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Adding and editing an image

karlkanekarlkane
in KLayout Support

Hi guys,
A quick thank you to all who chipped in on previous issue. Got it sorted in the end with inputs from a number of people.
My next issue may be a simple one or not, but have tried to find solution with no luck.
I am trying to add an image and then edit it. What I want to do is slice the image into a number of strips, and separate the image strips a specified distance away from each other. The idea is to create a comb effect, and to be clear, I am not wanting to delete any part of the image, just to separate it into strips that if recombined, would make up the original image.
Any and all help is appreciated,
Karl

Comments

  • dick_freebirddick_freebird
    In the distant past I used a "gf2gds" program to get the image into layout tool. Which is probably not the proper name, but ....

    Import, put on appropriate layer etc.


    Then I'd use the Edit>Subtract others from first after overlaying "cutter" stripes where you want stuff gone.
  • MatthiasMatthias
    edited September 2022

    Cool solution :)

    I could not find a gf2gds program on the net.

    But here is a small piece of code turning an image into a layout:

    # Prepare a layout
ly = pya.Layout()
l1 = ly.layer(1, 0)
top = ly.create_cell("TOP")

# Load the image and convert to RGB32 for easy decoding
img = pya.QImage("/home/matthias/Pictures/avatar.png")
img = img.convertToFormat(pya.QImage.Format_RGB32)

p = 1.0  # pixel size in micron

# Scan the image and create a box for each "bright" pixel
for x in range(0, img.width()):
  for y in range(0, img.height()):
    px = p * x
    py = p * (img.height() - 1 - y)
    # green pixel value determines if bit is set or not
    green = (img.pixel(x, y) >> 8) & 0xff
    if green >=128:
      top.shapes(l1).insert(pya.DBox(px, py, px + p, py + p))

# Display the layout    
mw = pya.MainWindow.instance()
vw = mw.view(mw.create_view())
vw.show_layout(ly, True)

    Matthias

  • karlkanekarlkane

    Hi guys,
    Thanks for your help. I have used that gf2gds method and although it imports and you can make some changes, I cant seem to separate the image into strips, only delete the strips which I don't want to do. The image need to cut into strips and expanded out wards.
    Again, any help etc etc
    Karl

  • sekigawasekigawa

    Do these images look like what you want?



  • karlkanekarlkane

    Yes!! Exactly!

  • sekigawasekigawa

    OK. Then, the attached solution of mine will help.
    But you need to modify the lines shown below to reflect your environment.

    Good luck!
    Kazzz-S

  • karlkanekarlkane

    OK, thats sounds good. But you have to remember I am very much a novice at this. Do i save these files in the Klayout folder as a GDS file?
    Regards
    Karl

  • sekigawasekigawa
    edited September 2022

    Location of the three files

    1. KazzzS-KL2158A.py
      A brief usage is given in the script, as shown below.

      If you are using KLayout on Window, the right place would be:
      C:\Users\YOUR_USER_NAME\KLayout\pymacros\

    2. avatar.png
      Any place. However, you need to set the full path to the image file in line 128 like:
      imgSrc = "C:/MyWork/avatar.png"

    3. KazzzS-KL2158A.lyp
      Any place.

    Step-by-step operations (Images captured on macOS)





    Saving the layout
    This script does not generate any output file in GDS2 or other formats.
    You can manually do so.
    Or you can add some more code to save the layout automatically. ===> Reference

    Kazzz-S

  • karlkanekarlkane

    Well that seems to have worked a treat as they say. I do have one question though. Is it possible to keep the image in its original colour? It has broken the image into three layers, each layer a whatever colour you choose, but I was hoping to keep the image as it was - in full colour.

  • sekigawasekigawa
    edited September 2022

    Well that seems to have worked a treat as they say. I do have one question though. Is it possible to keep the image in its original colour? It has broken the image into three layers, each layer a whatever colour you choose, but I was hoping to keep the image as it was - in full colour.

    Since I do not fully understand the problem you are trying to solve, I cannot imagine the usefulness of keeping the original colors in a layout.
    However, one idea is to store pixels (converted to Box shapes) having the same color in a particular layer.

    A drawback is that the number of layers can quickly become large if an input image contains many distinct colors. For example, in the case of avatar.png, I've found 3117 different colors.
    Because of many such layers, the brute-force approach I have shown above takes time.
    More precisely, generating the outputs below took about 500 sec on my Mac.

    Please refer to the second PYA script for more details.

    Kazzz-S

    2022-09-29: updated the code

  • MatthiasMatthias

    Thanks for this nice discussion! :)

    I also wonder what sense it makes to keep the layer colors. After all maybe you actually need an image processing library?

    Matthias

  • karlkanekarlkane

    Hi everyone,
    I was away for a bit, so have started back at this. Just a quick question though. How do i switch of the function for blink?
    Probably something very silly no doubt!

  • sekigawasekigawa
    edited November 2022

    Select a layer, or multiple layers, then follow Layer Toolbox ---> Animation ---> Blink or /Blink (inverse timing). None to turn off.

    Kazzz-S

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