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Thread: monochrome bmp

  1. #1
    Join Date
    May 2005
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    monochrome bmp

    How to I create a monochrome bmp in photoshop ? I have a logo I use for my business that has a white back ground, blue image and red letters. I have a screen saver that is asking for a black and white monochrome bmp.
    I am using photoshop cs and only have a photoshop 5 book which isnt telling a whole lot other than checking monochrome under the channel mixer, but it still isnt working correctly so obviously I am doing something wrong.

    any and all help would be greatly appreciated.

    Thank you.

  2. #2
    Join Date
    Jul 2003
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    monochrome bmp

    Hi flgirl,

    Welcome to the forums!

    First a definition...
    Bit depth
    The number of bits that are used to store a pixel's color information for display. Graphics are also often described by the number of bits used to represent each dot. A 1-bit image is monochrome; an 8-bit image supports 256 colors or grayscales; and a 24- or 32-bit graphic supports true color.

    When you use a 1 bit image you will have only black or white pixels, there will be no grays so no anti-aliasing. Any overlapping images will merge as they will be all black. So...

    I'd suggest using your Magic wand tool with anti-aliased checked but contiguous unchecked in the options bar. Click on the white area. Inverse the selection (Control Shift I = Command Shift I on a Mac). Fill with black.

    Next, Image > Mode > Grayscale followed by Image > Mode > Bitmap. In the Bitmap dialog, I'd suggest changing the Resolution to 96 ppi and for Method you might want to experiment but '50% Threshold' probably will give you your best edges.

    Now Save As..., choose BMP and your only option will be 1 bit.


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