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Thread: GIMP - Layer/background transparency issues and help with channels

  1. #1

    Help GIMP - Layer/background transparency issues and help with channels

    Hi all,

    I am a first-time cartographer and generally not a very artistically minded person, so I apologise in advance for any foolish mistakes I make/have made!

    I am currently working on converting a map drawn in AutoREALM to a more visually appealing map using GIMP. However, as I am a first time GIMP user, I have followed a guide posted on the Cartographers' Guild (link: https://www.cartographersguild.com/s...ad.php?t=10655). In doing so I have stumbled on some more general problems with GIMP, likely caused by my own ineptitude in following the aforementioned guide. However, as I cannot find any information online or posts by people with the same problems as me, I hope I can find some help here!

    Firstly, I have noticed rather a long way in to the process that my terrain layers appear to have some issue with transparency, or being bound in some regard to the background layer. When toggling the background layer off, all of my terrain layers disappear (please see attached screenshots). I was wondering if anyone had any ideas for remedying this, and hopefully an explanation as to what I have done wrong so I can avoid doing it again in the future!

    Secondly, while following the guide, I used a sketch of the coastline to generate a channel (see attached screenshots) to denote the location of the sea and other bodies of water. However, following the generation of this channel, the tutorial indicated that I should delete the coastline sketch, and I dutifully complied. I must have made some mistake in my process however, as my coastline no longer has a stroke defining it. So my question is: is it possible to generate an outline for a channel, in much the same way the Stroke Selection tool works? Or have I condemned myself to re-drawing my coastline?

    Finally, my river layer, despite being below all of my other terrain layers, is for some reason drawing over the top of everything else (see attached screenshots). Could this be something to do with the terrain layers being associated with the background layer in some way as suggested above? I am certainly going to re-do my rivers (as I am very unhappy with how they look), it's just that this subverts my entire (limited) understanding of how layers work!

    Thanks in advance for any help you can give!

    -Matt

    P.S - I am aware that there are likely many problems with the design of the map itself! Although it is not the purpose of this post, I will gladly accept any advice on how to improve my cartography prowess!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Terrain Layers - Background On.png 
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ID:	101205   Click image for larger version. 

Name:	Terrain Layers - Background Off.png 
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ID:	101206   Click image for larger version. 

Name:	Sea Channel - On (with border channel off).png 
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Name:	Sea Channel - Off (with border channel on).png 
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ID:	101208   Click image for larger version. 

Name:	Layer Order.png 
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ID:	101209  


  2. #2
    Guild Artisan Guild Supporter Tenia's Avatar
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    Hi Matt, for your first question : Could it be that some of these layers are not in "normal" mode ?

  3. #3
    Guild Grand Master Azélor's Avatar
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    The city dots and roads appear just fine.

    You should be able to select the channel and create a, outline like you would with a normal layer.

  4. #4

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    Quote Originally Posted by Tenia View Post
    Hi Matt, for your first question : Could it be that some of these layers are not in "normal" mode ?
    Thank you very much Tenia, this did turn out to be the issue - they were in multiply mode! After some poking around I realised it was something to do with the layer mode (though I eventually I gave up and manually erased some parts of various layers to circumvent the issue) but this confirms it!

    Quote Originally Posted by Azelor View Post
    The city dots and roads appear just fine.

    You should be able to select the channel and create a, outline like you would with a normal layer.
    And thank you Azelor, it's good to know I can do this in the future - I ended up giving in and manually re-tracing the coastline, but in the future this would be much easier!

    The map is now in a fairly finished state, though as it is my first map I am not certain that it is of high enough quality for me to pollute the finished maps forum with it!

  5. #5
    Guild Artisan Guild Supporter Tenia's Avatar
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    You're welcome, Hang in there for your project !

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