When changing only the color of an object, what must be ensured to maintain accessibility?

Maintaining accessibility when altering the color of an object is critical, and ensuring adequate color contrast is primary in this regard. Color contrast refers to the difference in luminance or color that makes an object distinguishable from its background. For individuals with visual impairments or color blindness, adequate contrast ensures that information is perceivable and recognizable.

By following sufficient contrast guidelines, which often recommend a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text, designers enhance the usability of visual content. This practice not only supports those with color vision deficiencies but also benefits all users by improving overall readability and visual clarity.

The other options, while possibly relevant in certain design contexts, do not address the specific requirement of maintaining accessibility through color changes. Bold text, symmetry in design, or increasing font size do not directly contribute to the effectiveness of color contrast, making them less relevant for this particular aspect of accessibility.