David Karr via gimp-user-list wrote:

.  For instance, after copying the foreground
color onto the selection, it talks about setting a "Multiply" layers
mode.
I don't see anything like that in the current interface.

It's the 14th entry in the layer mode.

Open the Layers dialogue:
Windows/Dockable Dialogs/Layers

At the very top of the dialogue is "ModeMormal"
with a small  triangle probably, next to Normal.

Click anywhere on that whole Mode  Normal control and you'll see a list
of layer modes pop up, starting with Normal, Colour Erase, Dissolve,
and so on, and some  way down is Multiply.


Ok, that and Guy's response was very helpful. However, now I'm finding that
this simply doesn't do what that other page describes. After I set it to
Multiply mode, nothing happened. It's been a few hours since I set this up,
and just tried setting that mode now. I made sure I had clicked on the
selected region before setting the mode. What could I have done wrong?

The following shows a small excerpt of what I'm looking at. The yellow
portion has text below it.

[image: image.png]
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--
--

“Happiness is the meaning and the purpose of life, the whole aim and end of 
human existence.”

― Aristotle

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Re: [Gimp-user] How to highlight regions of an image

[Guy Stalnaker via gimp-user-list]

David,

The image did not post (at least I do not see it here or on the 
archives. If you'll resent to me personally, I'll take a look for you. 
My post with the images I attached made it to you, but also did not make 
it to the archive (the images are too large I suppose).


Also, what is the URL for the "other page?"

Thanks.

Guy

On 9/23/21 10:02 AM, David Karr via gimp-user-list wrote:

On Wed, Sep 22, 2021 at 6:55 PM Liam R E Quin  wrote:


On Wed, 2021-09-22 at 15:59 -0700, David Karr via gimp-user-list wrote:

.  For instance, after copying the foreground
color onto the selection, it talks about setting a "Multiply" layers
mode.
I don't see anything like that in the current interface.

It's the 14th entry in the layer mode.

Open the Layers dialogue:
Windows/Dockable Dialogs/Layers

At the very top of the dialogue is "ModeMormal"
with a small  triangle probably, next to Normal.

Click anywhere on that whole Mode  Normal control and you'll see a list
of layer modes pop up, starting with Normal, Colour Erase, Dissolve,
and so on, and some  way down is Multiply.


Ok, that and Guy's response was very helpful. However, now I'm finding that
this simply doesn't do what that other page describes. After I set it to
Multiply mode, nothing happened. It's been a few hours since I set this up,
and just tried setting that mode now. I made sure I had clicked on the
selected region before setting the mode. What could I have done wrong?

The following shows a small excerpt of what I'm looking at. The yellow
portion has text below it.

[image: image.png]
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--
--

“Happiness is the meaning and the purpose of life, the whole aim and end of 
human existence.”

― Aristotle

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Re: [Gimp-user] How to highlight regions of an image

[David Karr via gimp-user-list]

On Wed, Sep 22, 2021 at 6:55 PM Liam R E Quin  wrote:

> On Wed, 2021-09-22 at 15:59 -0700, David Karr via gimp-user-list wrote:
> > .  For instance, after copying the foreground
> > color onto the selection, it talks about setting a "Multiply" layers
> > mode.
> > I don't see anything like that in the current interface.
>
> It's the 14th entry in the layer mode.
>
> Open the Layers dialogue:
> Windows/Dockable Dialogs/Layers
>
> At the very top of the dialogue is "ModeMormal"
> with a small  triangle probably, next to Normal.
>
> Click anywhere on that whole Mode  Normal control and you'll see a list
> of layer modes pop up, starting with Normal, Colour Erase, Dissolve,
> and so on, and some  way down is Multiply.
>

Ok, that and Guy's response was very helpful. However, now I'm finding that
this simply doesn't do what that other page describes. After I set it to
Multiply mode, nothing happened. It's been a few hours since I set this up,
and just tried setting that mode now. I made sure I had clicked on the
selected region before setting the mode. What could I have done wrong?

The following shows a small excerpt of what I'm looking at. The yellow
portion has text below it.

[image: image.png]
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Re: [Gimp-user] How to highlight regions of an image

[Liam R E Quin]

On Wed, 2021-09-22 at 15:59 -0700, David Karr via gimp-user-list wrote:
> .  For instance, after copying the foreground
> color onto the selection, it talks about setting a "Multiply" layers
> mode.
> I don't see anything like that in the current interface.

It's the 14th entry in the layer mode.

Open the Layers dialogue:
Windows/Dockable Dialogs/Layers

At the very top of the dialogue is "ModeMormal"
with a small  triangle probably, next to Normal.

Click anywhere on that whole Mode  Normal control and you'll see a list
of layer modes pop up, starting with Normal, Colour Erase, Dissolve,
and so on, and some  way down is Multiply.

Liam / demib0y / ankh / barefootliam

-- 
Liam Quin - https://www.fromoldbooks.org/

Full-time "slave" in voluntary servitude

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