How can I remove all white pixels?

Discussion in 'Photoshop' started by simple_language, Jan 13, 2008.

  1. I am trying to remove all white pixels from a monochrome (black and
    black) picture imported into Adobe Photoshop 5.0 LE. The magic wand
    does not work because it removes contiguous pixels only. Is there any
    way to remove all white pixels?
     
    simple_language, Jan 13, 2008
    #1
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  2. simple_language

    Scott W Guest

    There is a check box with the magic wand that turn on and off the
    contiguous part of the operation.

    Scott
     
    Scott W, Jan 13, 2008
    #2
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  3. Yes, this is quite simple, bt the key isn't in the use of the magic wand as
    you might expect.
    First open your image in photoshop.
    Now open the "select" menu and choose the "colour range" option.
    Now when the colour range window opens, click on a white area in your image,
    and you'll see a small scale monochrome thumbnail preview giving you an idea
    of the selection.
    Click okay, and you'll find that in your image, all the white pixels in your
    image have now been selected.
    Hope that helps.
     
    \(not quite so\) Fat Sam, Jan 13, 2008
    #3
  4. These options do not exist in my version of the Photoshop. (5.0 LE.) I
    guess I should upgrade it.
     
    simple_language, Jan 13, 2008
    #4
  5. simple_language

    Foto Trix Guest

    I use photoshop 6, I use the Remove Background button (hidden in the
    eraser dropdown). I first resize the brush so big it covers
    everything, then I just click on the color I want removed. You will
    have to do some tweaking to get it to remove all the colors
    continously (1st: noncontinuous, then other set to continuous). Not
    the exact answer, but this is what I basically do to remove colors...

    http://www.fototrix.com (mashup your photos online, add special
    effects, frames and fun templates)
    http://www.txt2pic.com
     
    Foto Trix, Jan 13, 2008
    #5
  6. Aaah. I'm working from CS2....Sorry.
    I'm not sure what tools you have avaliable in version 5 to be honest. I did
    have it on my system running alongside CS2, but I got rid of it a few weeks
    ago.
     
    \(not quite so\) Fat Sam, Jan 13, 2008
    #6
  7. simple_language

    ronviers Guest

    Hi,
    One possibility is to:
    Create a new layer of white with as much white as you want to remove.
    For example, rgb=252,252,252 to get ride of the top three. Place this
    layer above the image you want the white removed from and set the
    blend mode to difference. The do ctrl+alt+shft+e to make a stamp of
    that image. The use that stamp as a mask for the image.

    Good luck,
    Ron
     
    ronviers, Jan 13, 2008
    #7
  8. simple_language

    Mike Russell Guest

    Here's one way to select all the white pixels in Photoshop 5 LE. First copy
    the image to the clipboard, then go into QuickMask mode, and paste the image
    to the mask.

    Use levels to set everything below 255 to zero, and everything above it to
    255. Because of the way Levels is implemented, you will need to do two
    repetitions of this in order to get absolutely every white pixel. Switch
    from QuickMask back to normal mode, and pure white pixels will be selected.
    You may use your favorite method is to get rid of them.

    More than likely there are easier and better ways to do what you are trying
    to do. Full Photoshop has the dust and scratches filter that will do this
    quickly and easily. Polaroid supplies an excellent plugin and stand alone
    utility that does this, and it's free:
    http://www.polaroid.com/service/software/poladsr/poladsr.html

    Both of these filters use what is called an "Impulse Filter", which removes
    noise from an image by replacing the noise with averaged values from nearby
    pixels. When using these filters, I find myself using the lasso tool to
    select dust specks from the shadows, followed by a dose of dust and
    scratches. This avoids degradation of detail in the lighter areas of the
    image. If this is what you want to do, Polaroid's Dust and Scratches could
    save some work.
     
    Mike Russell, Jan 13, 2008
    #8
  9. simple_language

    Nervous Nick Guest

    Turn off your monitor? ;>)
     
    Nervous Nick, Jan 14, 2008
    #9
  10. simple_language

    ray Guest

    I don't understand - what are you going to replace them with after you
    remove them?
     
    ray, Jan 14, 2008
    #10
  11. simple_language

    The Bobert Guest

    You've had some good methods suggested. Like most things PhotoShop, there
    are many ways to do most things. Here's how I would do it.

    Open Image
    Select Magic Wand
    Click on a white area.
    Under Special Menu choose Similar

    All white areas should be selected.
     
    The Bobert, Jan 14, 2008
    #11
  12. simple_language

    The Bobert Guest

    You've had some good methods suggested. Like most things PhotoShop, there
    are many ways to do most things. Here's how I would do it.

    Open Image
    Select Magic Wand
    Click on a white area.
    Under Special Menu choose Similar

    All white areas should be selected. Now what are you going to do?
     
    The Bobert, Jan 14, 2008
    #12
  13. As an alternate method, can you magnify the image till you can see the
    pixels clearly and use the clone tool to select an adjacent pixel and
    clone it to the white one?
     
    Don Stauffer in Minnesota, Jan 14, 2008
    #13
  14. Possibly transparency ...

    Answer: "Select => Similar
     
    Sir F. A. Rien, Jan 14, 2008
    #14
  15. simple_language

    ray Guest

    Possibly - it's certainly not clear to me.
     
    ray, Jan 14, 2008
    #15
  16. The reason isn't important, the OP wants to remove -=all=- white pixels for
    some purpose. He/she/it just hasn't learned PS or know about pressing F1.
     
    Sir F. A. Rien, Jan 14, 2008
    #16
  17. Thanks. It worked, but it took some experimenting. My first
    experiments were in the Indexed Color mode. The magic wand always
    crashed the Photoshop. Then I tried Grayscale mode - it worked much
    better. I could select all the white pixels, but I could not remove
    them, so I selected all the black pixels and I pasted them into a new
    layer. This worked much better although I had to spend a minute
    aligning the pasted pixels with the rest of the image.
    ________________________

    I am trying to make a shading for a patent drawing. The U.S. patent
    office does not accept computer renderings of 3D CAD drawings. The
    drawings must have only two colors (black and white) and they must be
    either hand-made, or they must look like hand-made drawings. This
    means that the only way to make relatively nice 3D patent drawings is
    to combine 3 layers (lines, shading, text) in the Photoshop or a
    similar program. The two top layers must be transparent, so all the
    white pixels must be removed.
    ________________________

    The Photoshop is very unstable, it lacks elementary features that one
    expects in a professional program, and its help file is a bad joke. I
    am used to AutoCAD, so I curse the Photoshop makers and I wonder why
    the professional computer programmers have not driven the Photoshop
    makers to the unemployment line.
     
    simple_language, Jan 14, 2008
    #17
  18. simple_language

    John Navas Guest

    A well-known bug in PSE6 is that pressing F1 *doesn't* work!
     
    John Navas, Jan 14, 2008
    #18
  19. simple_language

    The Bobert Guest


    I typed Special instead of Select.

    Open Image
    Select Magic Wand
    Click on a white area.
    Under Select Menu choose Similar
    All white areas should be selected.
     
    The Bobert, Jan 14, 2008
    #19
  20. simple_language

    ronviers Guest

    Here is a list of the service packs from AutoCad LT from 1999:

    http://usa.autodesk.com/adsk/servlet/ps/dl/index?siteID=123112&id=2334435&linkID=9240818#section9

    I assume that's the version you're using. Is that correct - AutoCad LT
    from 1999?
     
    ronviers, Jan 14, 2008
    #20
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