[UserStory] fix code style errors in ImageLab.java

[robo-jones]

User Story

Essential components

• Title describes the story
• Stakeholder type is identified
• Outcome is described
• Rationale is explicit
• Acceptance criteria are verifiable and from the perspective of the stakeholder

Story

As a maintainer
I want the code in ImageLab.java to adhere to the syntactic style conventions of the project
so that the project code has a consistent style that facilitates maintainability.

Supporting Information

There are encapsulation errors appearing in the Checkstyle report that require refactoring. This issue intentionally ignores such errors. Note also that comments matching 'TODO' are reported by Checkstyle but are not coding convention violations.

Dependencies

Issues #32 and #33 depend on this user story

Acceptance Criteria

Checkstyle reports only those errors in ImageLab.java that are related to encapsulation or information hiding (e.g., "must be private and have accessor methods").