Text to image convertion using php getting blur image - php

Question

I have used https://github.com/ttodua/useful-php-scripts/blob/master/text-to-image.php for text to image convertion.
Actually i have to create an image from text and show it on different background colors. for that created a transparent image and showing on red background colour. but showing white color patches around the text while creating the transparent image. How can i create smooth text image on any background color?
Could you please help me on this. below is my code.
My Html
<div class="box--h logo_bg_color1_preview fl-d fl-ac" style="background-color:red;">
<div class="box--l fl-d fl-ac">
<img src="logo.png?q=0.73948100 1606166692">
</div>
</div>
My Converted Image transparent background
public function hexToRgb($hex, $alpha = false) {
$hex = str_replace('#', '', $hex);
$length = strlen($hex);
$rgb['r'] = hexdec($length == 6 ? substr($hex, 0, 2) : ($length == 3 ? str_repeat(substr($hex, 0, 1), 2) : 0));
$rgb['g'] = hexdec($length == 6 ? substr($hex, 2, 2) : ($length == 3 ? str_repeat(substr($hex, 1, 1), 2) : 0));
$rgb['b'] = hexdec($length == 6 ? substr($hex, 4, 2) : ($length == 3 ? str_repeat(substr($hex, 2, 1), 2) : 0));
if ( $alpha ) {
$rgb['a'] = $alpha;
}
return $rgb;
}
function TextToImage($text="hello world",$textColor)
{
$newline_after_letters=40;
$font='./myfont.ttf';
$size=24;
$rotate=0;
$padding=2;
$transparent=true;
$bg_color=array('red'=>255,'grn'=>255,'blu'=>255);
$textRgbColor = $this->hexToRgb($textColor);
$color=array('red'=>$textRgbColor['r'],'grn'=>$textRgbColor['g'],'blu'=>$textRgbColor['b']);
//other version: pastebin(dot).com/XVVUyWGD
$amount_of_lines= ceil(strlen($text)/$newline_after_letters)+substr_count($text, '\n')+1;
$all_lines=explode("\n", $text); $text=""; $amount_of_lines = count($all_lines);
foreach($all_lines as $key=>$value){
while( mb_strlen($value,'utf-8')>$newline_after_letters){
$text_final .= mb_substr($value, 0, $newline_after_letters, 'utf-8')."\n";
$value = mb_substr($value, $newline_after_letters, null, 'utf-8');
}
$text .= mb_substr($value, 0, $newline_after_letters, 'utf-8') . ( $amount_of_lines-1 == $key ? "" : "\n");
}
//
Header("Content-type: image/png");
$width=$height=$offset_x=$offset_y = 0;
if(!is_file($font)) { file_put_contents($font,file_get_contents('https://github.com/potyt/fonts/raw/master/macfonts/Arial%20Unicode%20MS/Arial%20Unicode.ttf')); }
// get the font height.
$bounds = ImageTTFBBox($size, $rotate, $font, "W");
if ($rotate < 0) {$font_height = abs($bounds[7]-$bounds[1]); }
elseif ($rotate > 0) {$font_height = abs($bounds[1]-$bounds[7]); }
else { $font_height = abs($bounds[7]-$bounds[1]);}
// determine bounding box.
$bounds = ImageTTFBBox($size, $rotate, $font, $text);
if ($rotate < 0){
$width = abs($bounds[4]-$bounds[0]);
$height = abs($bounds[3]-$bounds[7]);
$offset_y = $font_height;
$offset_x = 0;
}
elseif ($rotate > 0) {
$width = abs($bounds[2]-$bounds[6]);
$height = abs($bounds[1]-$bounds[5]);
$offset_y = abs($bounds[7]-$bounds[5])+$font_height;
$offset_x = abs($bounds[0]-$bounds[6]);
}
else{
$width = abs($bounds[4]-$bounds[6]);
$height = abs($bounds[7]-$bounds[1]);
$offset_y = $font_height;
$offset_x = 0;
}
$image = imagecreate($width+($padding*2)+1,$height+($padding*2)+1);
$background = ImageColorAllocate($image, $bg_color['red'], $bg_color['grn'], $bg_color['blu']);
$foreground = ImageColorAllocate($image, $color['red'], $color['grn'], $color['blu']);
if ($transparent) ImageColorTransparent($image, $background);
ImageInterlace($image, true);
// render the image
ImageTTFText($image, $size, $rotate, $offset_x+$padding, $offset_y+$padding, $foreground, $font, $text);
imagealphablending($image, true);
imagesavealpha($image, true);
// output PNG object.
$finalImage="abc.png";
imagePNG($image, $finalImage, 0, NULL);
imagedestroy($image);
}