Mosaic to New Raster- Black Areas

[CarolineGlass]

I am attempting to create one dataset of several georeferenced TIF satellite images. When I use the Mosaic to New Raster function, it results in many black spaces that are not present when just looking at the photos. When I look at the properties, they all match and have blank "NoValue" columns. 

Would love any suggestions on how to fix this or explanations on what might be happening. 

Attached photos of what the new raster  looks like and what the georeferenced images look like. 

Thank you! 

[Georgios-NektariosTselos]

Hello @CarolineGlass  , I will recommend to you, before you press run, it would be good not to leave the NoData value field empty—set it to 0. This way, all values will be treated as 0, preventing black spots from appearing as in the first image. Most of the time, this is the cause of the issue. However, if you continue to face the same problem, something else might be responsible—possibly the way you downloaded the satellite images or even the way you have defined the RGB settings.

Best 

Georgios-Nektarios Tselos