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  script-fu convert pdf to png WITHOUT antialiasing
Posted by: vrjansen77 - 12-08-2017, 02:45 PM - Forum: Extending the GIMP - Replies (2)

I am not familiar with script-fu and I really have the urgent need for a script that converts a PDF to a PNG without the anti-aliasing. (raw). I want to do this with the Gimp because of the perfect result but till this moment I am not able to write a script that does also set the anti-aliasing off. 

Please can somebody help me??? 

Thanks in advance!!!

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  How to Turn Raster Image into Black & White with Outlines?
Posted by: TechnicGeek - 12-08-2017, 09:29 AM - Forum: General questions - Replies (8)

Hello,

I want to learn how to turn raster image into black and white with outline like this raster:

   

Into styles like these, while giving preference to first figure because it is more detailed:

   

Must vectorization be as part of the entire process or it can be done without conversion to vector?

Thanks.

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  Replacing the color
Posted by: grit - 12-07-2017, 11:43 AM - Forum: General questions - Replies (1)

How to change the color so that all soft gradients of the color become new color and it's soft gradients ?

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  Brush Hardness
Posted by: korbie - 12-05-2017, 10:10 PM - Forum: General questions - Replies (9)

Hi guys,


I'm very new to all of this. The issue I'm having is trying to use brushes I have downloaded (in the .abr format), I have seemingly no issues copying the file to the brushed folder for gimp 2.8.22, and when I open Gimp it shows the brushes in the list.

However, when I try to actually use one of these new brushes they are always blurry and pixelated. When I look at the settings for the brush, every single one is always at "0" hardness. I am unable to change any setting other than size. 

I have tried multiple different brushes, I have completely uninstalled Gimp and deleted all files and folders associated with it and then reinstalled it. No matter what I do it's the same issue over and over.

I have increased the pixels per inch. Nothing seems to work.

I know it has to be something I'm doing incorrectl. I must just be missing something.

Please help!



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  Gimp, python, and numpy
Posted by: Ofnuts - 12-04-2017, 09:52 PM - Forum: Extending the GIMP - Replies (28)

Numpy is one of the things that makes Python an "in" language according to this StackOverflow blog. But it can also be used outside of data science. In practice it is a very efficient vector/matrix library and so is well suited to process image data.

Together with the ability to extract "pixel regions" with the Gimp python API, some pretty fast processing can be written quickly. See attached script for some exemples: median/average filter (the median filter is almost twice as fast as the one in GMIC), and an implementation of Color>Desaturate>Luminosity. If done properly, there are no loops in Python, all the pixel iteration is done by the numpy code on native data.

Of course, you have to add the numpy module to the python runtime used by Gimp. Very easily done in Linux... it could be more complicated to do on Windows/OSX, but not impossible.

Edit: updated the script 2017-12-05 (now uses 2D rectangular color planes instead of single vector ones)



Attached Files
.zip   numpyops.zip (Size: 1.23 KB / Downloads: 18)
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  Faster Way to Clean Background in Photo / Vector Image?
Posted by: TechnicGeek - 12-04-2017, 03:50 PM - Forum: General questions - Replies (12)

Hello,

Often I need to remove background from photo/raster or vector. I wanted to know what is the most efficient way to do that. Here's how I do it if it's photo:

1. Use Rectangle Select or Ellipse Select to select areas around object to remove first.
2. Use Eraser to remove small areas of background until all around object is clean.

Sometimes I would select Fuzzy tool to delete areas with same color but in photo/raster images it's hard to target.

In vector file, I would no need to remove background selection by selection because Fuzzy tool can select background which happens to be of same color and I can remove background. Depends on vector too of course because with manually converted photo to vector the background would still have variety of colors from conversion.

Here's my current image that was converted to vector. I am trying to find a faster way to remove background.
What would be your advice?

   

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  is it me or is it Gimp?
Posted by: Ofnuts - 12-04-2017, 03:36 PM - Forum: General questions - Replies (5)

In the attached XCF (small!: 5x5pixels), there are 4 layers: 1, 2, 3 and the problem layer, "Numpy Ops" (which is identical to "1", with one red and one blue square). For me, this layer:

  • Shows in the Layers list, but behave as a transparent layer in the Image window.
  • Remains invisible if I copy/paste it over itself (Ctrl-C,Ctrl-V,Ctrl-H)
  • Produces a visible copy if I copy it as a new layer (Ctrl-C,Ctrl-V,Ctrl-Shift-N)
  • Can be painted over, but the painting only shows in the Layers list
Is it the same for you?

The layer is produced using the "pixel region" API for Python...



Attached Files
.xcf   NumPy.xcf (Size: 1.59 KB / Downloads: 10)
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  Possible to replace foreground with background?
Posted by: gimper - 12-04-2017, 10:10 AM - Forum: General questions - Replies (2)

I'm new; this is my first message.

I'm new to GIMP, but I'm learning everyday.

My question is: 

Is it possible to cut out the foreground of an image and replace the cut out area with a continuation of the background in such a way that the new image looks flawless and continuous?

If the background is just one simple color, this would be easy.

Similarly, if the background is a simple repeating pattern, then this would also be easy.

But what if the background is not simple?

Here's a concrete example of what I mean:

Let's say I take a photo of my friend standing in front of a wooded area with trees and the sky in the background and the green grass at his feet and everything else you would expect to see at the woods.

I can easily cut out my friend's image from the photo.

But is it possible to fill in the empty space where my friend's image was with a continuation of the background in such a way that the resulting image looks as if my friend were never there to begin with?

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  Making a precise blurry border
Posted by: Espermaschine - 12-03-2017, 08:58 PM - Forum: General questions - Replies (3)

Finished my season's greetings image yesterday and the thing i surprisingly struggled the most with was getting the vignette/blurry outline right.

Lets say i want something like this:

   

and i want perfect control over every detail of my blurry border. I want a certain area to be opaque, the rest blurry and i want to perfectly control how far the blurry region reaches.
How would you do this ?

Shrinking and feathering doesnt give me very predictable results....

I tried to solve the problem by reversing the approach:
shrunk a selection, inverted, activated the quick mask then blurred and manipulated with the curves tool.
Its still not the perfect solution.

   






Stars on transparent background for examples.
   

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Photo Inspired by 70s scifi book covers.
Posted by: BlueHobbit - 12-03-2017, 04:04 PM - Forum: Gallery - Replies (8)

City Of Fire.. or Termites In Space.. either work really.

   

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