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| Basic Tutorial Example |
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Posted by: elindarie - 10-05-2025, 01:02 AM - Forum: Extending the GIMP
- Replies (3)
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I don't know if this will help any other beginners on Gimp 3 Python scripting.
Taking most of a day, I made a simple example that works, to my amazement. I have Gimp 3.0.4 on Ubuntu 22.04, and this runs in GIMP from Filters -> Development -> Python-Fu -> Python Console.
It draws a red box on a blue background.
Code:
import gi
gi.require_version('Gimp', '3.0')
from gi.repository import Gimp
Gimp.context_set_foreground(Gegl.Color.new("red"))
Gimp.context_set_background(Gegl.Color.new("blue"))
image = Gimp.Image.new(300, 400, Gimp.ImageBaseType.RGB)
layer = Gimp.Layer.new(image, "layer 1", 300, 400, Gimp.ImageType.RGBA_IMAGE, 100, Gimp.LayerMode.NORMAL)
image.insert_layer(layer, None, 0)
layer.edit_fill(Gimp.FillType.BACKGROUND)
Gimp.Display.new(image)
Gimp.Image.select_rectangle(image, Gimp.ChannelOps.REPLACE, 60.0, 80.0, 100.0, 150.0)
layer.edit_fill(Gimp.FillType.FOREGROUND)
Gimp.Selection.none(image)
Gimp.displays_flush()
I learned that you can also set colors in this format:
Code:
Gimp.context_set_foreground(Gegl.Color.new("#B00000"))
I found the documentation terribly sparse. For example, in https://developer.gimp.org/api/3.0/libgimp,
at https://developer.gimp.org/api/3.0/libgi...angle.html, which contains:
Code:
gboolean
gimp_image_select_rectangle (
GimpImage* image,
GimpChannelOps operation,
gdouble x,
gdouble y,
gdouble width,
gdouble height
)
My script has the line:
Code:
Gimp.Image.select_rectangle(image, Gimp.ChannelOps.REPLACE, 60.0, 80.0, 100.0, 150.0)
How I got from "gimp_image_select_rectangle" to "Gimp.Image.select_rectangle" wasn't clear, and when I looked up the constants for Gimp.ChannelOps.REPLACE,
at https://developer.gimp.org/api/3.0/libgi...elOps.html
it shows GIMP_CHANNEL_OP_REPLACE
from which it wasn't clear to me that this could be Gimp.ChannelOps.REPLACE.
I would be happy to help improve the documentation, which I found sparse and confusing.
I would be grateful if anyone could tell me how to change the dark blue font in the GIMP python console (without changing the Dark Colors scheme), because I couldn't read it at all unless I highlighted it so it showed as reverse video. I couldn't figure out where, maybe in what css file, this is defined. I'm using gnome and X11.
To do this, it was a lot of hit and miss, and searching for other people's scripts and trying to find similar code in theirs. Also, I don't really understand how to convert from pdb to non-pdb function calls and back.
I guess my next step is to convert this to a plug-in (.py) file.
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| Gimp x Photoshop |
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Posted by: Dunham - 10-03-2025, 10:10 PM - Forum: Watercooler
- Replies (5)
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Good evening
I'm very new to the forum. I used to use Photoshop, and about two months ago I decided to leave Windows and migrate to Linux, and consequently to GIMP. I use GIMP 3.0.4 and I've really enjoyed it, and I've been learning by watching several videos on YouTube. While I'm at it, I'd like to know from more experienced people if GIMP can truly replace Photoshop without any problems. That is, excluding generative AI, does GIMP have the same or most of the features as Photoshop? Is the quality of the artwork on par with Photoshop's?
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| Gimp 3.0.4 doesn't have the old fonts |
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Posted by: GMP - 10-02-2025, 03:32 PM - Forum: General questions
- Replies (10)
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Gimp 3.0.4 doesn't have the old fonts from a project I did 3 years ago. I want to use the same font DejaVu Sans oblique on my new project. After not being ab;e to use the old font in my new project, I loaded the old project and with the Text tool I selected the text with the font. I then changed the font with the text window on the right. I even changed back to the correct font and it's showing the wrong font.
Here are the snips for the wrong font and the correct font
https://onedrive.live.com/?id=%2Fpersona...IMP&view=0
I see that I still have Gimp 2.10 and I opened the old project and it's not correct either. So somehow the Fonts path must not be accurate. It's affecting both versions
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| changed behavior CNTL-X and CNTL-V, moving sections |
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Posted by: Hupa - 10-02-2025, 08:13 AM - Forum: General questions
- Replies (1)
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Hi all,
I discovered changed behavior since I use version 3.
I am maintaining scores for our choir and for that I sometimes need to amend, fix scores. Sometimes that involves changing, or better, moving texts on the score.
For that I loaded the "original" in GIMP, select the portion that needs to move, cut (CTRL-X) it and that paste it (CTRL-V), after which I could move the paste portion around using my arrow keys. One of the use cases is also removing excessive white space.
In version 3 I can do the same CTRL-X and CTRL-V, but then nothing happens when I use the arrow keys. It appears like it has lost the connection to the selected area in the canvas.
I suppose something has changed in the behavior in version 3. I looked up for changes, and see entries on Internet about CTRL-C and CTRL-V, but they do not seem applicable to my use case.
Thanks in advance
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| Threshold Alpha totally doesn't work in 2.10 but works fine in 2.08 |
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Posted by: jupiter - 10-01-2025, 08:33 PM - Forum: General questions
- Replies (3)
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I just spent a whole day trying a dozen different methods that are supposed to make all the transparent *colored* pixels in an image completely opaque while keeping the completely transparent pixels as they are. However in 2.10 whenever I set Threshold Alpha to zero as often suggested it has no effect and GIMP simply resets it to 0.5. Then I tried this in 2.08 and it worked fine right away.
Does that mean it's just plain broken in 2.10? Or is there an obscure deeply buried setting that somehow got changed in 2.10 that I'm not aware of and is blocking changes to the threshold? The Alpha channel is definitely not locked.
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| Duotone in GIMP |
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Posted by: kmll - 10-01-2025, 04:58 PM - Forum: General questions
- Replies (4)
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Hi
I have been using a duotone effect in Photofiltre on a student project. However that software is now too old to be installed and I am considering GIMP. Do anyone know if a duotone effect similar to the attachment is possible in GIMP, and if yes how?
As you can see the effect makes the image duotone and at the same time make the quality "reduced", more grainy.
Please see Link to image
(https://ibb.co/jk2ysW3G)
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| Learning GIMP after 30 years with Photoshop |
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Posted by: Rosseliani - 10-01-2025, 04:34 PM - Forum: General questions
- Replies (4)
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Hello everybody,
I recently decided to cancel my expensive Adobe Photoshop account.
Now I am learning to use the GIMP and I often encounter difficulties.
I already found that some Gimp features are better than Photoshop features.
My question is: Is there on the Gimp-Forum.net a thread about migratong from expensive Photoshop to free GIMP?
Thanks for answers!
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