Brightness and Contrast - GIMP Beginners' Guide E132 Video Lecture | A GIMP 2.8 Tutorial for Beginners - Design Softwares

hi in this tutorial I continue with the
next color to brightness and contrast
the presets here are settings that we
already discussed in previous videos
this one here edit d settings as levels
you can enter the settings as levels and
that i'm going to talk about this tool
this is another color tool levels and
i'll talk about one of the next
tutorials and of course brightness we
can decrease that make the image darker
increase it to make it brighter you can
adjust the contrast and as you see there
isn't anything complicated here or
anything much that i can show you about
these settings that's why i'm going to
talk about this contrast what exactly it
does a little bit of science behind this
which might be interesting to you the
first thing i want to show you is grab
the color picker here and select any
color on the image i'm going to open the
color selection dialog and you see here
that we have six different sliders for
the hue saturation value amount of red
green and blue in the image and the
combination of all these gives us
millions of colors now if i go back to
the brightness and contrast to and
increase the contrast all the way to 127
now click OK here and I'm going to bring
out another color to hue/saturation here
and notice which are our primary colors
red yellow green light blue cyan blue
magenta and all of these colors and
black and white are now found in this
image and no other colors are here so by
increasing the contrast we are losing
colors and if we go all the way here
like I did here we can end up with
maximum of eight
colors which are the primary colors and
black and white so what this contrast
setting does is let's say it takes all
the different variations of green and
bring them towards this pure green color
in if I close this now and use the color
picker to sample this color you see that
it's exactly in the middle here on the
top pure green color if I sample the
yellow you see is the same thing now you
may be wondering what becomes black and
what becomes right let's see that if I
sample this area here you see that this
is very close to the pure black color
here and if I simple somewhere around
here you see that this color is very
close to the pure white car that's why
when we increase the contrast it becomes
white now if we decrease the contrast
all the way down I'm going to click OK
here and again we use the color picker
to sample this you see that now we have
pure gray color exactly in the middle
here between the pure white and black
it's can select and do so by increasing
the contrast we are losing variations of
colors and bringing all the colors
towards the primary colors and always
hear that this makes the image look like
more clear more detailed but you have to
be careful using this setting and if you
do use very small numbers here so that's
it for this trio like the video
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