s kills : rotate, select, crop, resize, change contrast, filter, compress
DESCRIPTION
An image processing session. S kills : rotate, select, crop, resize, change contrast, filter, compress C oncepts : image processing operation, information . This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. . Where does this topic fit?. - PowerPoint PPT PresentationTRANSCRIPT
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Skills: rotate, select, crop, resize, change contrast, filter, compressConcepts: image processing operation, information
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.
An image processing session
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Where does this topic fit?
• Internet concepts– Applications– Technology– Implications
• Internet skills– Application development– Content creation (image)– User skills
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Selected image processing operations
• Rotate an image • Crop an image• Change image contrast• Apply a filter to an image• Resize an image• Select a portion of an image
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Start with a picture of Lucas
2,048 by 1,536 pixels (zoom out to fit laptop screen)
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Operation: rotate
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Operation: crop
357 by 381 pixel image (shown full size)
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Operation: adjust contrast
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Operation: apply the “ink sketch” filter
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Operation: resize
200 by 213 pixels
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Operation: crop
200 by 200 pixels
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Tool option and status areas
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15.3 kilobytes40.2 kilobytes
Operation: compress
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Image processing work flow
Capture
Edit
Compress
Distribute
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Try this for yourself
The original picture of Lucas is at:
http://som.csudh.edu/fac/lpress/netApps/image/lucasoriginal.jpg
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Zooming versus resizing
2,048 by 1,536 pixels (3 megapixels)
1,920 by 1,200 pixels
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Summary
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Resources
Tutorials:http://www.getpaint.net/doc/latest/index.html
Download, forums, blog and email contact:http://www.getpaint.net/doc/latest/WebLinks.html
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1. We illustrated several image processing operations in this presentation. Without looking back, do you recall what they were?
2. Can you describe what each does to an image?3. Can you think of any other image processing operations that we did not use in
this presentation?4. If one zooms in on an image is information lost or gained?5. If one resizes an image, making it smaller, is information lost?6. If one resizes an image, making it larger, is information gained?7. If one crops an image, is information lost?8. If one filters an image, is information lost?9. If one compresses an image, is information lost?10. If one zooms in on an image, which of its characteristics are changed?11. If one resizes an image, which of its characteristics are changed?12. If one crops and image, which of its characteristics are changed?13. If one filters an image, which of its characteristics are changed? 14. If one rotates an image, which of its characteristics are changed?15. If one compresses an image, which of its characteristics are changed?
Self-study questions