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Art supplies Art theory Oil Painting Painting

The Color Temperature of Light: Lighting Still Lifes

Cool light, warm light with blocks, oil study
Cool light on the left; warm light on the right; same objects with white background; oils

When painting outdoors, lighting is controlled by the sun, clouds, atmosphere, and time of day. But in the studio you get to choose your lighting source from window light to bulbs of all kinds. In an article about color in the March 2011 Artists Magazine, Scott Burdick suggests an experiment to compare the effect of cool and warm light sources: Set up a still life of primary-colored objects and paint it twice; once under a warm light and again under cool light. That’s what I did in the studies above.

While I’m not sure I captured every nuance (or get the drawing just right), it’s interesting to see how different the same-colored objects and white background cloth look under different “temperatures” of light.

Warm Light. Left: Stroke counting; Right: One-colored shadow
Warm Light. Left: Stroke counting; Right: One-colored shadow

I did these two studies in Peggi Kroll-Roberts‘ studio, with the subjects lit by 150 watt incandescent bulbs which have an even warmer color temperature than the bulbs I used in my two top studies. The actual goal of the study on the left was to paint the scene (cantaloupe and watermelon slices) with as few brush strokes as possible. The assignment for the one on the right was to group and paint the shadows with one color only.

Lighting technical stuff:

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Art theory Oil Painting Painting Still Life

Limited Palettes 2-Color Studies

Clockwise from top left; all also include white: Cadmium Lemon Yellow + Sevre Blue; Cad. Yellow + Viridian; Cad. Yellow Pale + Permanent Rose; Ultramarine + Perm. Aliz., oil on 12x12" panel

Following in the footsteps of Kathryn Law’s 36 (!) color studies inspired by the Peggi Kroll-Roberts Limited Palettes video, I returned to doing more of my own. As Kathryn explains on her post, it’s all about learning what your colors can do.

The four at top I did yesterday, after switching back to regular oils (mostly Winsor & Newton). Below are some that I did previously using Holbein Aqua Duos water-soluble oils that I fell out of love with.

Dioxazine Violet & Quinacridone Red
Dioxazine Violet & Quinacridone Red; warm light, cool shadows

Dioxazine Violet & Cad Yellow Deep, V.1
Dioxazine Violet & Cad Yellow Deep, V.1

Dioxazine Violet & Cad Yellow Deep, V.2

Ultramarine Blue & Cadmium Orange; cool light, warm shadows

Phthalo Green and Cad Lemon Yellow; warm lights, cool shadows
Phthalo Green and Cad Lemon Yellow; warm lights, cool shadows

This is a really fun exercise. The idea is to discover about all the variations of value and hue that you can make with just two colors (plus white) and to experiment with using both cool and warm colors for the light or the shadows. It can be done with any medium (with watercolor you’d use two colors and vary the amounts of water instead of adding white).

Doing exercises like this is also a great way to have fun with paint when time is short or if there’s a big scary painting that you’re not quite ready to begin.

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Art theory Oil Painting Painting

Painting Value Studies with Peggi Kroll-Roberts DVDs

Block Study 5, from value to color
Block Study 5, from value to color, oil on canvas, 9x9"

After viewing and savoring my Peggi Kroll-Roberts DVDs, I’m doing the exercises she teaches in them, starting with value studies. To keep it simple and focus on values I used colored blocks for my subject. Above is the last study of the day in which I tried to apply to color what I’d learned by doing the gray-scale value studies below.

Value Study with blocks # 1
Value Study with blocks # 1, oil on canvas, 9x12"

One of the huge new (to me) things I learned from the Simple Value Plan DVD is that when you make a value plan for a painting, you can choose a range of values for the painting, such as making it high-key (mostly light) or  low-key (predominantly dark), rather than copying the values as you see them. Kroll-Roberts compares this to playing music in different keys.

She recommends making a value plan before starting a painting by simplifying and grouping shapes in the image into two or three values, with 1/3 light and  2/3 dark or vice versa for a more interesting design. In the study above on the right I used only mid to dark grays, for a low-key, predominantly dark study.

Value Study with blocks #2
Value Study with blocks #2, oil on canvas, 9x12"

Another tool she demonstrates is to first mix a value scale and put it at the bottom of your value plan study as I did above on the bottom right, and select your values from that scale. You can see the 3 blobs of paint at the bottom of most of these studies that indicate the values I intended to use.

Value study with blocks #3
Value study with blocks #3, oil on canvas, 9x12"

Above I wanted the study to use the full value scale, black, white and mid-gray. I noted the colors of the blocks and how I was interpreting their values (yellow and white blocks and beige table top = white/gray; red, green and blue = gray/black,  depending on if they were in light or shadow). I did some more adjusting of value once I had it blocked in so there are more than 3 values.

Value Study with blocks #4 - High Key
Value Study with blocks #4 - High Key, oil on canvas, 9x12"

On Peggi’s DVD High Key Value, she demonstrates creating a high key (mostly light values) painting by simply selecting the values that are mostly very light. I tried doing that with this study, and I think it works, but could have used an even lighter “darkest dark.”

Categories
Art theory Painting Sketchbook Pages Watercolor

Watercolor Class: Remnants & August Class Registration

Watercolor Glazing Exercise
Watercolor Glazing Study, 10 x 5"

My Sunday morning watercolor class focused on glazing this week. Glazing is applying a transparent layer of paint over painted or unpainted areas. Like a piece of colored glass, a glaze won’t hide what’s below it but will change the way it appears.

I used the study above to demonstrate glazing with gradations. To make the design I printed the word “HAPPY” in big capital letters and then playfully added more pencil lines between and around letters to make more shapes.

Then I glazed each shape individually, adding more glazed layers in various areas until it felt done. I used only transparent primary colors, so that they combined to create secondary colors.  You can also use glazing to make colors appear brighter, duller, darker, warmer, cooler or in shadow or to unify an entire painting or a section of it.

Journal parrot feather spread
Parrot painting strategy sheet, converted to journal entry use

A student who takes individual classes asked for help with painting birds so I used the journal spread above to demonstrate doing a pre-painting strategy session. I tried out various techniques and pigments as I thought about how I might paint the parrot whose photo we downloaded from Morguefile.com (where you are allowed to “copy, distribute, transmit and adapt” the copyright-free photos). Doing this bit of preparation and note-taking really helps to avoid some (but certainly not all) mistakes and corrections during the painting process. LATER I used the spread to write a journal entry (which I’ve blurred here for privacy), right over the feather and color experiments.

I still have these “cheat sheets” for many of my paintings. Recently I came across the one for Cheerios with Strawberries and saw that I’d used a wash of cobalt violet light (a favorite color but very expensive) to make the milk look just like the non-fat that I’d had in that bowl of cereal.

Flat and gradated wash demo
Flat and gradated wash demo

I loved the colors so much on this demo for flat and gradated washes from the previous week that I hung it on my wall as if it was a finished painting (my own mini Rothko).

Watercolor Class Registration
My next 4-week class session begins Sunday August 8. You can register and get more information on my website here. It looks like this session will fill so be sure to sign up soon if you want to join in. I am also planning a new “independent studies” class for people wanting to paint with ongoing coaching. If you’re interested, send me a note to get on the list.