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We are at Photoshop
and we will open the final frames
that we saved as tiff at Maxim DL.
We press ''File'' and ''Open'' and we choose our frames.
We see that all of them are dark.
That's why we will highlight the information.
We go at ''Image'', ''Adjustments'' and ''Levels''.
We can see at the histogram that,
the information is completely left.
We limit with the arrow
the information and press ''OK''.
We can see that the nebula starts to show up.
We go again at ''Levels''
and repeat until we have the desired result.
At the upper right we can see the histogram
at real time
and we can check our actions.
Be carefull not to overdo it.
Each photo has a certain information.
The fact that we can stretch it
and highlight the information which is hidden
doesn't mean anything.
If we want to stretch more information
we must increase the duration of our frames
along with more of them.
That way we can improve the signal
to noise ratio.
For example. Here, despite the fact i have hidden information
back here
doesn't mean that i will stretch it in order for it to show it up.
Ok it came out,
but see how ''dirty'' the photo is.
ie. We can a set as a limit
the background noise.
For example, here there is too much noise.
So, we go up to the point where we think
the noise is at an acceptable limit.
Another thing we need to notice
are the so called black point and white point.
The black point is at the left
and the white point at the right.
If we say that we clipped the black point,
ie. We burned it out,
we will have this.
We kill information.
ie. We go over
the zero of our information and fall on it,
we bring information form the histogram
to the left.
We see here that we have killed information.
This means we burned out the background.
We can do the same,
for the white point,
the information can go all the way to the right.
We see here that we burned out the
information, the highlights,
and we can see it here as well.
Also we can play with the ''Curves'',
which are simmilar with the "Levels"
but we can pinpoint intervene
and highlight information.
For example we can take a sample
and it will show us where we will intervene.
ie. If we want to highlight here
we need to adjust this point.
If we want to reduce the background,
darken it, we need to adjust at this point.
The more points we place
the more correct our photo will be,
since we intervene on all frequencies.
(By Agellos Kehagias)
(Translated by Kostas Stavropoulos)
We do the same for all the frames.