Computer Science Canada Converting rgb to... um, rgb? |
| Author: | Lapsus Antepedis [ Sat Jul 23, 2005 9:19 pm ] |
| Post subject: | Converting rgb to... um, rgb? |
I need help on how to convert 'normal' RGB colour values(0-255) to colour values that can be interpreted by languages like python (as percentages, from 0-1 as a real number). This way I can use web-based colour pickers, and photoshop to find colours for things, and then actually be able to use them in programs... Did that make any sense? I can't tell if it did or not...  |
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| Author: | Mazer [ Sat Jul 23, 2005 10:01 pm ] | ||
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A bit confusing, if you're not thinking about what I think you're thinking. (hah, get it?) If you have an colour with RGB values ranging from 0 to 255, and you want it as a percentage, why not just divide? Eg. You have colour red defined as (255, 0, 0). And you want that to be (1.0, 0.0, 0.0). Which is really just a matter of (255/255.0, 0/255.0, 0/255.0) What did you mean by having a language like Python interpret the colour values? I'll admit I haven't gotten as far as I should've in Dive into Python, but I'm pretty sure there isn't much (if anything) about colour. Which leads me to assume you meant pyOpenGL. And in that case, though I have yet to test it, you can still use the RGB values in the 0 to 255 range. Eg.
Should set the colour to white. I hope that was helpful to you. |
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| Author: | Lapsus Antepedis [ Sun Jul 24, 2005 2:06 am ] |
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Coutsos wrote: If you have an colour with RGB values ranging from 0 to 255, and you want it as a percentage, why not just divide? Eg. You have colour red defined as (255, 0, 0). And you want that to be (1.0, 0.0, 0.0). Which is really just a matter of (255/255.0, 0/255.0, 0/255.0) Ah, I knew that I was forgetting something simple, I didn't have the ".0" on the end. That should make a big difference. Coutsos wrote: What did you mean by having a language like Python interpret the colour values? I'll admit I haven't gotten as far as I should've in Dive into Python, but I'm pretty sure there isn't much (if anything) about colour. Which leads me to assume you meant pyOpenGL. Actually, I am using the visual module, it just seems easier to me somehow. I was using python as an example because that's what I was using at that moment. Another example that comes to mind is the Stepmania metrics files, but I doubt many people would recognise that anyway, and it's changing completely soon, so that example would have just confused people... Coutsos wrote: I hope that was helpful to you. Very helpful! Thank you! |
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