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
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
When is a Pixel Not a Pixel?
Digital cameras' definition of "pixel"
Remember earlier when we noted that "pixel" has a slightly different meaning in a digital camera than in a computer?
Representation of a digital camera's sensor:
(This is not what a CCD actually looks like.)
• Each CCD pixel is sensitive only to light of one color; red, green or blue.
• Each pixel can record different intensities of light, but only for one color.
• This arrangement is called a Bayer matrix.
