IL3 User’s Guide
page 38
11S-3002B
•
Live images seen on the display ALWAYS go through the image
processor.
User Control of Image Processor
•
Bayer (Color) processing (color cameras only) is done in order to
display a color image. The user may elect to save images that have
not gone through Bayer colorization by choosing to download a
RAW format (See “4-13 Saving Images to Mass Storage”.)
•
Color Correction is controlled via “White Balance” in the Display
tab. You may choose from several color temperatures: Daylight
(5600K), Tungsten (3200K), and Fluorescent (4100K) and Normal
setting 1:1:1 (all channels at nominal gain). There is also a “Custom”
setting used to white balance using a gray target and an RGB gain
dialog for further manual adjustment. See “4-12 Custom Color
Correction”.
•
Brightness and Contrast are controlled via sliders and spinners.
Users select levels from -100 to +100 (default = 0).
•
Gamma is also adjusted in this dialog. Levels range from 0.20 to
5.00. Gamma 2.2 is the default as it is the most common display gamma for monitors. For a linear
display choose a gamma of 1.00.
Note: Making a selection from this menu only affects the Displayed image and any (non RAW) images
saved to mass storage devices. It does not affect the either the 8-bit or 10-bit images as they are
recorded into the IL3’s high-speed internal memory.
Adjustments made here may be done before
and/or after the imagery is captured.
Note: All image processing is done using 16-bit math. If 8 bits are recorded, they will be used as the
upper 8 bits of the 16-bit calculations by the image processor. The upper 8 bits of the results are
then used as an output. Similarly, if 10 bits are recorded, they will be used as the upper 10 bits of
the 16-bit calculations. This is true regardless of the output bit depth, thus the lower two bits of the
10 bits recorded are used when computing color corrections and image adjustments, even if you
are viewing or downloading 8/24-bit formats.
4-12 Custom Color Correction
When the preset White Balance options, Daylight, Tungsten, and Fluorescent, do not give you the
color reproduction you need, there are a couple of other options available:
The Custom item in the Display/White Balance menu allows you to set the color correction via a gray
card or neutral gray object.
To use Custom White Balance
:
1. Click on the “Custom” button in the White Balance menu. A rectangular reticle will appear in the
middle of the image window and a special histogram will appear (See “Figure 4-20: Custom White
Balance” on page 39.)
2. Center the reticle (the white box in the center of the image) on a neutral gray object in the field
of view. In this instance we are using an 18% gray card, which is the recommended target. Most
often the card will only fill a portion of the field of view--it only needs to fill the reticle. It is
important that the card, or other neutral gray object is located close to the objects of interest and
is exposed to the same light as the objects you are going to image.
3. Adjust the lens aperture so that the histogram shows the pixel values grouped high (to the right
Figure 4-19:
Display Settings
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