domingo, 27 de outubro de 2013

Talking with Gustavo Deveze about Gimp Brushes

Recently I'm had presented to +gustavo deveze by +Guillermo Espertino. Gustavo Deveze use Gimp for your works and your style and technique is very beautiful. Me and Gustavo are talking about brushes on gimp for emulate the traditional painting techniques. This article is a re-editing of our thread.
The Bad Wolf, by +gustavo deveze, made on gimp with her brush. Made with Gimp.
The Bad Wolf, by +gustavo deveze, made on gimp with her brush.
About Gimp and their painting instances (Il Sugo ;)
On Gimp more easy to emulate dry techniques with their brushes. I've studied this topic very much... and I've discovered some tips to emulate better the wet with many brushes... included the dry brushes :) I don't had time yet to write my thread about this with Zabadal... but you can find some insights on:
the technique is very simple and intuitive:
  • choose a brush, preferentially a .gih, with a good sharpest and dimension (64 to 128 px). 
  • the brush must have layers with different stain (kind and quality). 
  • while you works make great variation on scale... the brushes when you scale with great factors the brush explodes and this causes many effects interesting. 
  • when you paint you need control the opacity between 15 to 35%... the natural watercolor have mainly this opacity range between the stains. 
  • the filter to blend directly on brush for me the Darken only is ideal... because this filter makes exactly the process that we've on watercolor [subtractive primaries].
  • This technique you can use with any brush... but for me I must to redesign many of my brushes to explore this possibility (they need more sharpness).
You can watch an old video about the my wet series made by my friend Mozart Couto...
is very illustrative of qualities of original series.

I've wrote something about:

L'ubomir Zabadal, in our mega thread about wet instances, wrote me, after some dynamics that I've sent him:

For wet techniques, I only suggest a small adjustment:

Tool Options:
Opacity 30-35 %, with a few brushes even 45% mode normal or multiply.

My suggestion to control the Wet instances on Paint Dynamics matrix is to have 'on':
Tool Options:
Opacity 15~35 %, Mode Darken Only.
Opacity > Pressure, Velocity
Size > Pressure, Velocity
Hardness > Pressure, Random (all constant curve kind)
Force > Pressure (idem)

Opacity and Blending Filter on Brush - Wet TechniquesThe opacity is and the blend filter applied on brush is very important.
Some brushes... very light have a high opacity other more dark low opacity. I don't have a formula for this... but is safe to keep on low opacity values. Other thing important is the blending filter... for me is better to use the "Darken Only", the kind blending equal the wet techniques [see: Subtractive primaries].
Paint Dynamics matrix for wet techniques.
Paint Dynamics matrix for wet techniques.

Controlling of the Blend Mode and Opacity for Wet Techniques.
Controlling of the Blend Mode and
Opacity for Wet Techniques. 

Some ideas about the Hardness and Force
I think useful to have a Hardness very precise and sharpest... the Hardness curve works so: the middle superior of the curve is the sharpness zone... and middle inferior is of the softness... in middle the sharpness and softness are equal. In some machines this parameter causes a bit of delay. But if this curve is constant or almost is more easy to processor calculate it.
Force settings is another parameter to increase the effect of the many parameters... in this sample is on pressure and random. I've noted that these two parameters can be more useful to increase or decrease the sharpness or softness of the brush stain.
Controlling Hardness to increase the sharp or soft effects on brushes.
Controlling of the Blend Mode and
 Opacity for Wet Techniques.
Modelling the force parameter to increase the effects on Hardness, Opacity and Size in function of Pressure.
Modelling the force parameter to increase the effects on
Hardness, Opacity and Size in function of Pressure.

I've made a small video with the main things, for me, to build a wet instance. In this video I've tried your brush, mainly in the chiaroscuro and modelling the volumes with wet colors:
Understanding how to build wet dynamics on gimp
Understanding how to build paint dynamics on gimp for Wet Techniques.
[with a Deveze Brush]

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