HIGHLIGHTING A COLOR
COMPOSITION
To highlight an image,
like the one presented in Display 2, we need to change (highlight) the
contrast over the original images.
Notice that there is a
chart that shows a histogram, which defines the number of points with the
same color intensity in the image. The color intensity, named gray level, can
take values from 0 to 255, creating a "degrade", as presented in
the bar below the histogram. Slide the cursor over the histogram and
notice the variation in the Input Level.
Notice that the image got
a kind of reddish color. Looking at the output histogram, shown in the chart
area, we notice that this histogram shows a higher number of points where the
red color intensity is higher, closer to the 255 value in gray level. Even
more, you can check that the output histogram has a better distribution over
all gray levels, this fact will help to increase the image contrast. ·
execute the
same procedure for the Blue and Green colors. Notice that the
histograms are different and the maximum and minimum values will be
different. The final result is close to the image presented in Canvas 2. ·
click on Execute
and Reset, to change the contrast back to its original values
before going to the next tasks. Change the band color
association for each band in the same way that we did to visualize the
current image.
This color combination is
one of the most frequently used. |