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Thread: Why am I losing color in all my DeepSkyStacker final images?

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    Default Re: Why am I losing color in all my DeepSkyStacker final images?



    Henk,

    If you read through this thread starting from the 2nd page, Phil explains the file saving 'bug' in DSS.

    I hope to be able to use the autosave.tiff files some day when I get a camera, and more memory in my computer to handle these files. But right now, since I'm only using a P&S camera that saves images in jpeg format, and my computer can't handle the autosave.tiff files. I've been forced to save all of my DSS images in 16-bit format (which I understand is really only 8-bit). I'm fine with that for now though, since I'm just getting back into astronomy and AP. I'm sure once I get into this more, and get a decent camera, that I'll demand more from my photos. But for now, it's just been fun coming in the house after a long night outside, popping the memory card in the computer, and seeing what kind of images I was able to pull out the night sky.

    Mark :0)

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    Default Re: Why am I losing color in all my DeepSkyStacker final images?

    Quote Originally Posted by Phil Leigh View Post
    The 32-bit autosave.tif file that DSS produces is the only way of getting decent, accurate data out of DSS unfortunately. If you aren't using a processing package that can properly handle this format (such as PixInsight, Nebulosity or PS) then use something like ImageMagick(free) to convert the file properly to 16-bit.
    Hi Phil, you were absolutely right. I DSS-ed my images again and compared two files for processing in Photo Gallery. The first one was the Autosave.TIFF file using ImageMagick using -depth 16 (which I am guessing means 16 bits), the second one I saved from DSS directly as a 16 bit TIFF. The difference was remarkable. Number 1 showed up pretty dark in Photo Gallery but was easy to stretch, resulting in smooth and rich colors. Number 2 showed up lighter in Photo Gallery but was much harder to stretch resulting in grainy images.

    The DSS Autosave image format may have some bugs because ImageMagick gives me some errors, and they also don't display correctly in Photo Gallery - the aspect ratio is wrong and the right portion is black. Luckily ImageMagick appears to deal with it OK and fixes it.

    This works great! This also suggests that Photo Gallery apparently uses 16 bit color internally, which is nice. How else could it work better so well the 16 bit image. Very cool, thanks for the advice.

    Henk
    ... Henk. Telescopes: 6" Mak-Newt (Comet Hunter), ES ED127CF, ES ED80, Zhumell Z12, Coulter Odyssey 10, AT6RC, Venture RX-7, Celestron Skymaster 20x80, Mounts and tripod: Losmandy G11S, AVX, LXD55, Tiltall, Cameras: Fuji X-a1, Canon SX40, Xt, XSi, T6, ELPH 100HS, DIY: Dob and camera barndoor trackers, afocal adapter, Dob with foldable base and Az/Alt setting circles, Accessories: SSAG, Plossls, Barlows, Telrad, laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software: DSS, ImageMagick, PHD, Nebulosity, Photo Gallery, Gimp, CHDK

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    Default Re: Why am I losing color in all my DeepSkyStacker final images?

    Heh Heh!
    The 32-bit autosave.tif file works perfectly in software designed to handle that format (e.g. PixInsight)... for everything else, use ImageMagick.

    I wish everyone using DSS would follow this one piece of advice - they would get much better results, as you found!
    cheers
    Phil

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