[gimp-book-painting] Added new chapters ...

[Americo Gobbo <amerigo src gnome org>]

commit 48a4fcb5639c6e62c7ffe09f7cd7b7eb3c20c1cb
Author: Americo Gobbo <jag rabisco gmail com>
Date:   Mon Jul 2 15:02:01 2018 -0300

    Added new chapters ...

 paint-dynamics-howto.md | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/paint-dynamics-howto.md b/paint-dynamics-howto.md
index bf066a7..b29fefe 100644
--- a/paint-dynamics-howto.md
+++ b/paint-dynamics-howto.md
@@ -5,8 +5,10 @@ Dry Media is normally associated with drawing tools, such as *graphite pencils*,
 These drawing tools depending of the material which is build releases onto support surface, in general 
paper, creating a characteristic mark.
 The dry media is probably the most ancestral way of visual communication, for instance, the Lascaux's and 
Altamira's caves are a great example of that.
 The dry media are the main tools to drawing and sketching on the most common artistic tasks.
+
 ### Dry Media Techniques
-Here I will try study how these aspects could be emulated via paint dynamics, for instance, the 'outline' 
technique is very simple to emulate but 'gradate' and 'layering' are just more complex, because they need 
blending capabilities.
+Here I will try study how these aspects could be emulated via paint dynamics, for instance, the 'outline' 
technique is very simple to emulate but 'gradate' and 'layering' are just more complex, because they need 
blending capabilities. Another aspect is also how each paint tool could be used to emulate these dry media 
techniques, for instance, the first four techniques we can use practically pencil, paintbrush and airbrush.
+
 The more common techniques are:
 
 1. Outline
@@ -16,12 +18,16 @@ The more common techniques are:
 5. Gradate (Back and Fort Stroke. Scumbling, )
 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, paintbrush). Instead, to 'Pointillism', 'Gradate' and 'Layering' we need 
paint tools with some capability to blending as is possible with 'Airbrush' and 'Smudge' (because they have 
control of Rate and Flow), though partially. The effective blending is done by blend modes applied directly 
on paint tool, what is possible only with 'Airbrush'.
+
+
 ### 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.
 Another important factor on the mark of dry media tools depending of kind support, for instance, a pressed 
paper when is compared with a textured paper (like as Ingres and Murillo papers, etc) has a grain more small 
and the material released of the dry tool will have an aspect different.
 In Digital Painting we don't have support concept while we are paint or drawing, except our works are 
printed. For this reason, many of digital tools or presets to emulate drawing tools must have also the 
emulation of support.
 
-#### The main aspects of dry media
+#### The main aspects of Dry Media
 The main aspects of dry media on real drawing/painting tasks are:
 1. Tip Aspect shapes of the tool. Each media tool has its own natural shapes or the capacity to produce 
different kind shapes following the orientation and gesture of the hand. For instance, the pencil and crayon 
has a similar tip: round when used with 60~90 degrees in relation of surface support and prismatic when is 
heavily inclined.
 2. Tilt/Pressure - mark variations along the stroke, for instance, when the tool is inclined/pressed, the 
stroke could modify how is the original mark is printed with the tool at 90 degrees with same weight. The 
quality mark can be modified mainly on the size, opacity/hardness, aspect and texture variations.
@@ -36,6 +42,9 @@ The parameters that we can use to emulate these aspects on digital painting coul
 5. Velocity and Acceleration (size, opacity, mark texture, );
 6. Blending skill [color (fg/bg); opacity x tilt, hardness x tilt, ...)
 
+#### Troubleshooting of knew issues
+
+
 ## References:
 1. [Dry Media 
Definition](https://helenatkn.wordpress.com/2016/03/15/dry-media-wet-media-digital-media-individual-research/ 
"Dry Media Definition")
 2. [Steven Saitzyk Website Project- Adjunt Professor at Art Center of Design in 
Pasadena](http://www.trueart.info/?page_id=289 "True Art Information - Information About Artist's Meterials")