Question

I have a problem..
There is some picture, like this:

and I want to add a new resolution, background, and better quality ( antialias) to this radar image. How can I get radar details from this image with a PHP script?

I have already this code, but the output isnt the best :S you can see it here:

<?
$im = imagecreatefromjpeg('a.jpg');
$f1 = imagecolorallocate($im, 39, 78, 231); 
$a = imagecreatetruecolor ( 520, 370 );
$red = imagecolorallocate($a, 39,78,231); 
for($x =130;$x<520;$x++)
{
for($y = 130; $y<370;$y++)
{
    $rgb = imagecolorat($im, $x, $y);
    $r = ($rgb >> 16) & 0xFF;
    $g = ($rgb >> 8) & 0xFF;
    $b = $rgb & 0xFF;

    $red = imagecolorallocate($a, $r,$g,$b); 
    //echo $r.$     g.$b."|";

    if( ($r < 100 && $r > 0) && ($g < 150 && $g > 0) && ($b < 255 && $b > 150))
        imagesetpixel($a, $x, $y, $red);
    if( ($r < 100 && $r > 0) && ($g < 255 && $g > 130) && ($b < 255 && $b > 0))
        imagesetpixel($a, $x, $y, $red);
    if( ($r < 200 && $r > 100) && ($g < 255 && $g > 180) && ($b < 80 && $b > 0))
        imagesetpixel($a, $x, $y, $red);
    if( ($r < 255 && $r > 0) && ($g < 255 && $g > 0) && ($b < 50 && $b > 0))
        imagesetpixel($a, $x, $y, $red);
    if( ($r < 255 && $r > 200) && ($g < 255 && $g > 70) && ($b < 70 && $b > 0))
        imagesetpixel($a, $x, $y, $red);
    if( ($r < 255 && $r > 200) && ($g < 100 && $g > 0) && ($b < 70 && $b > 0))
        imagesetpixel($a, $x, $y, $red);
    if( ($r < 120 && $r > 0) && ($g < 50 && $g > 0) && ($b < 50 && $b > 0))
        imagesetpixel($a, $x, $y, $red);
}
} 
//$rgb = imagecolorat($im, 550, 465);
//$r = ($rgb >> 16) & 0xFF;
//$g = ($rgb >> 8) & 0xFF;
//$b = $rgb & 0xFF;
//echo "$r $g $b";
header('Content-Type: image/png');
imagepng($a);
?>

Answer 1

replace kép.jpg with image. 1st try. I think I can adjust things to get closer.

2nd try: floor seems to be much better than round.

3rd try: added 2 filters to the code.

<?php
header('content-type: image/png');
//header('content-type: text/plain');


$im = imagecreatefromjpeg ('images/a.jpg');
list($width, $height, $type, $attr) = getimagesize('images/a.jpg');

$im2 = imagecreate($width, $height);

$x = 540;
$y = 353;

$colors = array();


$num = 100;
$num2 = 15 * 11 * $num;
$num3 = 100;

$num4 = 65;
$num5 = 15 * 11 * $num4;
$num6 = 65;

imagecolorallocate($im2, 255, 255, 255);
for ($k = 0; $k < 7; $k ++) {
    $ar = 0;
    $ag = 0;
    $ab = 0;

    for ($i = 0; $i < 15; $i ++) {
        for ($j = 0; $j < 11; $j ++) {
            $tc = imagecolorat($im, $x + $i, $y + $j + $k * 18);
            $ar += ($tc >> 16) & 0xFF;
            $ag += ($tc >> 8) & 0xFF;
            $ab += $tc & 0xFF;
        }
    }

    $c = new STDClass();
    if ($k == 0) {
        $c->r = floor ($ar / $num5) * $num4;
        $c->g = floor ($ag / $num5) * $num4;
        $c->b = floor ($ab / $num5) * $num4;
    } else {
        $c->r = floor ($ar / $num2) * $num;
        $c->g = floor ($ag / $num2) * $num;
        $c->b = floor ($ab / $num2) * $num;
    }

    $c->c = imagecolorallocate($im2, $c->r, $c->g, $c->b);

    $colors[] = $c;

    imagefilledrectangle($im2, 0, $k * 11, 15, $k * 11 + 11, $c->c);
}


$pixelmap = array();
$pm2 = array();
for ($i = 0; $i < $width; $i ++) {
    $pixelmap[$i] = array();
    $pm2[$i] = array();
    for ($j = 0; $j < $height; $j ++) {
        $pixelmap[$i][$j] = false;
        $pm2[$i][$j] = false;
        $c = imagecolorat($im, $i, $j);

        $r = ($c >> 16) & 0xFF;
        $g = ($c >> 8) & 0xFF;
        $b = $c & 0xFF;

        $r = floor ($r / $num3) * $num3;
        $g = floor ($g / $num3) * $num3;
        $b = floor ($b / $num3) * $num3;

        $r2 = floor ($r / $num6) * $num6;
        $g2 = floor ($g / $num6) * $num6;
        $b2 = floor ($b / $num6) * $num6;


        for ($k = 0; $k < 7; $k ++) {
            $colorOK = true;
            if ($k == 0) {
                if ($r2 != $colors[$k]->r) { $colorOK = false; }
                if ($g2 != $colors[$k]->g) { $colorOK = false; }
                if ($b2 != $colors[$k]->b) { $colorOK = false; }
            } else {
                if ($r != $colors[$k]->r) { $colorOK = false; }
                if ($g != $colors[$k]->g) { $colorOK = false; }
                if ($b != $colors[$k]->b) { $colorOK = false; }
            }
            if ($colorOK) { break; }
        }


        if ($k < 7) { // else no mathing color was found
            $pixelmap[$i][$j] = $colors[$k]->c;
            //imagesetpixel($im2, $i, $j, $pixelmap[$i][$j]);
        }
    }
}


for ($i = 1; $i < $width - 1; $i ++) {
    for ($j = 1; $j < $height - 1; $j ++) {
        if ($pixelmap[$i][$j] !== false) {
            if ($pixelmap[$i    ][$j - 1] !== false ||
                $pixelmap[$i + 1][$j - 1] !== false ||
                $pixelmap[$i + 1][$j    ] !== false ||
                $pixelmap[$i + 1][$j + 1] !== false ||
                /*$pixelmap[$i  ][$j + 1] !== false ||*/
                $pixelmap[$i - 1][$j + 1] !== false ||
                $pixelmap[$i - 1][$j    ] !== false) {
                //imagesetpixel($im2, $i, $j, $pixelmap[$i][$j]);
            } else {
                $pixelmap[$i][$j] = false;
            }
            $pm2[$i][$j] = $pixelmap[$i][$j];
        } else {
            $surroundColors = array();
            if (isset($surroundColors[$pixelmap[$i - 1][$j - 1]])) { $surroundColors[$pixelmap[$i - 1][$j - 1]]++; } else { $surroundColors[$pixelmap[$i - 1][$j - 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i    ][$j - 1]])) { $surroundColors[$pixelmap[$i    ][$j - 1]]++; } else { $surroundColors[$pixelmap[$i    ][$j - 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i + 1][$j - 1]])) { $surroundColors[$pixelmap[$i + 1][$j - 1]]++; } else { $surroundColors[$pixelmap[$i + 1][$j - 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i + 1][$j    ]])) { $surroundColors[$pixelmap[$i + 1][$j    ]]++; } else { $surroundColors[$pixelmap[$i + 1][$j    ]] = 1; };
            if (isset($surroundColors[$pixelmap[$i + 1][$j + 1]])) { $surroundColors[$pixelmap[$i + 1][$j + 1]]++; } else { $surroundColors[$pixelmap[$i + 1][$j + 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i    ][$j + 1]])) { $surroundColors[$pixelmap[$i    ][$j + 1]]++; } else { $surroundColors[$pixelmap[$i    ][$j + 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i - 1][$j + 1]])) { $surroundColors[$pixelmap[$i - 1][$j + 1]]++; } else { $surroundColors[$pixelmap[$i - 1][$j + 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i - 1][$j    ]])) { $surroundColors[$pixelmap[$i - 1][$j    ]]++; } else { $surroundColors[$pixelmap[$i - 1][$j    ]] = 1; };

            $c = array_keys ($surroundColors);
            $pm2[$i][$j] = ($c[0] == false ? false : $c[0]);
            //imagesetpixel($im2, $i, $j, $c[0]);
        }
    }
}

$pixelmap = $pm2;
for ($i = 1; $i < $width - 1; $i ++) {
    for ($j = 1; $j < $height - 1; $j ++) {
        if ($pixelmap[$i][$j] !== false) {
            if ($pixelmap[$i    ][$j - 1] !== false ||
                $pixelmap[$i + 1][$j - 1] !== false ||
                $pixelmap[$i + 1][$j    ] !== false ||
                $pixelmap[$i + 1][$j + 1] !== false ||
                /*$pixelmap[$i  ][$j + 1] !== false ||*/
                $pixelmap[$i - 1][$j + 1] !== false ||
                $pixelmap[$i - 1][$j    ] !== false) {
                imagesetpixel($im2, $i, $j, $pixelmap[$i][$j]);
            } else {
                $pixelmap[$i][$j] = false;
            }
        } else {
            $surroundColors = array();
            if (isset($surroundColors[$pixelmap[$i - 1][$j - 1]])) { $surroundColors[$pixelmap[$i - 1][$j - 1]]++; } else { $surroundColors[$pixelmap[$i - 1][$j - 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i    ][$j - 1]])) { $surroundColors[$pixelmap[$i    ][$j - 1]]++; } else { $surroundColors[$pixelmap[$i    ][$j - 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i + 1][$j - 1]])) { $surroundColors[$pixelmap[$i + 1][$j - 1]]++; } else { $surroundColors[$pixelmap[$i + 1][$j - 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i + 1][$j    ]])) { $surroundColors[$pixelmap[$i + 1][$j    ]]++; } else { $surroundColors[$pixelmap[$i + 1][$j    ]] = 1; };
            if (isset($surroundColors[$pixelmap[$i + 1][$j + 1]])) { $surroundColors[$pixelmap[$i + 1][$j + 1]]++; } else { $surroundColors[$pixelmap[$i + 1][$j + 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i    ][$j + 1]])) { $surroundColors[$pixelmap[$i    ][$j + 1]]++; } else { $surroundColors[$pixelmap[$i    ][$j + 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i - 1][$j + 1]])) { $surroundColors[$pixelmap[$i - 1][$j + 1]]++; } else { $surroundColors[$pixelmap[$i - 1][$j + 1]] = 1; };
            if (isset($surroundColors[$pixelmap[$i - 1][$j    ]])) { $surroundColors[$pixelmap[$i - 1][$j    ]]++; } else { $surroundColors[$pixelmap[$i - 1][$j    ]] = 1; };

            $c = array_keys ($surroundColors);
            //$pixelmap[$i][$j] = $c[0];
            imagesetpixel($im2, $i, $j, $c[0]);
        }
    }
}



imagepng ($im2);
?>