Resolution
is comprised of two components: "Line Resolution" (Spatial)
and shades of "Brightness"(Bit Depth). Generally, when
we talk about "how sharp" a print is, we are talking about
"Spatial" resolution. Often discussed in"dpi",
in the digital world it is PPI [Pixels-Per-Inch]... there are NO
"dots" digital! However, the number of colors (Bit Depth)
can effects our acceptance of a photograph "sharpness".
Line
Resolution is expressed in rows and columns of pixel
(picture elements). e.g. 600x800; 2000x3000; etc. Many common computer
screen resolutions have standard names.
|
Columns
|
Rows
|
Name
|
|
640
|
480
|
VGA
|
|
800
|
600
|
SVGA
|
|
1024
|
768
|
XGA
|
|
1280
|
1024
|
SXVGA
|
|
1600
|
1200
|
UXVGA
|
|
2000
|
1600
|
SUXGA
|
|
2560
|
2048
|
QSXGA
|
|
3200
|
2400
|
QUXGA
|
Color
Resolution
is expressed in bit depths: "1bit", "8bit",
"24bit", etc. These bit depths are the exponent of two
or 2 raised to the x power. The common color depths have standard
names:
|
Color
Depth
|
Name
|
Power
of 2
|
Number
of Colors
|
|
1
bit
|
Binary
|
1
|
2
|
|
8
bit
|
Index
|
8
|
[2x2x2x2x2x2x2x2]
= 256
|
|
16
bit
|
Hi
Color
32 x 32
x 32
32,768 [Thousands]
|
5
[5R-5G-5B-1T]
|
[2x2x2x2x2x2x2x2] = 32
[2x2x2x2x2x2x2x2]
= 32
[2x2x2x2x2x2x2x2]
= 32
|
|
24
bit
|
True
Color
256 x
256 x 256
16 [Millions]
|
8
[8R-8G-8B]
|
[2x2x2x2x2x2x2x2x2x2x2]
= 256
[2x2x2x2x2x2x2x2x2x2x2]
= 256
[2x2x2x2x2x2x2x2x2x2x2]
= 256
|
|
30
bit
|
30
bit
1000 x 1000
x 1000
1 [Billions]
|
10
[10R-10G-10B]
|
[2x2x2x2x2x2x2x2x2x2x2x2x2]
= 1000
[2x2x2x2x2x2x2x2x2x2x2x2x2]
= 1000
[2x2x2x2x2x2x2x2x2x2x2x2x2]
= 1000
|
|
48
bit
|
48
bit
65536 x 65536
x 65536
281.5 [Trillions]
|
16
[16R-16G-16B]
|
[2
to the 16th power] = 65,536
[2
to the 16th power] = 65,536
[2
to the 16th power] = 65,536
|
Standard
Resolution:
There are no "standard" file sizes but digital file resolution
is defined by both "line" (spatial) and "brighness"
(depth) resolution. |
Revision
2.0
|
