Instructions and Qualification Test for Sharpness and Contrast Adjustment in Painterly Rendering

Your task is to compare the sharpness and contrast of shiny materials shown in two images. One image has been created using a painterly rendering algorithm.
This qualification test is designed to explain what we mean by "painterly rendering" and "shiny materials".

Painterly rendering

A painterly rendering algorithm gives to an image the look of a painting. Here are a few examples that use brush strokes of various sizes:

Original image ("realistic rendering")	Painterly rendering

Shininess

A shiny object has the appearance of a mirror with reflective highlights, while a matte object has the appearance of clay. Here are a few examples of shiny and matte objects:

These spoons are very shiny	These cats are matte

Contrast and Sharpness

Highlights on shiny objects can vary in two ways.
1) The sharpness of the highlight can vary. For example, the highlight on the first teapot is very smooth, while it is much sharper on the second one.

This teapot has smooth highlights	This teapot has sharp highlights

In the following example, select the abstract shape that has the sharpest highlights.

Shape A	Shape B

2) The contrast of the highlight can also vary. Here the sharpness of the highlight is fixed but the contrast varies between the two abstract shapes.

This shape has low-contrasted highlights	This shape has high-contrasted highlights

The following images show two abstract shapes with different levels of sharpness and contrast in their highlights. Your task is to adjust the sharpness and contrast of the right image so that it matches the sharpness and contrast of the left image. Click the arrows to increase or decrease the sharpness and contrast of the right image. Take the necessary time to explore the effect of each slider. Once you are done adjusting the sharpness and contrast, scroll down to see the correct answer.

	Sharpness     Contrast

The answer is:

Sharpness

Contrast

Here is a second example:

	Sharpness     Contrast

The answer is:

Sharpness

Contrast

Finally, in this third example, the left image is rendered in a painterly style. Try to adjust the sharpness and contrast of the realistic image until it matches the painterly image.

	Sharpness     Contrast

The answer is:

Sharpness

Contrast