Showing posts with label pigments. Show all posts
Showing posts with label pigments. Show all posts

Wednesday, January 29, 2014

Afternoon ride

This is an acrylic on loose canvas showing a horse rider on top of a hill. Using willow charcoal I did a rough sketch of the main elements of this painting.

A mixture of titanium white with rose madder and cobalt blue was used to underpaint the furthest hill. A second mixture was prepared consisting of ultramarine blue, vermillion and white for the other background hills, increasing blue and vermillion to darken the colour as I moved forward to the closer hills. The foreground including trees were painted with viridian and burnt umber mix. Trees in the mid-ground were blocked by adding cobalt blue mixture to the foreground mixture, increasing blue as I went to the background trees.

After drying I prepared a wash of naples yellow with white for the background using diagonal brush strokes. I added trees using the same background blue colour. I started to add more details to the trees using raw sienna and yellow ochre. Light is coming from the right hand side corner.

Using a mix of yellow ochre or Naples yellow ith white I continued adding highlights to the trees and as I approached the front part of the painting I starting adding washes of alizarin red, red gold and viridian. Warm colours like vermillion, touch of cad red medium, cad yellow and ultramarine blue were used for the front trees and grasses. Then I highlighted the horse with combination of burnt sienna, cad orange and yellow/white mix. 

Additional details were added such as tree trunks and pure colours for highlights.

Friday, November 1, 2013

Using Colours - mixing and characteristics


Placing colours on the pallette

When you decide which colours to use in the painting you are planning to do, you can place an amount from each colour from the tube onto the pallette. Always try to keep the same order of how you place the colours, usually using the order of the colour wheel. I usually place the colours in the order starting from reds on the left hand side, yellows and blues on the right hand side. I place White on the right hand side and browns just after the reds. Always place the colours on the upper part of the pallette and leave a lot of space for mixing colours.

Diluting colours

Most of the time we will need to dilute colours since they are usually too thick to use directly from the tube. You thin the colours by using one of the several media that are available. However for oil colours the most common diluents used are pure gum terpentine, odourless mineral spirits and refined linseed oil.
Since you want the underpainting to dry very quickly the best to use are odourless spirits or pure gum terpentine. I prefer the former due to lack of odour. You can dilute the paints either by dipping the brush in the mdium before picking the colours obviously adding amount of mineral spirit depending on what you want to achieve. The more diluent you add the thinner the paint and the more it dries quickly. This is good to do a wash for the underpainting. You can thin the colour especially white by adding drops of diluent onto it while mixing with painting knife until the paint has a consistency like a toothpaste.
For the next layer of paint I will dilute using a mix of 1:4 linseed oil with mineral spirit.
To decrease the drying time it is also wise to use liquin which decreases drying to almost 1/3 of the normal time.
In the case of acrylics usually you dilute with water or else one of the several media available that usually are used to increase drying time since acrylics dry very quickly especially in hot and dry conditions.

Drying Times

Different oil colours have different drying times. This is because oil colours do not dry by evaporation but by oxidation. Here are some examples:
Fast drying times (1 - 2 days) cobalt blue, Prussian blue, Raw sienna, umbers, Flake white
Medium drying times (5 days) permanent alizarin, cadmiums, ultramarine blue, ochres, burnt sienna, titanium white, zinc white
Long drying time (> 5 days) acrylamides, alizarin crimson, quinacridones

Use of colour in landscape painting

In order to create the illusion of distance as well as other characteristics such as time of the day or seasonal variations one has to know which colours to use in a landscape. As a general rule, very cool colours will recede in distance while warm colours appear to be at the foreground. However there are different blues, reds and yellows available that can in themselves be warm or cool. Here are some examples:

  • Cobalt and cerulean blues are cool blues very good for skies and distant objects especially when mixed with white. Add crimson as you move closer (turning purple) and a touch of raw sienna to change it to grey.
  • Ultramarine blue is a warmer blue and can be used for objects that are closer
  • Alizarin crimson is a cool red and so it is ideal for backrounds, to darken mountains and other objects as they come closer and to create shadows in the clouds or purplish colours in the skies. When mixing will alizarin crimson be cautious as the colour is very intense and you will only need to use very small amounts
  • Cad red, vermillion are warm reds with cadmiums being the warmer, so usually these are used for nearby objects
  • Cadmium yellow or orange are warm while lemon yellow is a cool colour. For background yellows or greens one can use raw sienna which can look yellow especially when mixed with white
  • Vermillion is a pure and very intense green but rarely used on its own due to its strong and artificial looking colour. You can use touches of vermillion mixed with other colours such as raw sienna to give a green tint.
  • Burnt umber can be used for foreground and the same for burnt sienna. Burnt umber creates an interesting green when mixed with veridian
  • Always try to darken a colour by using the opposite colour (complementary) on the colour wheel.
  • Indian yellow or Australian red gold forms a bright yellow (golden) when mixed with white.

Tuesday, October 15, 2013

Composition 3 - Oil Painting Landscape

Composition 3 - The Three Sisters


This is a painting I recently finished showing the iconic Three Sisters at the Blue Mountains. This is an oil on canvas board. I used 10oz cotton canvas on MDF board.
I am going to use this painting to go through the basic techniques of landscape painting. 
To start with, most landscape paintings have a background which usually includes the sky. The furthest mountains in this painting are part of the background. 
The midground refers to the closer mountains and the rock formations themselves.
The foreground at the bottom of the painting is the closest to the viewer.
To create the sense of distance and depth one has to use colour and also relationship of different objects to each other, i.e. the closer the subject is to you it looks bigger, more detailed and darker in colour.
Aerial perspective. When you look at a distant object like looking at mountains that are kilometers away, one tends to see them having a bluish colour. This is because there is atmosphere between the mountains and the viewer and this atmosphere is made up of gasses and humidity that scatters light coming from the sun while absorbing most colours leaving only blue to reach your eyes. So in a painting we need to create this effect. In the morning since there are more water droplets in the atmosphere the bluish colour seems to be stronger.
I started the painting with a rough sketch and underpaint using a wash of basic colours. I diluted the paints with odourless mineral spirit for fast drying.The underpainting was done using cobalt blue and titanium white for sky and background mountains, adding more alizarin crimson to the forground mountains and rock formations and dark burnt umber for the forground rocks.

Backround.
As a diluent for the rest of the painting I used a mix of 1:4 linseed oil with odourless mineral spirit.
After the first wash I left the painting to dry overnight. The next day the paint was almost completely dry.
Using a mix of titanium/zinc white I started from below the horizon line up into the sky. The distant sky has to be close to white. Cobalt blue was used for the upper part of the sky, darker at the corners and using a criss-cross brush stroke blended into the white of the distant sky creating a gradient.
The cloud was painted using a purplish shadow from cobalt blue and alizarin red. Using a 8 filbert brush I added the white highlights with a touch of burnt sienna, blending the colour into the shadow in a circular movement. Using a clean dry brush I softened the brush strokes using a diagonal brush stroke up into the right hand corner. The horizontal distant mountain at the horizon was done using a single brush stroke with cobalt blue onto the white underpaint. The lower part within the valley was left as white as possible to give the illusion of mist.
Midground
Using a mix of ultramarine blue + titanium white with a touch of alizarin I created the background mountain on the left hand side. Adding more blue and slightly more alizarin red I did the other mountain on the left hand side just behind the rock formations.
To the same mix I added slightly more ultra blue and more alizarin crimson creating a reddish purple. With this mix I painted the right hand side middle mountain.
The underpaint of the three sisters was painted using a mix of ultramarine blue + white + vermillion.
I started adding the details to the background mountains. The cliffs were painted with a mix of white with a touch of alizarin. I added a touch of very lemon yellow mix with white to the mountain behind the three sisters giving the hint of trees. The cliffs on the right handside mountain where painted with titanium white + alizarin + touch of burnt sienna (not completely mixed but left as marbled).
Using a mix of titanium white + raw sienna I started adding the grass and hint of trees to the right hand side mountain. The highlights were done by adding more white to the raw sienna. Using a filbert brush I added more trees from back to front, enhancing the brush stroke and leaving shadows from teh underpaint in between them. Using a liner brush and a mix of blue/white I added the tree trunks randomly throughout, increasing the size as I come forward.
The rock formations of the tree sisters were painted using a mix of white + alizarin + more burnt sienna partially mixed. I used a flat brush and a small painting knife to create the rock effect.
The trees around the three sisters were painted using a filbert brush loaded with a mix of titanium white + raw sienna + gray (made up of alizarin + ultramarine blue + touch of raw sienna) + very tiny spec of viridian green. Highlights were added randomly using a mix of white with Australian red gold (or if you want Indian yellow).
Foreground
Using a painting knife I sculptured the rock formation at the forground using a very dark mix of burnt umber, Payne's gray + burnt sienna. I partially mized these colours with titanium/zinc white and using the knife strokes in the direction the rocks are positioned. The shadow of the cliff edges was left with Payne's gray and burnt umber. I added a little bit of green colour (ultramarine blue and cadmium yellow medium) to the rock and also a touch of vermillion (red).
The bush was painted with the same mix of Payne's gray, burnt umber and viridian green. Highlights of the bush was painted with cadmium yellow medium, Australian red gold, white mix. I used pallette knife for most of the foreground including tree trunk of bush as it creates a really nice bold effect.

Hope you enjoy and that you found this information usefull.
Happy painting



Friday, September 6, 2013

Understanding Colour

When white light, coming from the sun or another light source, strikes an object it is then reflected back to our eyes by that object. Different surfaces absorb, reflect and mix light differently due to their structures and this is why we see different colours. So in painting, different pigments on the surface of the canvas are able to do the same. There are 3 different properties in colour:
1. Hue: or the colour itself eg. Blue, red, yellow
2. Value: or else the darkness or lightness of colour and this is what creates contrasts
3. Intensity or tone: pure colour comes from the tube but it is rarely used as pure and so it has to be mixed. 
 

Hue

The above picture shows the colour wheel. There are 3 primary colours from which all the other colours can be mixed.....Yellow, red, blue.
Secondary colours are those mixed from two of the primaries eg: blue + yellow = green
Tertiary colours are those mixed from a secondary and a primary eg: orange + yellow
Colours are said to be either warm or cool. Red is warm while blue is cool.
However there are warm blues (eg: ultramarine blue) and cool blues such as cerulean, cobalt and phtalo blue. There are also warm reds such as the cadmiums and cool reds (alizarin red).
The earth colours such as raw sienna, raw umber, burnt sienna and burnt umber are located at the inner part of the wheel towards the orange side.
Using cool colours for early morning scenes as well as for winter scenes while warm colours are used for afternoon or summer/Autumn scenes.
Appropriate use of warm and cool colours in a painting will give you depth and perspective, that is using blues for distant objects such as distant mountains and warm colours for foreground objects.

Value

The darkness and lightness of colour will give contrast and hence also useful for perspective. White is the lightest colours while black is the darkest...however black is rarely used in a painting as it is too strong (use Payne's grey instead). The addition of white to a colour will create a tint. Always keep an abundant amout of white available to use. Colours are usually darkened with a grey to create a tone. The addition of white or greys will affect the intensity of the colour. Adding black will create shade.

Suggestions applicable for oil painting

Always use artist quality oil paints (these contain more pigment and so do not fade when mixing). Also it will be easier to create texture when using knife for painting. You cannot work well with runny colours.
If oil colours are too thick then thin them with gum turpentine or linseed oil, only to a creamy consistency. The more oil you add the more time it takes for the painting to dry. Gum turpentine is usually added to colours used for the underpainting for fast drying.
Add more oil to the top layers of a painting as these has to dry the last., this is known as FAT over LEAN. If upper layers dry before the lower ones then this can cause cracking. Always paint in adequate ventilation as oil colours are toxic even if they do not smell. When starting painting, start from very dark (usually monochrome) underpainting, just indicating the basic shapes and structures and light/dark areas. Always keep in mind that there is no light if there is no dark and so you have to create contrast by putting highlights over darker areas. I will give more details how to use colours when discussing landscape painting.