Blend mode colour in Gimp

[Pemican72]

Hey Everyone

http://www.fantasticmaps.com/2015/02/how-to-draw-a-map/ - Jonothan Roberts

I'm trying to follow this terrific guide but get caught at the Lay in the basic colours step.

I can't post pictures but where he goes from brown landscape to green I can, with overlay layers or brushes, only get deeper shadows and I can't find an option to set the blend mode to colour?

He is using PS but he say's you can achieve the same effects in Gimp. 

Can anyone help out? much appreciated for any feedback

Thanks
Nick

[Ofnuts]

This is either HSL Color or LCH Color (at the bottom of the list). In effect, this creates an image from the Luminosity (L in HSL/LCH) of the bottom layer, and the color (H+S or C+H) of the top layer.

[rich2005]

Using Gimp 2.8 ? - Why not update. However, Gimp is great for experimenting, add your layer, paint in it and run through the layer modes. Possibly one that does have colour in the name, Overlay mode looks promising https://i.imgur.com/0n90Baq.jpg (edit and ps - if using the image from the web site it is in indexed mode, change to RGB)

[Pemican72]

(11-02-2020, 09:07 AM)rich2005 Wrote: Using Gimp 2.8 ? - Why not update. However, Gimp is great for experimenting, add your layer, paint in it and run through the layer modes.  Possibly one that does have colour in the name, Overlay mode looks promising  https://i.imgur.com/0n90Baq.jpg  (edit and ps - if using the image from the web site it is in indexed mode, change to RGB)

---

Thanks for the replies peoples.

I've tried both of those HSL and LCH which either produce peppermint greens or shadows. I guess Gimp can't do it so I'll have to try other options.

Thanks
Nick

[Ofnuts]

(11-03-2020, 02:53 AM)Pemican72 Wrote:

(11-02-2020, 09:07 AM)rich2005 Wrote: Using Gimp 2.8 ? - Why not update. However, Gimp is great for experimenting, add your layer, paint in it and run through the layer modes.  Possibly one that does have colour in the name, Overlay mode looks promising  https://i.imgur.com/0n90Baq.jpg  (edit and ps - if using the image from the web site it is in indexed mode, change to RGB)

---

Thanks for the replies peoples.

I've tried both of those HSL and LCH which either produce peppermint greens or shadows. I guess Gimp can't do it so I'll have to try other options.

Thanks
Nick

As says your tutorial:

Quote:When using colour layers I’ve found it’s best to start with a very low opacity brush (10% or less) and never use highly saturated colours. Otherwise you end up with neon lines across your map and it looks very bad very quickly.

In practice you can either use a low opacity brush on layer at 100% opacity, or a 100% opaque brush on  a layer with low opacity or a it of both (so that you can still adjust the final effect by adjusting the layer opacity).

   

Otherwise, screenshots and your settings?

[Pemican72]

OK here are the original image
https://hosting.photobucket.com/images/i...&crop=fill

Overlay layer- normal brush - opacity 20%
https://hosting.photobucket.com/images/i...&crop=fill

Normal layer - overlay brush - opacity 20%
https://hosting.photobucket.com/images/i...&crop=fill

Normal Layer - HSV brush - opacity 20% (HSV layer mode made no visible changes)
https://hosting.photobucket.com/images/i...pbase4.png

Normal Layer - HSL brush - 20% opacity (HSL layer mode made no visible changes)
https://hosting.photobucket.com/images/i...se5.pngHSL

Hope this is clear enough
Nick

[rich2005]

Not using Gimp 2.8 is now clear, so using Gimp 2.10

Just my two euros worth:

I do think painting on a transparent layer using a brush in a 'mode' is a good idea. One or the other
Paint tool (normal) and use a layer mode or
Paint tool (some mode) into the land area directly.

Why use a dynamic mode 'Village Houses' ? Turn Dynamics off.

Lots and lots of layers there , not easy to see how they interact, try using layer groups - say houses / land / forrest etc.

Using the mouse wheel, easy to scroll through layer modes to examine the effect. Gimp 2.10 maybe LCh hue

example: https://i.imgur.com/Wc1Yvug.mp4

[Pemican72]

Thanks guys, some good ideas there. Thanks for making the Gif rich2005, I shall try breaking things up and down and see where we go!

Cheers
Nick

[Pemican72]

Realising where our miscommunications may be occuring!

In his tutorial Jonothan
- Creates a New Layer - not edits an existing layer as this causes the existing layer to be changed. You can't go back later and delete the layer to revert the changes, you'd either have to use the Ctl-Z key repeatedly or redo the whole layer.
 
"Start by creating a new layer, and set the blend mode to colour. This means that anything you draw on that layer won’t affect the underlying tone (light and dark) of your piece, but will set the hue and saturation. So we can keep all of that shading work we did, and add colour on top"

- He is painting the whole picture, not just selected areas. He doesn't have a grass group, forest group, house group etc. He is painting this green layer over the whole canvas concentrating on the grass and tress to build up colour.

- He creates brush behaviour using in session tools the makes its colour jitter between two preset extremes, using existing brush settings. 
 
"I start with the largest areas first. I pick a mid green for the foreground, and a different mid-green for the background colour. Then, I pick my grunge brush again, and in the brush settings I set colour jitter. This means that the colour will change as you draw. This is key – it’s never the case that you get one colour uniformly across a natural area. This means you don’t have to change colour hundreds of times, photoshop (or Gimp) will add the colour variation for you.
Here’s the settings I use – note the two greens in the foreground/background colour picker. They are different I swear. The foreground green has more yellow in it.
How to set foreground/background jitter The 100% foreground background jitter means that the brush can be entirely the foreground colour, entirely the background colour, or anything in between. The saturation and brightness jitters allow the brush colour to vary away from the foreground and background colours. This gives a decent range of colours without going too far from your core colours.

https://hosting.photobucket.com/images/i...&crop=fill

He is painting a nondestructive colour layer over the top of everything with a brush that jitters between colors in a whole preset spectrum and can build over itself adding more colour without adding more shadows or highlight.
I've done it before using PS when my employer had access to the lisence. Is Gimp able to reproduce these settings without having to make a special brush, special filter or layer setting?

[rich2005]

First rule: Gimp is not Photoshop. You might end up with a similar result but getting there can be very different.
Second rule. Do not look at PS tutorials other than for that end result. There are no exact equivalents to adjustment / effect layers.
Third rule: Do not harp on about "when I used PS but now (sob) I have to use Gimp."

Quote:...snip...Is Gimp able to reproduce these settings without having to make a special brush, special filter or layer setting?

Probably not, but it is so easy to make brushes and patterns and the golden rule - experiment.

Since we are using Gimp 2.10 then I might use the random colour dynamic. Random is not very random, just goes between FG and BG colour. A brush, chalk brush maybe. this is an animated brush, a gih which adds a bit of variation to the brush shape.

Side-by-side example: https://i.imgur.com/OosYl9H.jpg

Tip: By default Gimp saves settings between sessions. That dynamic setting will came back to haunt you. It is possible to set Gimp up so that it starts up with a defined setup. All depends on the user.

The tutorial you referenced is very nice, in fact I dumped it to a PDF for reference. The author does use a drawing tablet, so much is artistic ability.

Appropriate for this Gimp 2.8 forum section A Gimp tutorial on the same subject
https://www.cartographersguild.com/showt...php?t=1142