Using PHP or non-programmatic tool to count pixels of select color in image

[mgm_03]

Is there a way using PHP's color-related functions or imageMagik to count up the number pixels of a certain color (hex or rgb) in a jpg?

If there is a non-programming means to achieve this, that's ok too...meaning a tool or software app, plugin, etc.

[Jake Arkinstall]

Well, unless there's a predefined method for doing this you would loop through all possible co-ordinates, and increment a variable for every pixel that is that color.

function getPixelCountByColor($image, $color){
    $currentCount = 0;
    for($x = 1; $x <= imagesx($image); $x++){
        for($y = 1; $y <= imagesy($image); $y++){
            if(imagecolorat($image, $x, $y) == $color){
                $currentCount++;
            }
        }
    }
} 

Edit:

By the way, I haven't tested it - that's just pseudo

[imaginethis]

Well, unless there's a predefined method for doing this you would loop through all possible co-ordinates, and increment a variable for every pixel that is that color.

function getPixelCountByColor($image, $color){
    $currentCount = 0;
    for($x = 1; $x <= imagesx($image); $x++){
        for($y = 1; $y <= imagesy($image); $y++){
            if(imagecolorat($image, $x, $y) == $color){
                $currentCount++;
            }
        }
    }
} 

Edit:

By the way, I haven't tested it - that's just pseudo

er... that's really slow... Just find the totaly x then the total y then multiply them since the image is a rectangle.

$x = 1;
for(;$ <= imagesx($image); $x++);

$y = 1;
for(;$y <= imagesy($image); $y++);

return $x * $y; 

[Jake Arkinstall]

The question isn't about getting the amount of pixels.

It's about getting the amount of pixels with a certain colour.

[mgm_03]

Great thanks....this helps.

[imaginethis]

The question isn't about getting the amount of pixels.

It's about getting the amount of pixels with a certain colour.

oh lol. sorry. I should read more ^_^