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| Dynamics |
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Posted by: Ofnuts - 03-03-2024, 04:34 PM - Forum: Tutorials and tips
- Replies (1)
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Dynamics are a way to change some brush charactertistic(s) in the fly using more hints than just the pointer position. The hints are:
- Pressure: the pressure on the stylus (this requires an adequately configured tablet)
- Velocity: how fast the pointer moves
- Direction: where the pointer goes
- Tilt: inclination of the stylus, on advanced tablets
- Wheel/rotation: I don't know what that is but I assume this is also for advanced tablets
- Random: not a physical input, just a random value between 0 and 100%
- Fade: the distance since the beginning of the stroke, as a percent of the Fade length configured in the paint tool (this repeats)
In practice with a mouse the only usable ones are Direction, Random, and Fade (and Velocity if you are really skilled).
These hints can be applied to the following characteristics:
- Opacity: from 0 to 100% of configured opacity
- Size: from 0 to 100% of the configured brush size
- Angle: from 0° to 360°: warning: the median setting is 180°, which is an upside-down brush, so for some mapping it is useful to use an upside-down brush.
- Color: a color is sampled from the active gradient
- Hardness
- Force
- Aspect ratio: from "0" (circular brush) to whatever is configured for the brush
- Spacing: from 200% spacing to the configured spacing
- Rate
- Flow
- Jitter
You define all this by editing/creating a Dynamics (as with other Gimp resources, you cannot edit the standard one, you have to make a copy first).
The first thing to do in a Dynamic is to define the mapping matrix. To control a given characteristic using a given hint, you just check the box that is at the intersection of the "hint" and the "characteristic". The example below associates Size with Random (so the size is random), and the Color with Fade (so the color is taken from a gradient as the pointer advances). A hint can apply to several characteristics (so you could have random size and color) and a characteristic can depend on several hints (but good luck predicting how this behaves).
You can define more finely how the hint is applied to change the characteristic by changing the mapping curve:
For instance, in the image above, the red-green part of the gradient is mapped to smaller part of the input range than the green-blue part, while the blue-red is not mapped at all, so the output favors mostly the green-blue part.
Gimp comes if a collection of pre-set dynamics, a very useful one is Track direction, where the brush angle is rotated according to the stroke direction, so the brush keeps the same orientation relative to the stroke instead of remaining upright all along.
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| Dynamics |
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Posted by: sallyanne - 03-03-2024, 08:41 AM - Forum: General questions
- Replies (10)
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Something I hardly use when using a brush or anything else. Because I have no idea about it. Just track direction and dynamics off.
I have never seen a Tutorial on them except the one Pix made at GC recently. But have no idea how to create new ones - and/or use them.
I may use them more or may not if someone could come up with a tutorial on them - maybe explain them etc. please.
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| simulate debug breakpoints |
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Posted by: gimpygirl - 03-03-2024, 01:56 AM - Forum: Extending the GIMP
- Replies (5)
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Hi
Since it's not possible to debug a plugin on windows (maybe it can on linux?) I want to make a way to 'pause' execution of a plugin. Why I want to do that? I want to check in gimp if some code was executed correctly.
For example: I add an alpha channel to a layer in the code, and I then want to 'pause' and check in gimp if it's added by right clicking the layer. And then continue my code.
Is there a way I can pause the code by showing a message box (after the code line I want it to stop) or something that needs to be closed before the code continues? Or another way? Keyboard input is not possible I think?
Please note I'm making a plugin WITHOUT GUI.
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Python Plug-in that Changes SubLayers Visibility and Export Images as PNG Files |
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Posted by: TiredGuy - 03-01-2024, 10:24 PM - Forum: Scripting questions
- Replies (2)
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Hello everybody!
I’m not very good not in GIMP, nor in Python, nor English, so please excuse me for my mistakes)
I have a .xcf file with a lot of layers and sublayers, for example:
(visible) Layer_1
(visible) Sublayer_1.1
(invisible) Sublayer_1.2
(visible) Layer_2
(invisible) Sublayer_2.1
(invisible) Sublayer_2.2
(invisible) Sublayer_2.3
(visible) Layer_3
I need to change the visibility of each sublayer in a selected layer in turn and export the entire image with all visible layers.
For example:
(visible) Layer_1
(visible) Sublayer_1.1
(invisible) Sublayer_1.2
(visible) Layer_2
(visible) Sublayer_2.1
(invisible) Sublayer_2.2
(invisible) Sublayer_2.3
(visible) Layer_3
Export image_2.1.png
then
(visible) Layer_1
(visible) Sublayer_1.1
(invisible) Sublayer_1.2
(visible) Layer_2
(invisible) Sublayer_2.1
(visible) Sublayer_2.2
(invisible) Sublayer_2.3
(visible) Layer_3
Export image_2.2.png
then
(visible) Layer_1
(visible) Sublayer_1.1
(invisible) Sublayer_1.2
(visible) Layer_2
(invisible) Sublayer_2.1
(invisible) Sublayer_2.2
(visible) Sublayer_2.3
(visible) Layer_3
Export image_2.3.png
The best that I did with the help of ChatGPT is this plug-in in Python:
Code:
#!/usr/bin/env python
from gimpfu import *
def export_sublayers(image, drawable, layer_name, path, prefix):
# Find the target layer
target_layer = None
for layer in image.layers:
if layer.name == layer_name:
target_layer = layer
break
# If the target layer is found
if target_layer:
# Iterate through sublayers
for sublayer in target_layer.children:
# Make the current sublayer visible and others invisible
for child in target_layer.children:
pdb.gimp_item_set_visible(child, child == sublayer)
# Export the image
path = path + "\\" if not path.endswith("\\") else path
filename = path + prefix + "_" + sublayer.name + ".png"
pdb.file_png_save_defaults(image, image.active_layer, filename, filename)
# Make all sublayers visible again
for sublayer in target_layer.children:
pdb.gimp_item_set_visible(sublayer, True)
register(
"python_fu_combine_layers_and_export",
"Combine layers and export",
"Combine layers and export",
"Your Name",
"Your Name",
"2024",
"<Image>/File/Combine layers and export",
"*",
[
(PF_STRING, "layer_name", "Layer name", ""),
(PF_DIRNAME, "path", "Export path", "/path/to/export/"),
(PF_STRING, "prefix", "Prefix", "")
],
[],
export_sublayers)
main()
But this plug-in exports only sublayers in a selected layer and I can't make it export the entire image with all visible layers.
Is anybody able to help me with it, please?
Or maybe are there other ways to do it?
Many thanks for any help!
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) in other posts: I have extracted a font sprite but it's not a perfect square.
