timominous/tdimagecolors

iOS Library used to detect a number of most used colors in a UIImage instace.

TDImageColors

iOS Library used to detect a number of most used colors in a UIImage.

Installation

Using CocoaPods

pod 'TDImageColors', '~> 0.2'

Traditional method

Just download the source files and drag them into your project.

tdimagecolors's Issues

isDistinct problem with B&W photos

Hi, I've noticed a problem in the isDistinct method while comparing colors in a black and white picture.
I was comparing black (RGB 0, 0, 0) and white (RGB 1, 1, 1) and I noticed that the method only compares colors channels by subtracting R and G channels and then R and B channels.

So 0 - 0 < threshold and 1 - 1 < threshold, resulting in white and black colors being considered as not distinct, returning only one color while processing my image.

I then added a control for luminance as well, so if the colors are both in a grey scale AND their luminance is within the threshold, then consider them to be similar, otherwise not.

// Check for grays
if (abs(r - g < 0.03f && fabs(r - b) < 0.03f)) {
if (fabs(rc - gc) < 0.03f && (fabs(rc - bc) < 0.03f)){
//Also check for luminance!!
if(fabs([self luminance] - [color luminance]) < threshold){
return NO;
}else{
return YES;
}
...

After this, the color extraction works for B&W images as well, returning a grey scale palette.
I hope this can help you!

Add most used colours property

Could you please add weight for each colour and calculate an array with sorted ones?

How can I get the percentage of each colour?

Is there a way to get the percentage of each of the 5 colours?

Do we have similar library for the Android App

Hello Timominous,

Good to have your library in IOS, we also wanted the similar version in Android for our application.

Can you suggest some leads.

Thanks
Vicky

Color retrieving algorithm

Could you explain the color retrieving algorithm in the readme or in a separate file?