Mikrotron eosens TS3, User Manual, Page: 43 / 120

page 34
4-16: Custom White Balance”
on page 34.)
2. Center the reticle (the whi t e
box in the center of the
image) on a neutral gray
object in the field of vi e w. In
this instance we are using an
18% gray card, which is the
recommended target. Most
oft en the card will only fill
portion of the field of v ie w--it
only needs to fill the r eticle
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
side of the box), but not saturated. It is important that the high pixel value is less than 255. Notic
on the example here, that the RGB peaks are not well aligned and that the Blue peak is farthest to
the left. This means th a t the color is skewed slightly towards the yellow, the complement to blue.
Note: The histogram used with Custom White Balance represents only the area of the reticle, not the
whole image.
Note: For more information
r egarding TS3 Histograms please refer to “Application No e
1: Histograms” on page 93.
4. Press the Trigger bu
tt on. You will immediately notice an di ff erence in the color.
Using RGB Gain Controls
Another option f or addressing color
correction is via R GB Gains. It is
recommended that you use the RGB gains
sparingly and as a final “t
w eak” to make
subtle changes to the color. The best use
of this is to get the color as close as
possible using the White Balance presets
or Custom options b
e fore adjusting the
RGB gains.
To use RGB Gain:
1. Navigate to the Display/RGB Gain
menu and open the dialog box.
2. For any color gain you wish to increase, move the slider to the desired position. R emember to use
the D-Pad for fine adju s tment.
Note: Remember that in the Bayer pa tt ern, 1/2 of the pixels are green, 1/4 are blue and 1/4 are red.
Whenever you change gain values you will be adding some noise to the image. It is best to avoid using
any more gain than you need to, and to take special care with the green channel as it represents half
of the pixels in the image.
Figure 4-17: RGB Control Dialog
Figure 4-16: Custom White Balance
T3 User Manual