Your plugin kills color profiles when generating the different image sizes which makes them look like crap colorwise as there is no color management happening at that point. This really sucks, I’m guessing it’s all because of wordpress using the GL library. Imagmagic or whatever is an alternative to that which can retain color profiles but isn’t available on alot of shared servers like mine.
I’ve done a workaround for the original image size by using Ewww Image Optimizer and setting it one pixel below what the large image size on rtMedia would be. This works to keep all the camera settings and color profile on those images while still reducing the size. But… I can’t do that for the smaller images. I wish their was a way rtMedia could retain the color profiles in the images or find a way to work in harmony with a plugin like Ewww Image Optimizer so this can happen.