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Apprise me if you know better examples. I trust obvious what boundary I'm trying to Blur — the two different hues of grass or water. And the forehead with the bad haircut, because the hair cut off too abruptly.

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xenoid advised

If you want to use the blur tool: you can try to increase the "Force" in the Tool options and/or use a harder brush. You don't need to click hundreds of times, just depress the left mouse button and wiggle the mouse over the cut.

I tried this wiggling for the past ten minutes, but the boundary blurs too little and slowly! All this wiggling's WEARYING and FATIGUING my hand!!! I need the Blur tool to work more forcefully, expeditiously, nimbly!

  1. What if I increase the tool size to cover the whole borderline? Aim my mouse so that I cover the whole border. Then depress my mouse and keeping it at the same spot, without any budging or wiggling?

  2. Pls review my settings for the Blur tool? I turned up Force to 100 as xenoid advised, but did I overlook anything else?

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  • What are you actually trying to achieve here? As it stands, your question reads like an XY Problem.
    – Billy Kerr
    Oct 15 at 16:27
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    @BillyKerr - for that, see comments under my answer. It is an XY Problem.
    – Tetsujin
    Oct 15 at 17:58
  • @Tetsujin - oh, I didn't see that. Thanks. Yeah, definitely an XY Problem.
    – Billy Kerr
    Oct 15 at 18:29
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You overlooked the first 2 pieces of advice in the comments & in the answer. Why not use a blur filter, or a gradient instead?
The blur tool is just not designed to give you some huge 800px blend between 2 solid colours.
Pick a more suitable tool.

Just using a blown-up crop from your earlier question, so this is far more pixellated than using the original image…

5 minutes of scribbling with the blur tool
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One tweak of a slider in Gaussian Blur
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After the heavy question edit - I have absolutely no idea what the expected result for such as this could possibly be, but you can do the same thing with a feathered selected area…

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5
  • Thanks. Very sorry...I wrote my post badly. I didn't mean that simple green vs. blue boundary. I meant borders in real life pictures. Pls see my edited post.
    – user168829
    Oct 15 at 8:33
  • Why on earth are you trying to blur the boundaries between distinct areas on the new examples? What do you hope to gain?
    – Tetsujin
    Oct 15 at 8:56
  • For my work, I need to combine pictures together and blur the boundaries. These examples are for practice.
    – user168829
    Oct 15 at 9:05
  • 2
    You really need to ask the question you need the answer to - because this isn't the way I'd feather two images into each other to hide the join. If you ask the wrong question, you will get the wrong answer.
    – Tetsujin
    Oct 15 at 9:06
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    @Tetsujin Yes, typical XY problem
    – xenoid
    Oct 15 at 12:10

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