[Pijotre]

Hey hey Leu <3 ,

so you did a great job for your first map, however a few issues that I struggled with at first too. Also the whole messing around with coordinates is only needed if you make a new custom map where you don't know the zonrect. Since Fowlumbra uses the same map as Thalumbra, the Everdeep we can reuse that zonerect. Sadly on some zones like this which use the online map version you can't find it in your files, but me or Jnils are more than happy to get it to you.
In this case it's: -1499.00, -1057.00, 1296.00, 1036.00
You also want to correct the sourcerect to be inline with the actual imagesize (The image i created has the dimensions 983 x 740, however each dimension needs to be divisible by 4 so we use 0,0,984,740 for the SourceRect).
With those changes and the dds I supplied below could you test this again? Since I don't have access to Fowlumbra :-( Also don't need menugroup, the zone is so rare that it doesn't have to be listed in the menu imho.

<ImageStyle Name="exp12_rgn_umbra02_epic01" displayname="Fowlumbra" zonerect="-1499.00, -1057.00, 1296.00, 1036.00" >
<ImageFrame Source="images/maps/map_exp12_rgn_umbra02_epic01.dds" SourceRect="0,0,984,740" />
</ImageStyle>

As for saving the image as .dds with Gimp I use the settings you can find in the attached image.