Adjust-hue for color rotation in SASS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the adjust-hue function do in Sass?

It changes the hue of a color by rotating it around the color wheel by a specified number of degrees.

beginner

How do you use adjust-hue to make a color 90 degrees more blue?

Use adjust-hue($color, 90deg) to rotate the hue 90 degrees on the color wheel, shifting the color towards blue.

intermediate

What happens if you pass a negative value to adjust-hue?

The hue rotates backward on the color wheel by that many degrees, shifting the color in the opposite direction.

intermediate

Example: adjust-hue(#ff0000, 120deg) results in which color?

It results in a green color because red rotated 120 degrees on the hue wheel moves to green.

beginner

Why is adjust-hue useful in web design?

It helps create color variations easily by shifting hues without manually picking new colors, keeping harmony in design.

What unit should you use with the adjust-hue function in Sass?

A Degrees (deg)

B Pixels (px)

C Percent (%)

D Em (em)

The adjust-hue function rotates the hue by degrees on the color wheel, so degrees (deg) is the correct unit.

If you want to make a color more yellow by rotating its hue, which value might you use?

A Adjust hue by +60deg

B Adjust hue by -60deg

C Adjust hue by +180deg

D Adjust hue by 0deg

Yellow is about 60 degrees from red on the hue wheel, so adding +60deg shifts the color towards yellow.

What color do you get if you adjust the hue of pure blue (#0000ff) by 180 degrees?

A Red

B Yellow

C Green

D Cyan

Rotating blue by 180 degrees on the hue wheel lands on yellow.

Which Sass function would you use to rotate a color's hue?

A lighten()

B darken()

C adjust-hue()

D saturate()

adjust-hue() is the function designed to rotate the hue of a color.

What happens if you use adjust-hue($color, 360deg)?

A Color becomes white

B Color becomes black

C Color becomes transparent

D Color stays the same

Rotating hue by 360 degrees brings the color back to its original hue.

Explain how the adjust-hue function works and give an example of when you might use it.

Think about how colors change when you move around the color wheel.

Describe the difference between using a positive and a negative value in adjust-hue.

Consider the direction you turn a wheel clockwise or counterclockwise.

Practice

1.

What does the adjust-hue function do in Sass?

easy

A. It adjusts the saturation of a color.

B. It changes the brightness of a color.

C. It rotates the hue of a color by a specified degree on the color wheel.

D. It converts a color to grayscale.

Solution

1. Step 1: Understand the purpose of adjust-hue

   The function changes the hue angle of a color, moving it around the color wheel.

2. Step 2: Compare with other color functions

   Brightness, grayscale, and saturation are different properties; adjust-hue specifically rotates hue.

3. Final Answer:

   It rotates the hue of a color by a specified degree on the color wheel. -> Option C

4. Quick Check:

   adjust-hue rotates hue = D [OK]

Hint: Remember: adjust-hue changes color angle, not brightness or saturation [OK]

Common Mistakes:

• Confusing hue rotation with brightness or saturation changes
• Thinking it converts colors to grayscale
• Assuming it changes color opacity

2.

Which of the following is the correct syntax to rotate the hue of #ff0000 by 90 degrees using adjust-hue in Sass?

?

easy

A. adjust-hue(#ff0000, 90deg)

B. adjust-hue(#ff0000, 90)

C. adjust-hue(#ff0000 90deg)

D. adjust-hue(#ff0000; 90deg)

Solution

1. Step 1: Check the function syntax

   adjust-hue takes two arguments separated by a comma: the color and the degree number (without unit).

2. Step 2: Identify correct argument format

   Degrees are passed as a number, not with deg unit in Sass.

3. Final Answer:

   adjust-hue(#ff0000, 90) -> Option B

4. Quick Check:

   Use number degrees without unit in adjust-hue = B [OK]

Hint: Use number only for degrees, no 'deg' unit in adjust-hue [OK]

Common Mistakes:

• Adding 'deg' unit to degree argument
• Missing comma between arguments
• Using semicolon instead of comma

3.

What color will be produced by this Sass code?

$color: #00ff00;
$new-color: adjust-hue($color, 120);

Choose the closest hex color output for $new-color.

medium

A. #ffff00

B. #ff0000

C. #00ffff

D. #0000ff

Solution

1. Step 1: Identify the original color hue

   #00ff00 is pure green, which is at 120° on the color wheel.

2. Step 2: Rotate hue by 120 degrees

   Adding 120° to green (120°) gives 240°, which is blue.

3. Step 3: Correct hue calculation

   Green is 120°, adding 120° gives 240°, which corresponds to blue (#0000ff).

4. Step 4: Re-examine options

   Since 120 + 120 = 240°, the color is blue (#0000ff), so #0000ff is correct.

5. Final Answer:

   #0000ff -> Option D

6. Quick Check:

   Green + 120° hue rotation = Blue = #0000ff [OK]

Hint: Add degrees to hue; green(120°) +120° = blue(240°) [OK]

Common Mistakes:

• Confusing hue degrees and resulting colors
• Not wrapping hue around 360 degrees
• Mixing RGB hex with hue values

4.

Identify the error in this Sass code snippet:

$base-color: #ff00ff;
$new-color: adjust-hue($base-color 60deg);

medium

A. Missing comma between arguments and incorrect degree unit.

B. Using an invalid color code.

C. adjust-hue cannot be used with variables.

D. The function requires three arguments.

Solution

1. Step 1: Check argument separation

   Arguments in adjust-hue must be separated by a comma; here, comma is missing.

2. Step 2: Check degree argument format

   Degrees should be passed as a number without deg unit in Sass.

3. Final Answer:

   Missing comma between arguments and incorrect degree unit. -> Option A

4. Quick Check:

   Comma and number-only degrees needed = C [OK]

Hint: Always separate args with comma and use number for degrees [OK]

Common Mistakes:

• Omitting comma between function arguments
• Adding 'deg' unit to degree argument
• Assuming adjust-hue needs three arguments

5.

You want to create a color palette by rotating the hue of #336699 by increments of 45 degrees four times. Which Sass code correctly generates the list of rotated colors?

?

hard

A. $base: #336699;
$palette: (
adjust-hue($base, 45),
adjust-hue($base, 90),
adjust-hue($base, 135),
adjust-hue($base, 180)
);

B. $base: #336699;
$palette: (
adjust-hue($base 45),
adjust-hue($base 90),
adjust-hue($base 135),
adjust-hue($base 180)
);

C. $base: #336699;
$palette: (
adjust-hue($base, 45deg),
adjust-hue($base, 90deg),
adjust-hue($base, 135deg),
adjust-hue($base, 180deg)
);

D. $base: #336699;
$palette: (
adjust-hue($base, 45),
adjust-hue($base, 90),
adjust-hue($base, 135),
adjust-hue($base, 225)
);

Solution

1. Step 1: Verify argument syntax for adjust-hue

   Degrees must be numbers without units and arguments separated by commas.

2. Step 2: Check the increments and values

   Rotations are 45, 90, 135, and 180 degrees, which are correct increments of 45.

3. Step 3: Compare options

   $base: #336699; $palette: ( adjust-hue($base, 45), adjust-hue($base, 90), adjust-hue($base, 135), adjust-hue($base, 180) ); uses correct syntax and increments. $base: #336699; $palette: ( adjust-hue($base 45), adjust-hue($base 90), adjust-hue($base 135), adjust-hue($base 180) ); misses commas. $base: #336699; $palette: ( adjust-hue($base, 45deg), adjust-hue($base, 90deg), adjust-hue($base, 135deg), adjust-hue($base, 180deg) ); uses invalid 'deg' units. $base: #336699; $palette: ( adjust-hue($base, 45), adjust-hue($base, 90), adjust-hue($base, 135), adjust-hue($base, 225) ); has wrong last increment (225 instead of 180).

4. Final Answer:

   code with correct syntax and increments -> Option A

5. Quick Check:

   Correct syntax + increments = A [OK]

Hint: Use commas and number degrees; check increments carefully [OK]

Common Mistakes:

• Using 'deg' units in degrees
• Missing commas between arguments
• Incorrect increment values in rotation