First, Juicebox is stripping the ICC Profile from the image (it doesn't do this to unresized images).
When JuiceboxBuilder-Pro resizes images, it strips all metadata (EXIF, IPTC, ICC Profiles). If you need to retain metadata in your gallery's images, then the only option is to deselect the 'Resize Images' checkbox and allow JuiceboxBuilder-Pro to copy your original images across to the gallery's 'images' folder.
If you plan to use multi-size images and want to retain metadata, then you will need to create your own sets of images (in an imaging program such as Adobe Photoshop) and replace the ones generated by JuiceboxBuilder-Pro. If you are just creating one or two multi-size image galleries, this might be a possible workaround. As long as you allow JuiceboxBuilder-Pro to create multi-size images (and then replace them with your own images with the same filenames after the gallery has been created), then the smallImageURL and largeImageURL entries will be in place in the gallery's XML file and the functionality will still be there in the gallery.
Also, the resized images look soft.
Try increasing the quality of the images from the default value of 80 to something higher to see if this helps.
If you want more control over the images in your gallery than JuiceboxBuilder-Pro can provide, then you will have to create your images elsewhere and copy them into your gallery folder.
However, please post any suggestions you may have in the Feature Requests thread.
I cannot promise that your suggestions will be incorporated into future versions of Juicebox but it is certainly the best place to post ideas such as these.