Pixels to Pictures
Introduction 3 steps 1 pixel Hexadecimal Red-Green-Blue Colors from 0-255 17 million colors More pixels = better Two parts of a file Overview Options Pixel positions Pixel values Brightness Brightness example Contrast Contrast example Color Color example ND grad Sharpen Blur Acquiring an image Scanners Scanner specs Resolution Bit depth & DMAX Other Digital cameras Sensor types Digicam pixels Four into one Interpolation More sensors Print size Output What is resolution? Dots vs. pixels Printer resolution Output resolution Print size 2
Introduction 3 steps 1 pixel Hexadecimal Red-Green-Blue Colors from 0-255 17 million colors More pixels = better Two parts of a file Overview Options Pixel positions Pixel values Brightness Brightness example Contrast Contrast example Color Color example ND grad Sharpen Blur Acquiring an image Scanners Scanner specs Resolution Bit depth & DMAX Other Digital cameras Sensor types Digicam pixels Four into one Interpolation More sensors Print size Output What is resolution? Dots vs. pixels Printer resolution Output resolution Print size 2
Enlarging
Formats Conclusion Links Software
What About Making Images larger?
Adding more pixels: something for nothing?
Changing the output resolution with resampling turned ON can turn a 3 megapixel image into a 5 megapixel image.
| Interpolation: | |
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| Expand image by spreading out existing pixels |  |
| Fill in new pixels with intermediate color values |  |
...but interpolation may produce unsatisfactory results for significant size increases.
Resizing this way is fine for making images smaller, as may be necessary for web use or sending by email, but the best way to get a significant increase in size is by using specialized software like Genuine Fractals that uses much more complex mathematical processes than interpolation.
