James Whayman [WildPress]

Just a quick work-around that I’m using for the moment:

function resize_image_uploads($data) {
    $field_id = $data->field_id;
    $field = new BP_XProfile_Field($field_id);

    if ($field->name === "Cover image") {
        $upload_dir = wp_upload_dir();
        $image_path = $upload_dir['basedir'] . $data->value;

        if ($size = getimagesize($image_path)) {
            $image = new Imagick($image_path);
            $image->resizeImage(400, 200, Imagick::FILTER_LANCZOS, 1);
            $image->writeImage();
            $image->destroy();
        }
    }
}

add_action('xprofile_data_before_save', __NAMESPACE__ . '\\resize_image_uploads', 15);

This link has answered my question.