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  Bulk convert
Posted by: Joseph_N - 12-06-2021, 06:43 PM - Forum: General questions - Replies (7)

GIMP can convert formats, e.g., from HEIC to JPEG, and it can perform bulk operations from the command line using the -b switch, but I have found no listing of all possible CLI commands or of the specific command or syntax to convert the file format. How would I go about converting a directory's set of HEIC files to JPEG files from the CLI?

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  Problem with correct colours in python script
Posted by: david - 12-06-2021, 04:16 PM - Forum: Scripting questions - Replies (12)

I have created a small script which fills a transparent layer with a colour. If I carry out the procedure manually I get the correct colour, but when I do it in Python the colour is incorrect. The example detailed below the colour is D37518 Hex - 211, 117, 24 Decimal.


The relevant piece of the code is:

   Tone = pdb.gimp_layer_new(image, width, height, type, "Tone", opacity, mode)            #new empty layer
    image.add_layer(Tone, 0)
    
    if colour == 0:
    
        sepia = gimpcolor.RGB(211,66,20)
        pdb.gimp_context_set_foreground(sepia)

    pdb.gimp_drawable_edit_fill(Tone, FILL_FOREGROUND)

If I run the code then check the inserted colour with the eyedropper I get the result in the screenshot.

No doubt something silly I am doing!



Attached Files Image(s)
   
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  How do I customize the toolbox?
Posted by: Marscaleb - 12-06-2021, 03:25 AM - Forum: General questions - Replies (2)

How do I customize the toolbox in GIMP these days?  I recall doing this in older versions but can't find the options I need now.

I want to change what tools appear in the toolbox.
More to the point I want to disable this counter-productive layout where the tools have other tools hidden inside them.  I just want to put the tools I use frequently in the toolbox so I can get them with a single click.
But as I said, I can't find the option to customize it in any place I'm looking in.

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  intelligent fill
Posted by: bbxrider - 12-06-2021, 02:08 AM - Forum: General questions - Replies (1)

see attached, the curved text along a path has voids,
there seems to be no way to stop those voids 
I would like to fill the voids with an intelligent fill,
where the tool would build an outline around the text
and fill in the voids while staying inside the outline, so all
the edges would be smooth along the text contour lines.

I've tried just painting with a small brush, etc., but there's
always jagged strays. the resynthesizer plugin tool looks like a
possibility or some version of a heal tool



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  remove print pattern
Posted by: Tawe19 - 12-05-2021, 05:25 PM - Forum: General questions - Replies (8)

this is a scan from an old photo.
   
the original photo had this pattern of dots throughout, i'm guessing that this was a 'feature' at the time.

does anybody know how I might reduce or eliminate the effect ?

many thanks

Tawe

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  Replicating a path
Posted by: Ottia Tuota - 12-05-2021, 09:32 AM - Forum: Extending the GIMP - Replies (59)

Here is an experimental plugin. It is still at a preliminary stage and produces sometimes bad results. But I decided to publish it now since I think it may be useful as it is. And I am interested to hear any suggestions.

The plugin takes a path and replicates it along a circle:

   

So far the plugin works well for straight-edge paths (with some limitations) but you can try it with curved paths too.

With the plugin you can easily make the circular figures (but now as paths) in the following old thread:

https://www.gimp-forum.net/Thread-How-to...le-meander?

You can download the plugin from

http://kmarkku.arkku.net/Path_replicate_...aster.html

Unzip the .zip file and place the one file it contains (replicate_path_along_circle.py) in your user's plug-ins folder. Then (re)start Gimp. Make a new image, and there a Pattern path like above. In Gimp's menu, go to the Paths dock, right-click the pattern path, and follow the links

Tools > Replicate > Replicate path along circle

and click. That opens the GUI of the plugin. I explain now the inputs.

Paths

In addition to the "Pattern path" (the path to be replicated) the plugin asks for a "Base path". It is a path with a single stroke. The stroke must be open so that it has two ends. Those end points are used as reference points: they are mapped precisely onto the circle. Example:

   

The Pattern is the blue arrow. Below it the red 2-anchor line is the "Base". You can imagine that the Base and the Pattern are transformed together: the end points of the Base are mapped onto the circle and the Pattern follows along. The result, using default values, is on the right. (The transformed Base is not shown here but the plugin does allow it to be drawn too. The same goes for the circle.)

Replication

To control the replication process there is a list of parameters:

  • Circle center x
  • Circle center y
  • Circle radius
  • Sector start
  • Sector angle
  • Number of copies
  • Radial scaling
The first three determine the circle and the next two its sector. In the above pictures only the whole circle was used, but you can also restrict the replication to the sector. For instance, with Sector start = 0 and Sector angle = 90 you can get:

   

The meaning of "Number of copies" and "Radial scaling" should be obvious. The latter does not change the circle but it scales the transformed pattern radially.

Distortion method

The plugin distorts the pattern to accommodate to the circular arc. There are three choices for how the distortion is done. The most natural is the default "polar coordinates" and probably that is all you will need. You can try the "exponential" method. It has the advantage to be conformal when radial scaling is 1, and that property may be useful sometimes (and for a mathematician this is the most natural choice!). The third choice is "no distortion" which causes the pattern to be copied as such (if radial scaling is 1).

If you use distortion you are safest when you apply the plugin only to straight-edge paths. Curved paths may cause unpleasant surprises; see below. If you choose "no distortion", however, curved paths should cause no problems.

Other drawings

With the last two inputs
  • Apply to the base path too?
  • Draw the circle?
you can make the plugin (1) to transform and draw the Base path too; (2) to draw the target circle.

Above I talked about the Base path as if it were only a 2-anchor path and nothing else. But all that is required of it is that it has a single stroke and that the stroke has two ends. Those end points are used as reference points. But between the end points the stroke may be anything, and sometimes you can use it as a part of the drawing; for that reason there is the option to draw the transformed Base. Or maybe you just want to see where the reference points are mapped to.

Known limitations

The current plugin may give bad results in distortions at least if:
  • The path has strongly bending or very long arcs, or inflection points. The remedy is to add anchors at strategic points.
  • The path is much wider than the base. Sometimes this is disastrous but not always - see the last picture below.
  • The ratio (Sector angle)/(Number of copies) is large. The plugin allows 120 degrees at most, and occasionally even that is a little too much.
I hope to make improvements in some later version.

Joining strokes

Look at the first picture. The resulting path consists of 12 sectors, and each sector is made of 4 short strokes, three open and one closed. But clearly the open short strokes could be joined to longer strokes, going round the whole figure. The plugin does not do this. But if you want to do the joinings, my plugin in

https://www.gimp-forum.net/Thread-Joinin...-of-a-path

seems to work well with its default values. And so does Ofnuts' plugin Edit > Join strokes contained in ofn-path-edits. In the first picture I created the pattern path by means of a grid and "snap to grid". That way the strokes were easily joined in the result.

Finally, a little playing. The Base is the red line in the middle, precisely half of the width of the grid:

   

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  only transparency on extended canvas
Posted by: Gimpr - 12-04-2021, 10:22 PM - Forum: General questions - Replies (3)

hi guys,
I'm adding a canvas extension to the bottom of  a group of images. I want the extension to be black so I can add white text to the extended canvas. I set my background color to black, extend the bottom of the canvas after adjusting the offset (resize layers set to NONE). I've done this many times before and the extended canvas strip is black, but today I have only been able to fill with transparency, no other Fill Canvas option works.
I'm running 2.10.4 on Windows 10 (if that matters) and have made no changes to my Gimp installation since the last time I used this "title bar" operation on other images... any suggestions?
Thanks in advance!

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  ofn-export-layers-combinations
Posted by: Ofnuts - 12-04-2021, 02:36 PM - Forum: Extending the GIMP - Replies (1)

A quickie to generate all possible combinations of designated layers:

For instance with a layer structure like this:

   

It creates this:

   

Available at the usual place.

Please report any mishaps. Suggestions from improvements welcome.

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  Making tiny images for a RC transmitter.
Posted by: Sweetfrost - 12-03-2021, 07:43 PM - Forum: General questions - Replies (2)

Hi there.

First of all - i am totally new to GIMP so any help would be greatly appreciated and i need it bent i neon ... like really understandable for a GIMP-beginner. I use GIMP version 2.10.28 on Windows 11.

Here is a description of what i need to do. I have a transmitter with a color display and i can put an image of the planes i'm using on it. The image has to be 192 x 108 pixels. I have attached a screenshot of the display of the transmitter so you can see what i am talking about.

   
   


My problem is that i can't figure out how to take the image of my plane/helicopter and make it fit the 192 x 108 pixels without too much of the rest of the image - i need the plane to occupy as much of the box of 192 x 108 pixels a possible without too much of everything else around the plane.

I have used other software where i made a mask (192 x 108 pixels) and then just resized the image (keeping the aspect ratio) until the plane fitted in the mask and then use the option "cut to mask" so only the little rectangle with the plane was left and i saved it as PNG. Since i can't afford to buy the software i found GIMP and hope i can learn to do similar things with my pictures. 

I hope someone in here could find the time to explain this to me - and down on a level that i can understand.    Big Grin

Best regards

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  G'mic problems?
Posted by: rickk - 12-03-2021, 05:54 PM - Forum: Other graphics software - Replies (9)

I've read in several other threads people make casual reference to experiencing problems with Gmic, and as someone who just started using it, I'm curious what "well known" problems people are experiencing? (so that if I notice the same problem, I won't suspect the cause is due to a problem specific to my installation).

One thing I've had  issues with is that about  every third or fourth time I use it, closing Gmic will freeze Gimp up tight, none of the menu items is accessible, and the only path forward is to force Gimp to end, without opportunity to save the work. Highly frustrating.
This is even after having the notorious "internet" box unchecked. And happens on machines where Gmic is the only  addition to Gimp, as well as machines that have beaucoup add ons.

Interestingly enough, I do not experience this problem using Gmic inside Krita, so I'm not at a hair pulling standstill, I'm just trying to understand what's going on between Gimp and Gimc.

Is this in any way similar to the problems others are experiencing?

One other oddity that I noticed last night.  using the "gradient from line" function in Gmic under Krita... when I told Gmic to save the resulting .ggr file, the end result WAS NOT saved in  /home/yourname/.local/share/krita/gradients/ as one might suspect to be the default location.  The file was in fact saved to  /home/yourname/.config/GIMP/2.10/gradients/

And I just found this unusual for the default "as installed" original configuration working inside Krita.

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