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Threshold feature

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    Requested Threshold feature

    I think a threshold feature would be very useful in Irfanview.

    It would be great if this tool could be incorporated in a small window which allows you to drag sliders and preview what will happen to the image (as I have seen in an image processing program called NeatVision).

    One slider could control the upper brightness or white limit/threshold that will be included in the image and another slider to control the lower darkness or black limit/threshold that may be included in an image.

    Then the pixels that end up outside the two limits could also be set to two user defined levels respectively.

    When working on color images I have always had to separate the image into three red green blue images and perform the threshold manually in each channel... I do not know how difficult it would be to create a threshold operation for complete color images?
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