Cleaning Up a Meshed-Up Background Image

I got this task from my friend. She needs the image for her journal publication, but the committee want a more 'clear' picture instead of the actual picture taken from her lab's machine (dunno the name, she's studying some chemical thing).

At the end I agree to help, but I didn't promise I could clean it up because the background seem very mesh-up! With gradation of color there and here, it looks very hard to clean.

Well, after several trial I finally able to clean it. In case I would forget how to do it, here are the documentation.

1) Open the picture in Photoshop; here is the original



2) Then duplicate the layer to make sure you still have the original. Right-click at the 'layer 1' and choose 'duplicate' or Ctrl+J.
3) You have a 'layer 1 copy' now. Click on menu 'Image', on the drop down, choose 'Adjustment' the choose 'Black and white'.

4) On the drop down option, pick 'Maximum White'. That's it! Now you should have something like this:
5) You might as well keep some color just to strengthen the "message" of your image, here's how. After step (2), create another duplicate (you should have 'layer 1 copy 2'). Then follow step (3).
6) Since the most of the background color is blue, pick 'Blue Filter'. You should get something like this

7) Now, on the 'Tools' pick 'Magic Wand Tool' or press 'W' on your keyboard. Adjust the 'Tolerance' to 0 and select 'Add to Selection'. Click on the white section of the layer.
8) This part is a little hard to do, you need focus! Still using 'Magic Wand Tool', click on the white area which isn't selected by previous click. Be careful.
9) Now click on 'layer 1 copy' and click on the visibility icon on 'layer 1' and 'layer 1 copy 2' to make them invisible. [I found another way, check out the note at the end of step (13)]
10) The last step, either you fill the selection we made with white color or you delete it, the result will be the same.
11) Press Ctrl+D to deselect the selection. You can stop here and you are done. Or you might want to make the color seem more natural.
12) Turn on the visibility icon for 'layer 1'. Select 'layer 1 copy' and click 'add vector mask' at the bottom of the 'layer tool'.
13) Pick 'Brush Tool' or press 'B' on your keyboard and start brushing the area you want to have more color. You can either choose 'Normal' or 'Multiply' on the drop down mode. YOU CAN EXPERIMENT YOURSELF ON THIS!. (I am too lazy to brush carefully :p)
[Another way
Start from step 8, i.e. this will be the step 9.]
9) Create another layer below the current layer, by clicking 'New Layer' button while holding CTRL key.
This will be 'layer 1 copy 3' on top of 'layer 1 copy'. Fill this new layer with whatever color, press Ctrl+Backspace to fill it back background color, which is white.

10) Hide 'layer 1 copy 2', while the selection still on. Click on menu "Filter" and hover on 'Blur', then pick 'Gaussian Blur'. Adjust the amount of blur according to your taste.

11) Deselect the selection by pressing Ctrl+D on keyboard.
[You are done. Isn't it better?]

That's all! I hope you could correct me for mistake or suggest me a better way.
Credit goes to:
  1. Dias, for your challenge made me learn more;
  2. Tri, for your share of knowledge.

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