Gravity Forms Image Validation

gf-image-validation.php

<?php
/* Gravity Forms Image Validation ~~~~> */
/* Add to functions.php and add a css class to the input, abp-image herein */
function ter_limit_profile_image_size($validation_result){
	$form = $validation_result['form'];
	foreach($form['fields'] as &$field){        
		if(strpos($field['cssClass'],'abp-image') === false ) continue;
		$is_hidden = RGFormsModel::is_field_hidden($form, $field, array());
		if($is_hidden) continue;
		$input_name = 'input_' . $field['id'];
		$temp_filename = RGFormsModel::get_temp_filename($form['id'], $input_name);
		$temp_location = RGFormsModel::get_upload_path($form['id']) . '/tmp/' . $temp_filename['temp_filename'];
		if(!$temp_filename) continue;
		if(isset($_FILES[$input_name]) && !empty($_FILES[$input_name])){
			$filesize = $_FILES[$input_name]['size'];
			$dims = getimagesize($_FILES[$input_name]['tmp_name']);
		} 
		elseif(file_exists($temp_location)){
			$filesize = filesize($temp_location);
			$dims = getimagesize($temp_filepath);
		}
		else continue;
		list($width,$height) = $dims;
		$max_size = 300;
		$min_width = 750;
		$min_height = 422;
		if($filesize > $max_size * 1024){
			$validation_result['is_valid'] = false;
			$field['failed_validation'] = true;
			$field['validation_message'] = 'Maximum banner image file size cannot exceed ' . $max_size . ' KB.';
			unset(RGFormsModel::$uploaded_files[$form['id']][$input_name], $_FILES[$input_name]);
			continue;
		}
		elseif($width < $min_width || $height < $min_height){
			$validation_result['is_valid'] = false;
			$field['failed_validation'] = true;
			$field['validation_message'] = 'Your profile image must be at least 750px wide, and 422px tall to diplay properly.<br>The image you uploaded is: ' . $width . 'px X ' . $height . 'px';
			unset(RGFormsModel::$uploaded_files[$form['id']][$input_name], $_FILES[$input_name]);
			continue;
		}
    }
    $validation_result['form'] = $form;
    return $validation_result;
}
add_filter('gform_validation_6','ter_limit_profile_image_size');
?>

Don't forget to change the form id in the filter, set to #6 here