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February 2008
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2008.02.12 02:31 "Re: Help with TIFFWriteScanline()", by James Sumners
Indeed I was. I thought I had sent a couple follow ups to the list where I said I figured that out. Maybe they didn't come through? On Feb 11, 2008 12:20 PM, Chris Cox <ccox@adobe.com> wrote: > I think you're confusing SamplesPerPixel with BitsPerSample. > > > > -----Original Message----- > From: tiff-bounces@lists.maptools.org on behalf of James Sumners > Sent: Mon 2/11/2008 8:33 AM > To: tiff@lists.maptools.org > Subject: [Tiff] Re: Help with TIFFWriteScanline() > > After browsing the mailing list archives I found out about the > tiffinfo tool. tiffinfo reported that my original image had a > SamplesPerPixel of 1. For some reason, unbeknownst to me, my program > is getting a value of 0 for SamplesPerPixel from the original image. > So I manually set the value to 8, because that is what I understand > the specification to be (8 or 16 SPP for grayscale/color and 1 SPP for > bilevel). After changing my manual SPP value from 8 to 1 the copied > image is written correctly. > > This is the first time I've done any graphics programming. So I'm sure > that I am not understanding something. Would someone please explain > this situation to me? Would 8 SPP squeeze the image into a smaller > space? How is 1 SPP producing a grayscale image? -- James Sumners http://james.roomfullofmirrors.com/ "All governments suffer a recurring problem: Power attracts pathological personalities. It is not that power corrupts but that it is magnetic to the corruptible. Such people have a tendency to become drunk on violence, a condition to which they are quickly addicted." Missionaria Protectiva, Text QIV (decto) CH:D 59