Lesson 3.1: Proportion, Measurement and Accuracy

Introduction

In the world of art and design, the ability to represent objects accurately is crucial for successful communication through drawing. This lesson focuses on the concepts of proportion, measurement, and accuracy in drawing, providing foundational skills that are essential for various artistic disciplines. The objectives of this lesson are:

1. Understanding systems for measuring and comparing proportions accurately.
2. Learning about sighting, units of measure, and relative scale.
3. Constructing an accurate underdrawing before adding detail.
4. Developing skills to check and correct a drawing against the subject.
5. Grasping why accuracy underpins both technical and creative work.

Proportion in Drawing

Understanding Proportion

Proportion refers to the relationship between the dimensions of different parts of an object or between different objects. Understanding proportions involves recognizing how sizes relate to one another within a composition or a drawing.

For instance, consider a simple example of a human figure. If the height of the figure is six head heights tall, then understanding proportion helps artists determine the appropriate size for the limbs in relation to the body. Accurate proportions ensure that the parts fit together harmoniously.

Systems of Measurement

Artistic measurement typically involves different systems—these can include relative measurement, absolute measurement, and using specific units.

• Absolute Measurement: This is the most straightforward form of measuring, where you can use a ruler to measure the actual dimensions of an object (in centimeters or inches).
• Relative Measurement: This involves measuring parts of an object in relation to other parts. For example, an artist may find that an arm is approximately half the length of the entire figure. This method is effective for maintaining proportion without needing exact measurements.

Worked Example 1: Measuring with the Pencil

To measure proportions using a pencil, follow these steps:

1. Hold your pencil vertically at an arm’s length.
2. Align the tip of the pencil with the top of the subject (for example, the top of the head).
3. Use your thumb to mark the spot on the pencil corresponding to the height.
4. Now, bring the pencil closer to your eye, ensuring it remains vertical, and measure other parts of the subject (like shoulders, waist, or limbs) against this initial mark.

This technique helps in acquiring accurate proportions simply by comparing different parts to a reference point.

Sighting Techniques

The Importance of Sighting

Sighting is a technique artists use to ensure accurate proportions and perspectives are captured while drawing or painting. It requires keen observation and can significantly improve the correctness of a drawing.

Methods of Sighting

1. Vertical and Horizontal Lines: Using a straight edge or your pencil, draw imaginary vertical and horizontal lines to see how different components align.
2. Cross Multiplication: This method compares two points in the drawing, allowing you to see if one part is too large or too small. For example, if a leg looks too short, compare it to the length of the torso.

Worked Example 2: Checking Proportions by Sighting

1. Draw a simple outline of a human figure.
2. Choose an identifiable point to start (for example, the chin).
3. Use techniques described to draw horizontal lines outward to locate and check the alignment of the shoulders, elbows, and hips compared to the chin.
4. Continue to adjust the figure based on where these lines fall to maintain proportion.

Constructing an Accurate Underdrawing

The Purpose of an Underdrawing

An underdrawing is a preliminary sketch that establishes the correct proportions and placements of elements in a composition before any detailing or coloring is applied. This step is crucial in achieving accuracy within a drawing.

Steps for Creating an Underdrawing

1. Lightly Sketch the Basic Shapes: Start by mapping out simple geometric shapes that represent different components of the subject (e.g., circles for heads, rectangles for torsos).
2. Refine the Shapes: Gradually refine these shapes into more recognizable forms while checking proportions continually.
3. Build More Detail: Once proportions are established, begin adding more detail to the underdrawing, refining shapes into forms.

Worked Example 3: Building an Underdrawing

1. Choose a still life object, such as a vase and some fruit.
2. Start with basic shapes representing the overall composition (the vase as a cylinder, fruits as circles or spheres).
3. Compare the size of the vase relative to the fruit using sighting techniques noted earlier.
4. Gradually refine these shapes to closely resemble the actual objects, ensuring proportions are accurate before moving on to detail and shading.

Checking and Correcting a Drawing

Importance of Review

Reviewing a drawing to check and correct it against the subject is vital to ensure accuracy. This process involves stepping back to reassess proportions, spatial relationships, and alignments.

Techniques for Checking a Drawing

1. Compare with Reference: Hold your drawing against the reference subject. Look at the overall sizes and check if they match.
2. Use of Measurement Tools: Utilize rulers or calipers to confirm measurements are accurate between analogous points in both drawing and subject.
3. Feedback: Seek feedback from peers or instructors who can provide an objective view of your work.

Worked Example 4: Correction Technique

1. After completing an initial drawing of a landscape, step back to analyze proportions.
2. Take a ruler and measure the height of the trees in relation to the house in your drawing; for instance, if the trees should be taller, adjust them without erasing the entire drawing, just make the necessary corrections.
3. You can also use proportional grids to overlay on your drawing for reference.

Conclusion

Mastering proportion, measurement, and accuracy is integral to achieving satisfactory results in both technical and artistic endeavors. These skills enable artists to communicate complex ideas effectively through their work. By employing correct sighting techniques, constructing underdrawings, and applying systematic checks, students can enhance their drawing skills significantly. Remember that the process of measuring and correcting is as important as the drawing itself; meticulousness leads to precision and ultimately greater artistic success.

Study Notes

• Proportion refers to how dimensions relate to one another in a composition.
• Use absolute and relative measurement systems for accurate drawing.
• Employ sighting techniques (vertical/horizontal lines, cross multiplication) for proper alignment.
• Underdrawings serve to establish proportions and placements before detailing.
• Always check and correct your work against real-world references for accuracy.