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[Uzin]

My contribution to the entitled question. 

   Using Online desert map, I drew the rivers by Gimp Beziers tool into a new layer above Mymap_c.tga, converted it into the line one pixel wide, then proceeded as given:


 1. blurred  it by Gaussian blurr one pixel wide,
 2. let it as it is,
 3. made a copy of the newly added  layer above the first one (i.e. two identical rivers added).
 
After each of the above steps, the added layer was joined with the original Mymap_c.tga.
Results you can see in the picturte below (no.4 is the original short river on desert map).

[max_thehitman]

OH Very nice  I like number 3 river.
Looks very very good.

[Uzin]

"True" width of the narrowest river (no. 3 in above picture) was measured using KevinP's mod Ruler KDP.
As you can see, it is 90 meters:

[Ranwers]

How it looking from a plane ?

[Uzin]

How it looking from a plane ?

Here it is, from 100m, 500m, 2000m and 5000m altitude:



As you can see, var. 3 is visible from all altitudes, var.2 can serve as semi-arid wadi, while var. 1 is only a dry wadi, with incidental pieces of wet area visible in its upper end.

[Ranwers]

For me - var. 3 super !

var 2 is good for brooks with trees...
In real live, from plane are visible only trees and somewhere some water

[Uzin]

As far as we know that standard size of Mymap_c.tga is : one pixel equals to 50 meters, the above findings might be surprising.
In order to better understand the situation, I drew another river on Desert map, this time 1 pixel wide, but directly into Mymap_c.tga, that is without any merging.  As we can see, the river is now precisely 50 meters wide, but consists of badly joined pieces. The selection which version would satisfy is upon user.

[Uufflakke]

Perhaps my experiments of the past are of any use,
Me too used to play with pixels and grey values on map_c to see what the result were.
I dug up some old screenies and with varying pixels and their grey values you can simulate ditches, meadows with pools of water, paddy fields and even waterfalls.










I also noticed some interesting things during those experiments that when creating pools of water close to seashore you get surf in pools.
While adding extra waterfalls and copypasting their grey values in map_c to another place nothing happened. Not even close to the first one.
It also depends where to put waterfalls, on the wrong side of mountain water crawls up. So perhaps when you add a couple of brooks you will experience same issues.
From high altitude paddy fields look like square waterbasins. Getting lower and landtextures become visible.

About your last 2 screenshots: what happens if you change the grey value of the one pixel size river. Instead of let's say 95 applying 85 or 110?
Perhaps riverbanks become blurry and so that river looks smaller and more natural?

[Uzin]

@Uufflakke:

I am notg sure if I understand correctly your question :
"About your last screenshot: what happens if you change the grey value of the one pixel size river. Instead of let's say 95 applying 85 or 110?
Perhaps riverbanks become blurry so that river looks smaller?"

because I drew one pixel river into Mymap_c.tga by RGB=0.

Here I tried to fulfill the request of our Polish friends concerning the small rivers in Lublin at Poland map, as rose in that thread:

https://www.sas1946.com/main/index.php?topic=36105.240

There are very nice narrow waterways in your pictures, especially among rice fields. I assume they  were obtained by drawing the lines strictly horizontally and/or vertically. Am I correct ?

[Uufflakke]

On second picture they are not waterways but fields with treelines added horizontal and vertical.
Perhaps I could have waterways by doing the same thing as on picture one: creating ditches.

With one pixel river set to RGB=0 you get deep rivers which look more like canals. Just as it is in your last images. By changing the RGB value rivers get more shallow and in case rivers don't show up perhaps you need to add higher RGB value next to it on map_c to make rivers become visible. I don't know how to explain it exactly, it is a matter of trial and error with RGB values. I noticed, when creating waterfalls, changing adjacent RGB values from (for example) RGB=85 to RBG=100 waterfalls disappeared. It is all about finding the right values to get small brooks, rivers, ditches or waterfalls.

I added waterfalls on Avala's Benghali map and Viking4570 Grand Canyon map. The d/l link is still somewher in those threads. In case you want to have a look at the map_C I created.

[Uzin]

@Uufflakke:

Many thanks for your inspiring work, I shall study your map_c definitely.
Just a question:
 isn't your rising of RGB values next to rivers similar to their Gaussian or similar blurring ?

[Uufflakke]

I don't know if it is similar to Gaussian blur. When testing I added some higher RGB values next to river and see what happened.

You have settings at 'Excellent' instead of 'Perfect' I guess? According the appearance of water and landnoise.tga.
That might give a different look in game when playing with RGB values.