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Screen and Image Resolution

2.01 Investigate graphic image design. Screen and Image Resolution. Types of Images. Clip Art – premade graphics that are available online and in many software packages; may be vector or raster. Photographs – raster images that contain millions of colors.

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Screen and Image Resolution

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  1. 2.01 Investigate graphic image design. Screen and Image Resolution

  2. Types of Images • Clip Art – premade graphics that are available online and in many software packages; may be vector or raster. • Photographs – raster images that contain millions of colors. • Art Work – computer created drawings or paintings; may be raster or vector. Which type of image is appropriate? • Select images that reflect the purpose and theme of the document. • Use images to convey meaning and communicate, not to decorate. 1.02 Investigate image editing.

  3. The quality of an image is dependent upon two factors: • Resolution • Aspect Ratio 1.02 Investigate image editing.

  4. Image Resolution • Measured in PPI, or pixels per inch. • PPI is the numbers of pixels contained in one inch. • The higher the PPI, the better the quality. • The higher the PPI, the larger the file size. • Match the quality to the delivery method. • Most monitors can only display 72 PPI, so images that will be displayed on a monitor do not need a higher PPI. • Printers can print in much more detail so printed images need to contain more pixels per inch.

  5. Types of Resolution • PPI – pixels per inch • The number of pixels in an image. • DPI – dots per inch printed by a printer. • Dots of ink or toner in a printed image • The lower the DPI of a printer, the less detailed the image will be. • 150 PPI is sufficient for most personal desktop printers. • 300 PPI is better for high-quality images printed on more sophisticated printers. 1.02 Investigate image editing.

  6. Monitor Resolution • Also measured in PPI. • Refers to the number of pixels per inch displayed on a monitor. • The higher the resolution, the higher the level of detail • As resolution is increased on the monitor, detail is emphasized and image size is reduced 1024x768 Industry Standard 640x480 1.02 Investigate image editing.

  7. Aspect Ratio What’s the answer? An original image that is 1”x 1” has a resolution of 100 PPI What is the effect on the resolution of enlarging the image to 2”x 2”? What happens to the image quality? • Aspect Ratio – relationship of an object’s width to its height 1.02 Investigate image editing.

  8. Resizing a Raster Image • A small image that is enlarged is easily distorted. • Pixels are not added, just enlarged • Better to start with a large image and make it smaller • File size will remain the same • An image must be edited to reduce file size. 1.02 Investigate image editing.

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