Check GD, repng2jpeg and ImageMagick.

PHP Version : 7.0.33
Server Soft : Apache
Server API  : cgi-fcgi
OS Name     : Linux
Machine Type: x86_64
Safe Mode   : Off
GD Library  : Version 2.3.3

GD Support check
Support GIF : OK
Support JPG : OK
Support PNG : OK

repng2jpeg(i386-linux) dynamic  : NG
                       standard : NG
                       static   : OK
 libjpeg  -> Not Found
 libpng   -> Not Found
 libz     -> Not Found
 libm     -> Not Found
 libc     -> Not Found
 ldlinux  -> Not Found

--------------------------------------------------
 repng2jpeg Not Found
--------------------------------------------------

ImageMagick : OK
 convert  -> /usr/bin/convert



!!! OMAKE !!!
« File Upload »
file_uploads           : On
max_execution_time     : 300sec
max_input_time         : 300sec
upload_max_filesize    : 2048MB
post_max_size          : 2048MB
« Send Mail »
sendmail_path          : /usr/sbin/sendmail -t -i
SMTP                   : localhost
smtp_port              : 25
« Multi Byte »
default_charset        : UTF-8
magic_quotes_gpc       : Off
mbstring.language      : neutral
mb_convert_encoding    : OK
iconv                  : OK
« Safe Mode »
open_base_dir          : NULL
disable_functions      : NONE
safe_mode              : Off
« Get Settings »
register_globals       : Off
allow_url_fopen        : On
short_open_tag         : On