There are some specific terms which are widely used in image resolution .We need to know the meaning of them.Some of them are explained below:-
DPI(Dots per Inch):-Dots per inch is measure of spatial printing or video dot intensity.Simply the no of individual dots placed in a line within the span of one inch. Basically DPI refers to the output resolution of a printer or image setter.DPI refers to the physical dot density of an image when it is reproduced as a real physical intensity.
PPI(Pixel per inch):-It is also called pixel density.It is a measurement of the resolution of devices of various context typically in computer displays,image scanners ,digital camera ,image sensors etc.
Calculation of PPI for monitor:-
PPI=Dp/Di
Where Dp=diagonal resolution in the image
Di=diagonal size in inches
Dp is calculated from following formula:-\
where Wp is width resolution in pixels
Hp is height resolution in pixels
Dots Per Pixel:-Dots per pixel is an unit of image resolution which describes the no of dots available in per pixel.In RGB color space there is 3 dots per inch.
Dots Per Centimeter:- Dots per centimeter or dpcm is a unit of resolution used as metric alternative to Dpi .It is used in CSS3 media queries among other standards.
Lines Per Inches:- Lines per inch is a unit of printing resolution in systems that uses a halftone screen.It is a measure of how close together the lines in a halftone grid are.High value of LPI shows greater detail & sharpness.
Samples Per Inch:- Samples per inch(SPI) is a measurement of the resolution of image scanners.in particular the no of individual samples that are taken in the space of one linear inch.The high value of SPI indicates more detailed its reproduction of scanned object.
Pixel Pitch:-A linear measurement of approximate width of one pixel is known as pixel pitch.In Other words center to center distance between individual pixel in micrometer is called pixel pitch.
DPI(Dots per Inch):-Dots per inch is measure of spatial printing or video dot intensity.Simply the no of individual dots placed in a line within the span of one inch. Basically DPI refers to the output resolution of a printer or image setter.DPI refers to the physical dot density of an image when it is reproduced as a real physical intensity.
PPI(Pixel per inch):-It is also called pixel density.It is a measurement of the resolution of devices of various context typically in computer displays,image scanners ,digital camera ,image sensors etc.
Calculation of PPI for monitor:-
PPI=Dp/Di
Where Dp=diagonal resolution in the image
Di=diagonal size in inches
Dp is calculated from following formula:-\
where Wp is width resolution in pixels
Hp is height resolution in pixels
Dots Per Pixel:-Dots per pixel is an unit of image resolution which describes the no of dots available in per pixel.In RGB color space there is 3 dots per inch.
Dots Per Centimeter:- Dots per centimeter or dpcm is a unit of resolution used as metric alternative to Dpi .It is used in CSS3 media queries among other standards.
Lines Per Inches:- Lines per inch is a unit of printing resolution in systems that uses a halftone screen.It is a measure of how close together the lines in a halftone grid are.High value of LPI shows greater detail & sharpness.
Samples Per Inch:- Samples per inch(SPI) is a measurement of the resolution of image scanners.in particular the no of individual samples that are taken in the space of one linear inch.The high value of SPI indicates more detailed its reproduction of scanned object.
Pixel Pitch:-A linear measurement of approximate width of one pixel is known as pixel pitch.In Other words center to center distance between individual pixel in micrometer is called pixel pitch.
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