User Guide

241
Working with Ou
tput
E
For Charts Only, select the export format, and click Chart Size.
JPEG Chart E
xport Options
Color Depth
.
JPEG charts can be exported as true color (24 bit) or 256 grayscale.
Color S pace. Color Space refers to the way that colors are encoded in the image. The
YUV color model is one form of color encoding, commonly used for digital video
and MPEG tra
nsmission. The acronym stands for Y-signal, U-Signal, V-signal.
The Y component specifies grayscale or luminance, and the U and V components
correspond to the chrominance (color information).
The ratios
represent the sampling rates for each component. Reducing the U and V
sampling rates reduces file size (and also quality). Color Space determines the degree
of “lossiness” for colors in the exported image. YUV 4:4:4 is lossless, while YUV
4:2:2 and Y
UV 4:1:1 represent the decreasing trade-off between file size (disk space)
and quality of the colors represented.
Progressive encoding. Enables the image to load in stages, initially displaying at low
resoluti
on and then increasing in quality as the image continues to load.
Compression Quality Setting. Controls the ratio of compression to image quality. The
higher the image quality, the larger the exported file size.
Color Ope
rations.
The following operations are available:
 Invert.
Each pixel is saved as the inverse of the original color.
 Gamma co
rrection.
Adjusts the intensity of colors in the exported chart by
changing the gamma constant that is used to map the intensity values. Basically,
it can be used to lighten or darken the bitmapped image. The value can range
from 0.1
0 (darkest) to 6.5 (lightest).
BMP and PICT Chart Export Options
Color Depth. Determines the number of colors in the exported chart. A chart saved
under an
y depth will have a minimum of the number of colors actually used and a
maximum of the number of colors allowed by the depth. For example, if the chart
contains three colors—red, white, and black—and you save it as 16 colors, the chart
will re
main as three colors.