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1. drupal
   1. drupal6 image.gd.inc
   2. drupal7

Validate the submitted GD settings.

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Image toolkits

Drupal's image toolkits provide an abstraction layer for common image file manipulations like scaling, cropping, and rotating. The abstraction frees module authors from the need to support multiple image libraries, and it allows site…

Code

modules/system/image.gd.inc, line 46

<?php
function image_gd_settings_validate($form, &$form_state) {
  // Validate image quality range.
  $value = $form_state['values']['image_jpeg_quality'];
  if (!is_numeric($value) || $value < 0 || $value > 100) {
    form_set_error('image_jpeg_quality', t('JPEG quality must be a number between 0 and 100.'));
  }
}
?>