inconsistent sampling for population by palette size

[hwaynefair]

RgbQuant is awesome!

I am using it in an application for beginning artists (painters) - reducing an image to a minimal number of colors...etc.

The strange behavior I find is that when I get a palette size of 10 - orange (in this particular case) is one of the most predominant color - and green doesn't show in the top 10 colors.

But when I get a palette size of 15 - green (which is far more visually correct) is the predominant color (by population).

Can you give me any advice on this?

Thanks so much!

var q = new RgbQuant({ colors: getSlice });
q.sample(ctx);
var color = q.palette(true, true);

[leeoniya]

hey @hwaynefair ,

Can you link the original image here?

RgbQuant doesnt do great on very low color palette sizes (< 16). You can read a bit more in #12. I'm currently on vacation, but will take a look in about a week. In the mean time, try bumping up the minHueCols setting.

[hwaynefair]

Really appreciate your timely response (well - any response at all for that matter)!
I will do as you advised - and please find the original image attached.

FYI - my "objective" here is to "paint" the HTML canvas with around 10 colors that are not too close to one another in value - to serve as an "under-painting" on the "real" canvas on which the artist is painting....

Thanks again!
-wayne

[leeoniya]

i added this lily pond image to the demo page (i can remove it if this is a problem, btw) and i cannot get it to produce the results in your screenshot with a 10-color palette. can you test it out here and see if the results are still the same for you?

http://leeoniya.github.io/RgbQuant.js/demo/

thanks!

[hwaynefair]

Leon - you are so kind to go the extra mile with me on this. I apologize for my very late response.... I failed to notice the notification on github - and have been very distracted from my art application for several weeks -
I did quickly run the demo using my image you added there - and it works perfectly!
I will dig further into my code and see if I can isolate the issue on my side...
Thanks again for your kindness!
-wayne