Skills: none Concepts: information, information in an image This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

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Presentation transcript:

Skills: none Concepts: information, information in an image This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. How much information in an image?

Where does this topic fit? Internet concepts – Applications – Technology – Implications Internet skills – Application development – Content creation – User skills

Does cropping discard information? 350 by 466 = 163,100 pixels 100 by 100 = 10,000 pixels

Does reducing size discard information? 199 by 255 = 50,745 pixels 350 by 466 = 163,100 pixels

More pixels → more information

Does increasing size increase information? 199 by 255 = 50,745 pixels 350 by 466 = 163,100 pixels

Resize, decrease size

Resize, increase size

An extreme example 250 by 250 = 62,500 pixels 1 pixel

600 by ,000 pixels Information requires variety.

More pixels → more information More color variety → more information

256 colors 2 colors4 colors8 colors16 colors 64 colors 128 colors 32 colors Less color variety → less information

Google study – the big picture 65%

Lossy versus lossless compression Emp. #Name Hourly rate Hours worked Gross pay 1Robinson, Jackie1040$400 2Ladd, Alan1240$480 3Douglas, Kirk5440$2,160 4Dean, James3440$1,360 5Gable, Clark1240$480 6Davis, Bette3440$1,360 7Monroe, Marylyn7640$3,040 8Williams, Ted4640$1,840 9Ruth, George4940$1,960 10Merman, Ethyl2140$840

Summary More pixels → more information More color variety → more information

Self-study questions I took two pictures of Lucas on the balcony with a bicycle and sneakers. For one I had the camera set to low quality mode – 1 million pixels and the second it was set to high quality mode – 5 million pixels. Which picture had more information? If I cropped both to show just Lucas’ face, which would look sharper? If I cropped both to show just Lucas’ face, which would have more information? If I cropped a 200 by 200 pixel portion of each, which would show more of his face? If I project an image on a large screen like the one in a classroom or auditorium, have I added information? If I use my image processing program to zoom in on a portion of the image, have I added information? In lossless compression, data is discarded – the compressed file has fewer bits than the original. How is that possible? What had to be changed to make it possible? (Hint: see this presentation: