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From: "Eric B. Middlecamp" <ebmiddlecamp@imation.com>
To: tiff@olympiakos.com
Message-ID: <862567B0.0058FC29.00@mail2.imation.com>
Date: Fri, 16 Jul 1999 11:08:41 -0500
Subject: Re: RGB Gradient Code, adapted from Andreas Neumann
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Niles Ritter <ritter@earthlink.net> on 07/16/99 01:23:55 AM

To:
cc:   TIFF Mailing List <tiff@olympiakos.com> (bcc: Eric B.
      Middlecamp/MIPP/Imation)
Subject:Re: RGB Gradient Code, adapted from Andreas Neumann



> "Eric B. Middlecamp" wrote:
> > I made a simple extension to Andreas Neumann's gradient code,
> > (see
> >
http://www.gis.univie.ac.at/strv/strv/leute/andi/computer/graphics/raster-formats/example_tiff_main.html
)
> > but the output TIFF image has some odd contamination. Looking at the
> > image, you wouldn't be able to tell -- however a histogram reveals that
> > some levels are omitted and others are doubled.
> >
> > Has anyone else experienced bizarre anomalies like this?
> >
>
> No.
>
> I just ran your little routine, and got a perfect 0-255 vertical gradient.
> Are you sure your monitor is on true 24-bit color and not 16-bit or 8-bit?
> Try running "tiffinfo -d" on your image to look at the values.
>
>   --Niles.
>

Niles,

My monitor depth is set to millions of colors.  Note that the results I get
_look_ correct, but
I found anomalies when I used Photoshop to display the histogram. Note that I am
running on
a Mac, so the problems might be system-dependent.

I'll try using tiffinfo-

Thanks,
Eric Middlecamp


