Bitmap to PNG

Discussion in 'Photoshop' started by Andy, Jan 11, 2011.

  1. Andy

    Andy Guest

    Hi all,

    I have a bitmap image and when I open it in Photoshop or similar I get
    a lot of extra black dots / detail around the image. Is there any
    fast way of avoiding this or getting rid of these black dots / pixels.


    Andy ;-)
    Andy, Jan 11, 2011
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  2. Try converting it to greyscale. That's Image -> Mode -> Greyscale, then
    File -> Save As -> PNG
    John Stafford, Jan 11, 2011
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  3. Andy

    Joel Guest

    I don't think a poor-quality image will get better-quality by converting
    to different format. Or the quality would be SAME->WORSE than the original
    *not* better
    Joel, Jan 11, 2011
  4. Andy

    Ulysses Guest

    I agree completely and, of course he could use the clone tool
    i have taken old photos and carefully remove scratches and age marks
    it is a pain staking job. so he has to ask himself "is the photo worth it to
    Ulysses, Jan 12, 2011
  5. Andy

    Kele Guest

    I can't seem to duplicate "black dots" on a bmp. John, why convert to black
    & white (grayscale)? And then why convert to PNG?

    Try converting it to greyscale. That's Image -> Mode -> Greyscale, then
    File -> Save As -> PNG
    Kele, Jan 12, 2011
  6. I was thinking the OP was referring to 1-bit depth B&W. I'm probably
    John Stafford, Jan 12, 2011
  7. Andy

    Kele Guest

    That's where I saw the black pixels, and is probably the quick fix for Andy
    who should check (try) other bit-depths to get rid of black pixel blocks on
    bmp image(s).

    Good one, John. I got that sharpening technique memorized; changing to
    grayscale first makes for a hint less saturation in the end.
    Kele, Jan 13, 2011
  8. Andy

    Joel Guest

    I have my readet set to killfile all messages from Gmail (too many spams
    from gmail) so I don't see and can't reply directly to the OP.

    I can't see how good/bad the image is, but I can give some option. If the
    quality is very poor and need to be edited then

    1. Switch to 16-bit or 32-bit. I only use 16-bit to have much experience
    with 32-bit, and I only use this on real poor images download from internet
    for DVD Label. This mode will help smoothing the edge/channel

    2. For printing (larger print) one may want to try Resize Image using
    PERCENTAGE option.

    3. Editing, newer CSx version has Healing Patch/Brush which works better
    than Clone Tool (in most cases). If the Healing Patch/Brush doesn't work
    well then Clone Tool may do the trick.

    I rarely use those, but I did use Clone Tool in the past, and Healing Tool
    as practicing.
    Joel, Jan 13, 2011
  9. Andy

    Ulysses Guest

    Thanks have recently upgraded from PS7 to CS5
    and have lots to learn...guess that is the reason for visiting this group
    will check out the new healing tool
    Ulysses, Jan 13, 2011
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