Worksheet Solutions: Getting Started with Image Editing | Image Editing for Beginners - Class 8 PDF Download

Multiple Choice Questions (5 points each)

Q1: What are pixels in a digital image?
Ans: (b)
Pixels are the smallest units of a digital image. They can be thought of as tiny squares, each containing a specific color. When you view an image on a computer screen, you're actually looking at thousands of these tiny squares, which together create the entire image.

Q2: Which image orientation is taller than it is wide?
Ans: (b)
In image terminology, "portrait" orientation refers to images that are taller (vertical) than they are wide (horizontal). This orientation is commonly used for photographs of people.

Q3: What does image resolution refer to?
Ans: (c)
Image resolution is a measure of the amount of detail present in an image. A higher resolution image has more detail and can be printed or enlarged without a noticeable loss of quality.

Q4: Which image file format is known for its lossless compression?
Ans: (b)
PNG (Portable Network Graphics) is a file format known for its lossless compression. It retains all the image data without sacrificing quality, making it suitable for images where preserving detail is crucial.

Q5: Why is it recommended to keep an original unedited version of an image when making changes?
Ans: (b) To prevent image degradation
Keeping an original unedited version of an image is important to avoid image degradation. When you edit an image, especially if you use lossy compression or make multiple edits, you can lose quality and detail over time. The original serves as a backup in case you need to revert to the unedited version.

True/False Questions (2 points each)

Q1: Lossy compression removes some information from an image to reduce the file size.
Ans: True
This statement is true. Lossy compression intentionally removes some image information to reduce the file size, which can result in a loss of image quality.

Q2: JPEG is commonly used for graphics and illustrations.
Ans: False This statement is false. JPEG (Joint Photographic Experts Group) is commonly used for photographs due to its lossy compression. Graphics and illustrations are typically better suited for formats like PNG, which uses lossless compression.

Q3: Image degradation is a problem primarily for uncompressed image formats.
Ans: False
This statement is false. Image degradation can occur in both compressed (especially lossy compression) and uncompressed image formats when an image is repeatedly edited or saved at lower quality settings.

Q4: The higher the resolution of an image, the more quality it will have.
Ans: True
This statement is true. Higher resolution images contain more detail and generally have higher quality. This is important for tasks like printing or displaying images on larger screens.

Q5: Dimensions refer to the physical size of an image.
Ans: False
This statement is false. Dimensions in the context of digital images refer to the width and height of the image in pixels, not its physical size. Physical size is determined by factors like print size and pixel density.

Short Answer Questions (5 points each)

Q1: Explain the difference between lossy and lossless compression in image file formats.
Ans: Lossy compression removes some image information to reduce file size but may result in a loss of quality. Lossless compression retains all image data while achieving a smaller file size without quality loss.

Q2: Name two common image file formats and briefly describe their typical uses.
Ans: Two common image file formats are:

• JPEG: Typically used for photographs, it employs lossy compression and provides a good balance between quality and file size.
• PNG: Commonly used for graphics and illustrations, it uses lossless compression, resulting in higher quality but larger file sizes.

Q3: Why is it important to understand an image's resolution when considering printing or resizing?
Ans: Understanding image resolution is important because it determines the level of detail in an image. Higher resolution images are suitable for larger prints or resizing without quality loss, while lower resolution images may appear pixelated when enlarged.

Q4: Describe what happens to an image when it is resized to a larger dimension than its original size.
Ans: When an image is resized to a larger dimension than its original size, it often loses quality and becomes blurry. This occurs because the software has to interpolate and create new pixels, which may not have the same level of detail as the original.

Q5: What precautions can you take to avoid image degradation when editing image files?
Ans: To avoid image degradation when editing image files, you can:

• Keep an original unedited version of the image as a backup.
• Use formats with lossless compression when possible.
• Make non-destructive edits using layers or copies.
• Save edited images in a high-quality format.
• Avoid excessive compression or making too many repeated edits, especially with lossy compression formats like JPEG.