Hi, This is GD team 

When you upload your image files, the files might not upload properly or the outcome image might be shown broken.

In this case, please upload the JPEG file in RGB format. If you upload JPEG file in CMYK format, this site will NOT recognize it. You have to convert your JPEG file which are in CMYK format into RGB format JPEG files before you upload it.

For further information, please contact Sungmoo Shin on +82 31 780 2104 or email on smshin@kidp.or.kr.

Thank you.

GD Mark - It's my standard