Hey there, let's work through this watermark font size issue you're facing. I've dealt with similar quirks using CodeIgniter's GD2 image processing before, so here are some targeted fixes to try:

1. Fix the wm_font_size Parameter Format #

First off, your current code uses a string value for wm_font_size:

$config['wm_font_size'] = '16';

The GD2 library expects an integer here, not a string. Using quotes might cause the value to be ignored or fallback to a tiny default size. Change it to:

$config['wm_font_size'] = 40; // Start with a larger integer to test

2. Ensure Your Font File is Accessible #

If CodeIgniter can't find your custom font file (./media/texb.ttf), it'll fallback to a system default font that's usually very small. Use CodeIgniter's built-in constant FCPATH to specify an absolute path (avoids relative path issues):

$config['wm_font_path'] = FCPATH . 'media/texb.ttf';

Double-check that the texb.ttf file exists in your media folder and has proper read permissions.

3. Verify GD2 FreeType Support is Enabled #

Sometimes the GD library doesn't have FreeType support enabled, which prevents loading custom TrueType fonts. Create a quick PHP file with phpinfo(); and search for FreeType Support under the GD section. If it's disabled, you'll need to enable it in your PHP configuration (this might require server access or updating your PHP setup).

4. Check for Conflicting Configuration Parameters #

Your wm_padding value is set to -300, which is an extreme negative value and could be causing the watermark to be scaled or positioned incorrectly. Try commenting out this line temporarily to see if the font size behaves as expected:

// $config['wm_padding'] = '-300';

You can adjust padding/offsets later once the font size is fixed.

5. Debug with Image Library Errors #

Always check for error messages from the image library—they'll tell you if something's wrong with font loading or parameters. After initializing the library, add this to catch issues:

$this->load->library('image_lib', $config);
if (!$this->image_lib->watermark()) {
    echo $this->image_lib->display_errors();
}
$this->image_lib->clear();

Example Modified Code #

Here's how your adjusted config might look:

$imgpath = './images/posters/'.$filename; 
$newimgpath = './images/wm/'.$filename; 
$config['image_library'] = 'gd2'; 
$config['source_image'] = $imgpath; 
$config['wm_text'] = $ref_id; 
$config['wm_type'] = 'text'; 
$config['new_image'] = $newimgpath; 
$config['width'] = '50'; 
$config['wm_font_path'] = FCPATH . 'media/texb.ttf'; 
$config['wm_font_size'] = 40; 
$config['wm_shadow_color'] = '993300'; 
$config['wm_shadow_distance'] = '3'; 
$config['wm_vrt_alignment'] = 'bottom'; 
$config['wm_hor_alignment'] = 'center'; 
$config['wm_font_color'] = '#FFFFFF'; 
$config['wm_hor_offset'] = '350'; 
$config['wm_vrt_offset'] = '30'; 
// $config['wm_padding'] = '-300';

$this->load->library('image_lib', $config);
if (!$this->image_lib->watermark()) {
    echo $this->image_lib->display_errors();
}
$this->image_lib->clear();

Start with these steps—chances are the string font size or missing font file is the culprit. Let me know if you still run into issues!

内容的提问来源于stack exchange，提问作者Anna