Schneider Optics PC-SUPER-ANGULON 28 mm f/2.8 User Manual
Page 6
6
Perspective Correction for Analog and Digital Photography
8
3
1
0,7
0,5
0,4
0,35
m
oo
5,6
11
4
16
2,8
22
22
48
4
8
16
16
22
5
3
2
1,5
1,25
Horizon
Too much
foreground
Optical axis
Building is true to scale
but cropped on top
8
3
1
0,7
0,5
0,4
0,35
m
oo
5,6
11
4
16
2,8
22
22
48
4
8
16
16
22
5
3
2
1,5
1,25
Horizon
Optical axis
Building not true to scale,
vertically compressed
Converging lines
≈ ¡3°
The equalizing of converging lines or of unfavorable perspective due to a
camera location made necessary by obstacles, reflections or danger, e .g .
traffic, is not only interesting for conventional analog photography, but also
for digital photography when higher quality demands are made . While digi-
tal images or digitized (scanned) analog images can be equalized on the
computer using image editing software such as Photoshop, this is, however,
associated with substantial degrading: If the rectangular image is distorted
in the manner of a trapezoid for the parallel alignment of the converging
lines, the interpolation (recalculation of the pixels) required for this reduc-