Selection tool sensitive to color in a limited area of the image

Hi all

For my work, I am interested in the measure of the area of pixel of the dark (black) in the sub picture, even the smallest. For less complex images, I used the magic wand and the selection tools to select my black areas and have Photoshop CC 2015 do measures on my selection. The problem with the image below that I have is that there are so many blackheads and they are scattered all over the image. Non-continuous the magic wand option unfortunately does not work for me in this case, because some of the dark spots have the same color as the other dark areas in the picture. So far, I only managed to make a good choice by selecting each point individually, which is a very tedious and somewhat subjective work. What I would like is a sort of quick selection tool with a tolerance as the magic wand option, so I can just fly over areas with small black to select tasks that these. I don't think that this is available in Photoshop, I'm looking for alternatives. That would also work for me, it is to have a way to limit the area that the magic wand tool selects objects of. For example, set a small area (as one of the white ice blocks) and then use the selection option discontinuous of the wand in this ice blocks so it will only select the dark stains on the ice block. If I can do this several times and combine the selections, I should be defined as well. Is it possible to achieve such a thing in Photoshop? In other words, what I would basically is the type of features in the background removal tool, but then make a selection in the foreground based on a color. All other ideas, suggestions, tips and tricks are also welcome! I hope my question is clear and that there is a solution for my problem. I'm very new to photoshop, so please be very clear in your answer, so I can understand every step .

Edit: I noticed that I posted this maybe in the wrong part of the forum (?), I was a bit in a hurry at work. My apologies. If there is no matter what mod around to place them in the right sub-forum, please do!

Herded slick (PS).jpg

It works for you?

To see it in full screen, double click on the image.

1 use the curves to increase the contrast

2. place an empty layer below the image and fill it white

3. return to the top layer, click on the layer to bring up the layer Style

4. in the section mixture if move the top left right slider until the black dots you want are isolated.

Also, consider using this technique after the first change the mode to grayscale

Tags: Photoshop

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