Mar 18

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When you have to use high value of ISO in your photos it's sure that you'll have some noise problem, also using full frame camera. But in post-production it's possible di reduce this aspect. Photoshop CC has two filter in order to reduce the chromatic noise: 

  • Reduce noise
  • Dust and scratches

Reduce noise filter

We start with this image; how you can see the backgroud is a bit grainy (click the picture to zoom in)


but with the reduce noise filter we can get this situation: using the filter setting of the picture the noise background is less then before, but it's already a little bit visible.



Dust and scratches


With this filter is possible to get a very soft background, in fact with only a radious of 6 pixel the chromatic noise is cancelled.



Now is better to explain one thing: these two Photoshop filter are very useful and you could get some very interesting results in order to remove chromatic noise related at high ISO, but they have to be contextualized to the photo because in some case is better to use the first filter, and in other cases is better to use the second filter. Futhermore if you printed your photos, in the most cases you coudn't see the chromatic noise, so that work could be unuseful, instead if you publish your pictures only on the Web, so it makes sense.

Second thing. In this short tutorial I worked with different copy layers: one for the background and one for subject that I have cutted out with some Photoshop tools in order to get a better job, and to compare the photo before and after the filters application.

My advise is to try with the first one filter, and if the result aren't so good so try with the second one, but Always working with the layers.



Sep 17

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Time ago I found a new way to make more sharpness an image using lab color method in Photoshop CC 2017.

The first thing I do is adjust basic parameters with Lightroom CC 2017:
...and after (the red box indicates the modified parameters):
then I open the image with Photoshop:
I now perform several functions as follows: duplicate the main layer
and then I convert it to an advanced object (the icon layer changes...):
After I open the advanced object layer with a double click on the icon and I convert the image in Lab color...
Now I select the Chanel tab and the Luminosity layer (see the red box...): the image becomes black and White...
Then I make a selection with CTRL+click on the Luminosity icon of the Lumonosity layer and I invert the selection with CTRL+SHIFT+I.
Now we can apply the sharpness filter two times...
the first with the following parameters: 200, 1, 2
the second with the parameters 50, 20, 2.
Now you have to save the image (CTRL+S) and close the advanced object image with the following result:
The 100% zoom with the sharp lab mask...
... and without.
Because the mask is too strong I prefer to shade a little bit about 50% (see the red box at opacity option):
Now we have to reduce the general noise, so we create a selection with Quick selection (with this tool I select some vegetation on the left...) and Polygonal selection tools for refinement, and...
... than create a new layer with copy&paste the selection.
The next step is to reduce the noise of the middle layer with Noise reduce tool:
Reshade the first layer at about 50% of opacity for the final result.
I hope you enjoy with this tutorial and see you soon!!


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