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Bug #35808 ImageTTFtext output Black&White image error
Submitted: 2005-12-26 17:55 UTC Modified: 2006-01-09 20:39 UTC
From: pm5884 at email dot si Assigned: pajoye (profile)
Status: Not a bug Package: GD related
PHP Version: 4.4.1 OS: WinXP
Private report: No CVE-ID: None
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 [2005-12-26 17:55 UTC] pm5884 at email dot si 
Description:
------------
A interesting problem with imagettftest function, it can't output 2 color (black & white - 1 BitsPerPixel) images. It always switches to at least 16 color's (4 BitsPerPixel). I need 2 color output, how can I get it???


Reproduce code:
---------------
<?
$image = ImageCreate(100,30);
$background_color = ImageColorAllocate($image, 255, 255, 255);
$text_color = ImageColorAllocate($image, 0, 0, 0);
$ttf_font = './font/Arial.ttf';
$text = 'test';
echo imagecolorstotal($image)."<br>";
ImageTtfText($image ,10 ,0 ,23 ,23 ,$text_color, $ttf_font, $text);
echo imagecolorstotal($image);
ImagePNG($image,"./file.png");
ImageDestroy($image);
?>

Expected result:
----------------
BLACK & WHITE image

Actual result:
--------------
16 clor image

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 [2005-12-26 18:10 UTC] pajoye@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Disable antialiasing if you want only 2 colors (bgd+fgd):
ImageTtfText($image ,50 ,0 ,23 ,23 , -$text_color, $ttf_font, $text);
 [2006-01-07 19:05 UTC] pm5884 at email dot si 
Thank you for your previous help, i must admit that  i don't have many experience with image and font manipulation.

With your help i have managed to make a Black&white image but the result is still not god enough.
I must write characters to a small image and in get a cut down characters (http://users.volja.net/pm5884/34.png and 32.png--please zoom in). 
Can i setup the imagettftext function so that i get better results?
Or is it a bug of antializing?
 [2006-01-09 20:39 UTC] pm5884 at email dot si 
I now that the GD library uses the Freetype library to generate glyphs.  Can it be possible that I most set another parameter to better hint characters (grid-fitting) when making small black & white characters? Is it possible to select hinting method when using  imagettftext()? Is there a another way to get better results?
 
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