Batch Image Processing

rctneil · 5 Nov 2009 at 19:05

ok, you have this when writing the text:

$text_width[2]

What does it mean?

marc2003 · 5 Nov 2009 at 19:10

PHP:

//php function to caluclate width of text
$text_width = imagettfbbox($fontsize, 0, $font, $filename);

imagettfbbox actually returns an array. so to get the actual width of the text you have to you use

PHP:

$text_width[2]

rctneil · 5 Nov 2009 at 19:25

Hey Marc,

I altered it to this:

PHP:

<?php
	//Allows unlimited execution time
	set_time_limit(0);
	
	//scan folder for jpg files and put them in an array
	$images = glob('old/*.jpg'); 

	//Sets font size and font file variables
	$fontsize = 20; 
	$font = './3.ttf'; //place font in same folder as this script 

	//loop through array
	foreach($images as $image) { 
		//basename create bare filename without folder/extension
		$orig_text = basename($image, '.jpg');
		
		//read current image into php resource $im that can be processed
		$im = imagecreatefromjpeg($image);
		
		//get width/height of image
		$width = imagesx($im);
		$height = imagesy($im);
		
		//calculate width/height of new image adding on extra for borders
		$new_width = $width + 60;
		$new_height = $height + 95;
		
		//create new image using the dimensions we've just worked out
		$new_im = imagecreatetruecolor($new_width,$new_height);
		
		//before you can use a colour, you have to define it first. uses RGB so 255, 255, 255  is white
		$bg = imagecolorallocate($im, 255, 255, 255);
		
		//fill our new image with this new colour
		imagefill($new_im, 0 ,0, $bg);
		
		//position the existing image into the new image
		imagecopyresampled($new_im, $im, 30, 30, 0, 0, $width, $height, $width, $height);
		
		//php function to caluclate width of text
		$text_width = imagettfbbox($fontsize, 0, $font, $orig_text);
		
		//definte our text colour -black in this case
		$tc = imagecolorallocate($im, 0, 0, 0);
		
		//If the width of the text is greater than the width of the image, then
		if($text_width[2] > $new_width)
		{
			//explode text at first hyphen
			$lines = split('-', $origtext);
			//Filename with new line added
			$final_text = implode("\n", $lines);
		} else {
			//else, Use the original text
			$final_text = $orig_text;
		}
		
		//write the text using
		imagettftext($new_im, $fontsize, 0, ($new_width - $text_width[2]) / 2, $new_height -20, $tc, $font, $filename);
		
		//writes the completed image to the new folder
		imagejpeg($new_im, 'new/' . $orig_text . '.jpg');
		
		//free up resources
		imagedestroy($im); 
		imagedestroy($new_im); 
	} 
?>

I tried it but it doesn't put any text on the image whatsoever. Any ideas?

marc2003 · 5 Nov 2009 at 19:35

PHP:

 imagettftext($new_im, $fontsize, 0, ($new_width - $text_width[2]) / 2, $new_height -20, $tc, $font, $filename);

$filename should be $final_text

rctneil · 5 Nov 2009 at 19:50

Hmm,

Now the text has come back, but on the images where it meets my 'if' condition, there is no text at all. Can you notice any reason why?

PHP:

<?php
	//Allows unlimited execution time
	set_time_limit(0);
	
	//scan folder for jpg files and put them in an array
	$images = glob('old/*.jpg'); 

	//Sets font size and font file variables
	$fontsize = 20; 
	$font = './3.ttf'; //place font in same folder as this script 

	//loop through array
	foreach($images as $image) { 
		//basename create bare filename without folder/extension
		$orig_text = basename($image, '.jpg');
		
		//read current image into php resource $im that can be processed
		$im = imagecreatefromjpeg($image);
		
		//get width/height of image
		$width = imagesx($im);
		$height = imagesy($im);
		
		//calculate width/height of new image adding on extra for borders
		$new_width = $width + 60;
		$new_height = $height + 95;
		
		//create new image using the dimensions we've just worked out
		$new_im = imagecreatetruecolor($new_width,$new_height);
		
		//before you can use a colour, you have to define it first. uses RGB so 255, 255, 255  is white
		$bg = imagecolorallocate($im, 255, 255, 255);
		
		//fill our new image with this new colour
		imagefill($new_im, 0 ,0, $bg);
		
		//position the existing image into the new image
		imagecopyresampled($new_im, $im, 30, 30, 0, 0, $width, $height, $width, $height);
		
		//php function to caluclate width of text
		$text_width = imagettfbbox($fontsize, 0, $font, $orig_text);
		
		//definte our text colour -black in this case
		$tc = imagecolorallocate($im, 0, 0, 0);
		
		//If the width of the text is greater than the width of the image, then
		if($text_width[2] > $new_width)
		{
			//split text at first hyphen
			$lines = split('-', $origtext);
			//Filename with new line added
			$final_text = implode("\n", $lines);
		} else {
			//else, Use the original text
			$final_text = $orig_text;
		}
		
		//write the text using
		imagettftext($new_im, $fontsize, 0, ($new_width - $text_width[2]) / 2, $new_height -20, $tc, $font, $final_text);
		
		//writes the completed image to the new folder
		imagejpeg($new_im, 'new/' . $orig_text . '.jpg');
		
		//free up resources
		imagedestroy($im); 
		imagedestroy($new_im); 
	} 
?>

marc2003 · 5 Nov 2009 at 19:59

PHP:

 $lines = split('-', $origtext);

typo.

rctneil · 5 Nov 2009 at 20:15

Right, Thanks,

Got it working on two lines now, just got to make alterations to:

- Center both lines

- Center a single line vertically but center a double lined image appropriatley.

When I have finished making changes, I'll post it here

rctneil · 5 Nov 2009 at 20:26

With many thanks to Marc for all his help in getting this to work. The final code I have used is shown below:

PHP:

<?php
	//Allows unlimited execution time
	set_time_limit(0);
	
	//scan folder for jpg files and put them in an array
	$images = glob('old/*.jpg'); 

	//Sets font size and font file variables
	$fontsize = 20; 
	$font = './3.ttf'; //place font in same folder as this script 

	//loop through array
	foreach($images as $image) { 
		//basename create bare filename without folder/extension
		$orig_text = basename($image, '.jpg');
		
		//read current image into php resource $im that can be processed
		$im = imagecreatefromjpeg($image);
		
		//get width/height of image
		$width = imagesx($im);
		$height = imagesy($im);
		
		//calculate width/height of new image adding on extra for borders
		$new_width = $width + 60;
		$new_height = $height + 95;
		
		//create new image using the dimensions we've just worked out
		$new_im = imagecreatetruecolor($new_width,$new_height);
		
		//before you can use a colour, you have to define it first. uses RGB so 255, 255, 255  is white
		$bg = imagecolorallocate($im, 255, 255, 255);
		
		//fill our new image with this new colour
		imagefill($new_im, 0 ,0, $bg);
		
		//position the existing image into the new image
		imagecopyresampled($new_im, $im, 30, 30, 0, 0, $width, $height, $width, $height);
		
		//php function to caluclate width of text
		$text_width = imagettfbbox($fontsize, 0, $font, $orig_text);
		
		//define our text colour -black in this case
		$tc = imagecolorallocate($im, 0, 0, 0);
		
		//If the width of the text is greater than the width of the image, then
		if($text_width[2] > $new_width)
		{
			//explode text at first hyphen
			$lines = split(' - ', $orig_text);
			
			//php function to re-caluclate width of text due to multiple lines
			$line_1_width = imagettfbbox($fontsize, 0, $font, $lines[0]);
			$line_2_width = imagettfbbox($fontsize, 0, $font, $lines[1]);
			
			//write the text using
			imagettftext($new_im, $fontsize, 0, ($new_width - $line_1_width[2]) / 2, $new_height - 40, $tc, $font, $lines[0]);
			imagettftext($new_im, $fontsize, 0, ($new_width - $line_2_width[2]) / 2, $new_height - 10, $tc, $font, $lines[1]);
			
		} else {
			//else, Use the original text
			$final_text = $orig_text;
			
			//write the text using
			imagettftext($new_im, $fontsize, 0, ($new_width - $text_width[2]) / 2, $new_height - 26, $tc, $font, $final_text);
		}
		
		
		//writes the completed image to the new folder
		imagejpeg($new_im, 'new/' . $orig_text . '.jpg');
		
		//free up resources
		imagedestroy($im); 
		imagedestroy($new_im);
		
		echo "FINISHED!";
	} 
?>