24
votes
Accepted
Generate colorful streamline pattern (using FOSS)
This is for GIMP
Start with something like an A5 canvas size
Create a new brush like this
Create a new Paint Dynamic preset, and set the matrix as follows
Increase the size of the brush as you like,...
- 89.5k
14
votes
Generate colorful streamline pattern (using FOSS)
Here' my approach for Gimp:
Used an interesting photo with colours I liked
Source: Wikimedia - New York Times Square
Chose a region of interest from this photo
Increased saturation, contrast, and (...
- 12.6k
10
votes
Accepted
How can I draw seamless texture and have GIMP mirror the edges on texture sides?
In Gimp 2.10, you don't need to do this, you just use the Symmetry painting feature.
Create an image which is 3x3 the size of your intended tile (in theory, 2x2 is enough but the effect is easier to ...
- 17.8k
7
votes
Is it possible to revert preapplied alpha blend and find original color?
Yeah its possible i made a quick change to the code in this post and came up with following very sloppy python 2.X code:
from Tkinter import *
import struct
def ablend(a, fg, bg):
return ((1-a)*...
- 58.6k
4
votes
Accepted
How to draw the perpendiculars from the incentre in Inkscape?
Here's one method. There may be others of course.
Mark the origin of your incentre with guides.
Draw squares from the intersection of each triangle side and guide, to the centre origin (hint: Hold ...
- 89.5k
4
votes
Accepted
Gimp 2.10.12 not loading Python plugins
Make sure you have installed the gimp-python package, which has become "optional" in recent Ubuntu releases.
The message you see above is normal, the python code imports modules that are only ...
- 17.8k
4
votes
How can I draw seamless texture and have GIMP mirror the edges on texture sides?
I have discovered a way to do this exactly as I wanted. Steps:
Decide the size of your final texture, for example 1024x1024
Decide on a margin you want to have around it to be able to see the ...
- 1,004
3
votes
How can I draw seamless texture and have GIMP mirror the edges on texture sides?
There are a couple of ways you could make seamless patterns/tiles in GIMP.
The first is using Filters > Map > Tile Seamless. This may work better for some textures than others. Probably better ...
- 89.5k
3
votes
Accepted
Python library to expand type and offset paths like Illustrator
I think this is difficult in Python and I used Inkscape, which can expand font objects (called "object to path"), add stroke to paths, and allows running commands from the command-line. For example, ...
- 709
3
votes
How to get the coordinates for a selection bounding box in Gimp
A very basic python script that does it:
#!/usr/bin/env python
from gimpfu import *
def selectionMargins(image):
selection,x1,y1,x2,y2=pdb.gimp_selection_bounds(image)
if not selection:
...
- 17.8k
3
votes
How to get the coordinates for a selection bounding box in Gimp
This example image is 200px x 200px. If you don't know it, you can find the size by clicking Image > Canvas Size
The Crop Tool options show the X and Y position of the top left corner of the crop, ...
- 89.5k
3
votes
Accepted
Can't find new plug-in in GIMP
Missing plugin:
Navigate to your Gimp profile directory
open the pluginrc file with a text editor editor.
search for the plugin file in a line that starts with (plug-in-def
If the file is listed, ...
- 17.8k
2
votes
How to mask a layer from a channel in GIMP with Python?
The API doesn't seem to support creating a mask directly from a random channel. But you can create a mask from the selection, so:
Copy your channel into the selection
pdb.gimp_image_select_item(...
- 17.8k
2
votes
Accepted
python single line for loops
def drange(start, stop, step):
"""floating range
code by gimel see:
http://stackoverflow.com/questions/477486/
"""
r = start
while r < stop:
yield r
r += ...
- 58.6k
2
votes
GIMP: A code to edit a whole folder of images
glob is module that contains a glob function, so that shouldn't be glob(source_folder + "/*.JPG") but glob.glob(source_folder + "/*.JPG")
Also, if you give a path as part of the pattern to glob....
- 17.8k
2
votes
Python library to expand type and offset paths like Illustrator
I found this beautiful node library: outline-stroke/outline-stroke-cli
It was possible to convert it into a standalone packages, as described here. Download of the linux binary is also there.
How to ...
- 123
1
vote
Accepted
svg : what does "use xlink:href" mean in Inkscape?
Use-elements are a way of placing multiple copies of an object without having to duplicate the definition or a whole node-tree. Elements can be referenced by id with the xlink:href attribute.
Inside ...
- 3,826
1
vote
Customizing CMYK Halftone Screens in PDF Files
There is a reason why halftoning is usually controlled more downstream by the RIP software: the halftoning is optimized for the exact resolution of the imaging device and the printing process. It also ...
- 875
1
vote
Accepted
How to access image histogram values in python-fu?
You can use the gimp_drawable_histogram while iterating a window, for instance:
hist=[pdb.gimp_drawable_histogram(drawable,HISTOGRAM_VALUE,x/255.,(x+1)/255.) for x in range(255)]
On an 8Mpix image it ...
- 17.8k
1
vote
Accepted
Gimp Python-Fu how to copy a channel
Your third argument should be None:
pdb.gimp_image_insert_channel(i, c, None,0)
The doc is mostly written with the script-fu point if view, where items are just integer ids, and "no item" is ...
- 17.8k
1
vote
Accepted
Adding text layer with white background to image by using gimp python-fu
Several ways:
Plain bucket fill
The simpler is to bucket-fill the text layer in behind mode:
pdb.gimp_selection_all(image)
pdb.gimp_edit_bucket_fill(textlayer, BUCKET_FILL_FG, LAYER_MODE_BEHIND, ...
- 17.8k
1
vote
Adding text layer with white background to image by using gimp python-fu
I can tell you a simple way to do it in GIMP, without scripting it. So, that may help you to script it.
Create a text layer
Discard the Text Information (this rasterizes the text)
Remove the alpha ...
- 89.5k
1
vote
Is there a way to auto-generate (parametric) vector graphics to use in Inkscape/Illustrator?
Yes offcourse. Encapsulated postScript (EPS), Scalable Vector Graphics (SVG), Portable Document Format (PDF) and Drawing Exchange Format (DXF) are all just relatively simple text files. They are all ...
- 58.6k
1
vote
Accepted
Gimp: How to create a selection from file in Python
The simplest way is to load your mask as a new layer, do a color selection from it, and then remove it. So assuming that image is your current image:
import gimpcolor
# load mask as layer
mask=pdb....
- 17.8k
1
vote
Python library to expand type and offset paths like Illustrator
For offsetting paths (and some other graphics/geometry opperations), you could use the Shapely library:
https://shapely.readthedocs.io/en/stable/manual.html#constructive-methods
Its' main focus is GIS ...
- 601
1
vote
Why does an almost solid line appear in this image?
Banding effects like this can occur when the image viewer tries to compensate for differences in gamut between two color spaces or color profiles.
- 2,119
1
vote
Export multi page pdf with gimp
I fixed this very easily by adding the absolute path to the convert executable inside the script. On my machine it is:
/opt/local/bin/convert
This function becomes:
def combine_images_into_pdf(...
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