The color of the “typed” signature must be set via “Right Mouse Click” -> “Properties” -> “Font Color”.
To change the color of the “drawn” signature, it must be added code to your theme functions.php as a “signature” controlled by Formidable Forms (#ff0000 must be changed to your color):
add_filter('frm_setup_new_fields_vars', 'sig_output_options', 30, 2);
add_filter('frm_setup_edit_fields_vars', 'sig_output_options', 30, 3);
function sig_output_options($values, $field, $entry_id = false) {
if ('signature' !== $field->type && !isset($field->field_options['label1'])) {
return $values;
}
global $frm_vars;
if (!empty($frm_vars['sig_fields']) && is_array($frm_vars)) {
foreach ($frm_vars['sig_fields'] as $sig_key => $sig_field) {
$frm_vars['sig_fields'][$sig_key]['text_color'] = '#FF0000';
}
}
return $values;
}