Image Processing Reference
In-Depth Information
TABLE 6.14
Result of Downsampling
x
y
z
f
0
0
0
0.1
0
0
0.75
0.1
0
0
1
0.1
0
0.5
0
0.594
0
0.5
0.75
0.594
0
0.5
1
0.594
0
1
0
1.6
0
1
0.75
1.6
0
1
1
1.6
0.5
0
0
0.85
0.5
0
0.75
1.008
0.5
0
1
1.35
0.5
0.5
0
1.594
0.5
0.5
0.75
1.753
0.5
0.5
1
2.094
0.5
1
0
2.85
0.5
1
0.75
3.008
0.5
1
1
3.35
1
0
0
2.1
1
0
0.75
2.416
1
0
1
3.1
1
0.5
0
3.094
1
0.5
0.75
3.411
1
0.5
1
4.094
1
1
0
4.60
1
1
0.75
4.916
1
1
1
5.6
Example 6.12
Figure 6.21 depicts a chain of events typical for a printing system image path. The
input image is in a device-dependent color space such as sRGB. For the present
purpose, we will assume it is a standard 24-bit color image that is transformed (T
1
)
[12] to reference output medium metric ROMMRGB. Color space ROMMRGB has
been developed by Eastman Kodak Company as a standard color space for the
storage and manipulation of digital images. Note that the transformations from
sRGB to ROMMRGB and back to sRGB are nonlinear. Transformation T
2
moves
the image from ROMMRGB to the device-independent color space L*a*b*. The
results of the simulation for a 512
512 Lena image using a Xerox Phasor 770
digital printer are shown in Table 6.16.
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