Cover image darkening Answered

Hello,

I recently made an instructable and when i saved it, it always darkened the cover image so it made it really hard to see. I tried over and over again but every time and even with different pictures, after generating the image, it would make it really dark.

I'm wondering if there is a way to fix this? I hope it does not affect my instructable as it is entered in a contest.

I took a screenshot to show the difference, i might not look bad but on the contest its really dark.

Contest link

Instructable Link