Understanding Image Resolution and Quality

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Questions and Answers

What is resolution used to judge in an image?

The quality of the image

What does increasing size without increasing resolution do to the image?

Stretches out the dots of color

What should happen to resolution when you enlarge an image?

Resolution should decrease

What happens when you scan at a high resolution?

The loss won’t be as severe Signup and view all the answers

What changes when you change the print size of an image?

The resolution changes as well Signup and view all the answers

What changes when you change the print size but not the number of pixels?

The resolution changes Signup and view all the answers

What is the purpose of re-freshing data every 5 years?

To ensure data remains up-to-date and relevant. Signup and view all the answers

Which image format is considered suitable for archiving?

DNG (Digital Negative) Signup and view all the answers

What is the best image format for the internet?

JPEG (Joint Photographic Experts Group) Signup and view all the answers

What is the main advantage of using TIFF (Tagged Image File Format) for digital archiving?

It is a common and high-quality format suitable for archiving. Signup and view all the answers

Explain the significance of resolution in an image.

Resolution is the ratio of pixels to the print size, determining image quality. Signup and view all the answers

What does higher resolution imply in terms of pixel dimensions?

Higher resolution means a larger number of pixels. Signup and view all the answers

Explain the relationship between print size and resolution when it comes to file size.

Print size and resolution are inversely related to file size. Signup and view all the answers

What is the impact of resampling on the number of pixels and file size?

Resampling can change the number of pixels, thereby affecting the file size. Signup and view all the answers

How does resampling affect the relationship between print size, number of pixels, and resolution?

Resampling breaks the relationship between print size, number of pixels, and resolution. Signup and view all the answers

Define what pixels are made of and how they determine the color palette.

Pixels are a series of 0s and 1s that signify directions for different colors. Each 0 or 1 is called a 'bit', and the number of bits in a pixel determines the color palette. Signup and view all the answers

Explain the concept of '16-bit' in relation to color palettes and painting with pixels.

'16-bit' refers to the number of bits in each pixel, which determines the color palette available for painting with pixels. Signup and view all the answers

What is the effect of changing pixel dimensions on file size and resolution?

Changing pixel dimensions can alter file size but may not affect resolution. Signup and view all the answers

Study Notes

Image Resolution and Quality

Image resolution is measured in pixels (or dots) per inch (ppi) and is used to judge the quality of the image.
Increasing the size of an image without increasing the resolution stretches out the dots of color, reducing the image quality.

The Relationship Between Resolution and Print Size

Resolution and print size are inversely related, meaning that when one increases, the other decreases.
Changing the document size alone does not change the pixel dimensions or file size, but changing the print size changes the resolution.
The number of pixels remains the same, but the print size of them changes.

Resampling

Resampling can change the number of pixels, which can therefore change the file size.
Resampling breaks the relationship between the variables (print size, number of pixels, or resolution) independently of each other.
It always results in a file size change because pixels are added or taken away.

Pixels and Bits

Pixels are a string of code (a series of 0s or 1s) that signify directions for different colors.
Each 0 or 1 is called a "bit".
The number of bits in the pixel determines the color palette.

Image Storage Formats

RAW formats are proprietary and not suitable for archiving, and should be converted to DNG.
DNG (Digital Negative) is an open standard for RAW format images, suitable for archiving.
TIFF (Tagged Image File Format) is a common and best format for digital archiving.
JPEG (Joint Photographic Experts Group) is best for internet use, but not suitable for archival images due to lossy compression.
JPEG 2000 can use lossless compression, but its archival qualities are still unclear due to copyright issues.

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Description

This quiz covers the concept of image resolution, its importance in judging image quality, and how increasing image size without increasing resolution can affect the visual appearance. Topics include pixels per inch (ppi), dpi measurements, and the impact on image file size.