[gimp-book-painting] Text revisions on howto-paint-dynamics and parametric-brushes articles...

[Americo Gobbo <amerigo src gnome org>]

commit 71b8a84aa95afb4636bd16542ce6423acc3bf5cf
Author: Americo Gobbo <jag rabisco gmail com>
Date:   Fri Jul 6 13:31:23 2018 -0300

    Text revisions on howto-paint-dynamics and parametric-brushes articles...

 paint-dynamics-howto.md | 24 ++++++++++++++++++++++--
 parametric-brushes.md   | 14 +++-----------
 2 files changed, 25 insertions(+), 13 deletions(-)
---
diff --git a/paint-dynamics-howto.md b/paint-dynamics-howto.md
index 715f771..5b1ff90 100644
--- a/paint-dynamics-howto.md
+++ b/paint-dynamics-howto.md
@@ -1,5 +1,6 @@
 # How to use the GIMP Paint Dynamics
 The main scope is describe the guidelines to emulate some paint techniques.
+
 ## Dry Media
 Dry Media is normally associated with drawing tools, such as *graphite pencils*, *charcoal*, *pastel* and 
*crayon*.
 These drawing tools depending of the material which is build releases onto support surface, in general 
paper, creating a characteristic mark.
@@ -19,8 +20,7 @@ The more common techniques are:
 6. Layering
 
 #### Paint Tools and Dry Media
-For the traditional techniques as 'Outline', 'Hatching' and 'Cross Hatching' is possible to use all main 
paint tools to drawing: pencil and paintbrush. These tools are interesting also to 'Pointillism', 'Gradate' 
and 'Layering' using the blend modes (Darken Only is my preferred), but the strokes are a bit uniform, some 
times it seems an opaque technique as 'Tempera' or 'Gouache'. Instead, using the 'Airbrush' or the 'Smudge', 
but mainly the 'Airbrush' because the Rate and Flow controls the blending is more effective and well done 
than other tools.
-
+For the traditional techniques as 'Outline', 'Hatching' and 'Cross Hatching' is possible to use all main 
paint tools to drawing: pencil and paintbrush. These tools are interesting also to 'Pointillism', 'Gradate' 
and 'Layering' using the blend modes (Darken Only is my preferred), but the strokes are a bit uniform, some 
times it seems an opaque technique as 'Tempera' or 'Gouache'. Instead, using the 'Airbrush' or the 'Smudge', 
but mainly the 'Airbrush', because it has the Rate and Flow controls and the blending is more effective and 
well done than other tools.
 
 ### Dry Media Marks and Emulation techniques
 In general all dry media are similar marks among them with variations on the granularity, e.g., the graphite 
pencil has different hardness and is possible to see the charcoal aspect with graphite pencils with hardness 
around 4B~6B.
@@ -44,6 +44,26 @@ The parameters that we can use to emulate these aspects on digital painting coul
 
 #### Troubleshooting of knew issues
 
+### Kind of Brushes
+GIMP has two types of brushes: the parametric and raster brushes (.gbr and .gih).
+The parametric brush is effectively a vector brush and it has the great possibilities and flexibility for 
many tasks in different tasks and branches (graphic design, photography, digital painting, etc...)
+The raster brush is also versatile and has great pictorial qualities but is more complex to build because is 
managed as image.
+Probably the choice, between raster and parametric brush, is done by the kind of task, the painter style and 
of his/her artistic background/knowledge/taste.
+
+#### Parametric Brushes
+Is possible to use the parametric brush for many of the traditional tasks of the painting, for instance, 
sketching, drafts, studies, etc. The parametric brush compared to .gih/.gbr brush is a bit poor, mainly when 
the artist  has a style more sophisticated, or in other words, an own style.
+
+The parametric brushes, in general, are working very well in many aspects, for instance:
+1. the processing is more fast when we comparing with .gih/.gbr brushes.
+2. the hardness is applied correctly on the shapes.
+3. has an own editor... instead the .gih/.gbr doesn't has.
+
+#### Raster Brushes (.gbr and .gih)
+The raster brushes are more knew for the majority of users and because mainly, the usage is more common or 
popular. When we compare with parametric brushes we have some advantages and not. In general, they are more 
interesting for the artists where their styles follow an texture finishing not usual or classic. With 
.gih/.gbr brushes, we can use any stain to emulate many real aspects of traditional techniques and they can 
be used in many ways: like as classic painter or like as Van Gogh. If you use the .gih brush, for instance, 
is more sophisticated than a .gbr brush because is possible to have more aspects and behaviors together and, 
this amplified in another way, more advanced, than the .gbr brush, that is essentially a static brush.
+
+Some against of raster brushes are:
+1. the hardness is not applied correctly/oddly on gih/gbr, see: 
https://gitlab.gnome.org/GNOME/gimp/issues/1081
+2. has not a own editor, instead is managed like as an image and plugins to create the binary archives.
 
 ## References:
 1. [Dry Media 
Definition](https://helenatkn.wordpress.com/2016/03/15/dry-media-wet-media-digital-media-individual-research/ 
"Dry Media Definition")
diff --git a/parametric-brushes.md b/parametric-brushes.md
index a635cec..488b797 100644
--- a/parametric-brushes.md
+++ b/parametric-brushes.md
@@ -8,12 +8,7 @@ Date: 2018 June
 
 ## Which is better as classical brush, the parametric or a raster brush?
 On GIMP the brush set have a small amount of parametric brushes… why reason? Sincerely I do not know, 
perhaps, many illustrators, concept artists, photographers have been accustomed to see/utilize only raster 
brushes.
-
-My idea is very simple, up to what point the parametric brush, as a classical brush, could be used on 
digital painting?
-
-I thought a simple test … I did a parametric calligraphic brush, very small with a radius equal to 12 px. 
After I have made a stamp of my parametric brush and build a static raster brush (.gbr).
-
-From my tests among both brushes, it results that the parametric is better than its equivalent .gbr, if are 
thinking in classic dabs, round, square, diamond and variations of shape forms based in spikes.
+The main scope of this article is to see the misused of parametric brush on GIMP and to demonstrate how is 
possible to use the parametric brush with paint dynamics to emulate many kind of media, for instance, the dry 
media.
 
 ![](parametric-brushes.assets/parametric-brushes-dialog-editor.png "Image Title")<br>*Brush set and 
Parametric Editor*
 
@@ -21,11 +16,6 @@ The default shapes are round, square and diamond. Is also possible create a grea
 
 The stroke of parametric brush is more sharpest and hard when we use hardness equal 1 when we compare with 
the raster brushes, is much easy to increase/decrease the softness via own editor or via Tool Options … 
instead the .gbr when we increase/decrease the hardness the stain is deformed by the blur algorithm how is 
possible in this gitlab issue: [Comparison test between hardness and Force with .gbr and .vbr 
brushes](https://gitlab.gnome.org/GNOME/gimp/issues/1081 "Issue #1081")
 
-## How to combine parametric brushes and paint dynamics
-I think is not possible have an unequivocal rule to combine brushes with paint dynamics, instead is possible 
to say that, in general: each paint dynamics represents an effect or a different technique.
-
-<figure><img src="" width="640" title="Mary Casset painting interpreted by Americo Gobbo" 
/><br><figcaption>Interpretation of Mary Cassat painting with pastel by Americo Gobbo. Dry Media paint 
dynamics with the brush set of parametric brushes.</figcaption></figure>
-
 ### Dry Media Experiments
 I thought to begin with classic main dry media as pencil, crayon, charcoal and pastel.
 
@@ -33,6 +23,8 @@ I think that an unique dynamic is capable emulate practically all these dry medi
 
 Basically the paint dynamic emulates the technique and the brush emulates the stain quality and 
characteristics of the medium, but this is not always true, what I am saying is: that in certain cases some 
stain marks could be alone and without paint dynamics represents a good mark for a dry medium, but with 
limitations to use effectively to paint. In general, a good paint dynamics dedicated to a paint technique, 
e.g., dry media, it could work with many stain marks also with marks thought or pulled by another medium as 
watercolor, for instance.
 
+<figure><img src="" width="640" title="Mary Casset painting interpreted by Americo Gobbo" 
/><br><figcaption>Interpretation of Mary Cassat painting with pastel by Americo Gobbo. Dry Media paint 
dynamics with the brush set of parametric brushes.</figcaption></figure>
+
 To explore I have revised a bit the Pencil Generic Paint Dynamics
 to adapt better it to other dry media and it is 
[here.](parametric-brushes.assets/parametric-brushes-Dry-Media.zip "Dry Media Paint Dynamics")