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The Photographer's Digital Workshop

5/19/97

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Image resolution is the amount of image detail saved in the file.

Similar to photo resolution, where the finer the grain the higher the resolution possible.

The unit of photo digital resolution is the Pixel (Picture Element)

Resolution is generally measured in Pixels per Inch.

Double the size is over 4 times the pixels
Size in Inches	Resolution (pixels per inch)	RGB File Size	CMYK File Size
1 x 1	100 ppi	30 k	40 k
2 x 2	100 ppi	118 k	157 k
CMYK adds an additional 33% to the file size

Standard display on computer monitor is 72 ppi.

Sometimes, Dots per Inch (dpi) is used interchangeably, but it's more of a measure of output resolution where devices have fixed dot sizes.

A Pixel, on the other hand, can be any size.

Bit depth, as in 24 bits/pixel, is the amount of information about the Pixel. It's color, location

Generally, for press work 300 ppi is good.

Some standard file sizes for standard offset print production
Size in Inches	Resolution (pixels per inch)	RGB File Size	CMYK File Size
4 x 5	300 ppi	5.15 MB	6.87 MB
5 x 7	300 ppi	9.01 MB	12 MB
8 x 10	300 ppi	20.6 MB	27.5 MB
11 x 14	300 ppi	39.7 MB	52.9 MB
16 x 20	300 ppi	82.4 MB	109.9 MB

In photo, it varies with the final magnification, original image detail, and final viewing distance. It is entirely subjective, just like 35mm vs. Medium or large format preferences

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