How to get a pixel value from an image file?
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Is there a relatively simple way to do this? It does not seem possible with the SketchUp API or with the core Ruby methods. I suppose there are many methods using external DLLs but I am looking for something as easy as possible. I think it might be possible by using a WebDialog in combination with the HTML5 <canvas> element and some javascript, but I don't think the <canvas> element will work on Windows systems using a Webdialog.
What I am after is getting the RGB values of a texture for a given pair of UV coordinates.
Thanks.
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I'm interested in this too. The only script I can think of right now is one that Didier Bur made to make displacement from a greyscale map. Maybe you can find something there?
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@whaat said:
Is there a relatively simple way to do this? It does not seem possible with the SketchUp API or with the core Ruby methods. I suppose there are many methods using external DLLs but I am looking for something as easy as possible. I think it might be possible by using a WebDialog in combination with the HTML5 <canvas> element and some javascript, but I don't think the <canvas> element will work on Windows systems using a Webdialog.
What I am after is getting the RGB values of a texture for a given pair of UV coordinates.
Thanks.
Or maybe you can find some ruby libraries that allows you to read directly from the files.
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@thomthom said:
Or maybe you can find some ruby libraries that allows you to read directly from the files.
I've looked around a bit. You would think there would be one but I think everyone Ruby library I have found is just a bridge to another library that was done in C++. (Maybe that's the only way it can be done...)Are you there Didier? I am sure you have some ideas.
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@pixero said:
I'm interested in this too. The only script I can think of right now is one that Didier Bur made to make displacement from a greyscale map. Maybe you can find something there?
Do you have the link?
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I think it's the heightfield generator: http://www.crai.archi.fr/RubyLibraryDepot/Ruby/em_fil_page.htm
Scrambled plugins. But they don't read normal formats. Takes PGM or PPm formats: http://en.wikipedia.org/wiki/Netpbm_format
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@whaat said:
@thomthom said:
You would think there would be one but I think everyone Ruby library I have found is just a bridge to another library that was done in C++. (Maybe that's the only way it can be done...)
Odd that there's be no proper ruby library. One, time-consuming way, would be to implement it yourself from the specifications. BMP, PNG, GIF and JPEG specs are available for anyone, I think TIFF is as well. But it's work, at least with the compressed formats. BMPs are pretty straight forwards though.
I was looking into these formats when I was working on a PHP thumbnail extractor. -
You had a look at this one? http://pikl.rubyforge.org/
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Yet another bridge to a C++ library... (sigh)
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