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1999.07.15 23:47 "RGB Gradient Code, adapted from Andreas Neumann", by Eric B Middlecamp
1999.07.16 06:23 "Re: RGB Gradient Code, adapted from Andreas Neumann", by Niles Ritter
1999.07.16 16:17 "Re: RGB Gradient Code, adapted from Andreas Neumann", by Daniel Mccoy
1999.07.16 17:39 "Re: RGB Gradient Code, adapted from Andreas Neumann", by Eric B Middlecamp
1999.07.16 20:04 "Re: RGB Gradient Code, adapted from Andreas Neumann", by Phillip Crews
1999.07.16 16:08 "Re: RGB Gradient Code, adapted from Andreas Neumann", by Eric B Middlecamp

1999.07.16 20:04 "Re: RGB Gradient Code, adapted from Andreas Neumann", by Phillip Crews

Eric,

I believe Photoshop is adjusting sample levels for color correction. Try
turning off all color conrrection and conversion during import.

If you wish, I'll be glad to generate a histogram using my program
(ThumbsPlus), with a guarantee that no pixels are adjusted, and email it to
you; just send me your gradient image.

Kind regards,
Phillip Crews
Cerious Software Inc.
http://www.thumbsplus.com

At 01:39 PM 7/16/99 , Eric B. Middlecamp wrote:
>Ok, here goes.. I am running on a Power Mac 8100/100 under MacOS 8.1, I am
>compiling under Codewarrior IDE 2.1, displaying the images in Adobe Photoshop
>5.0, producing the histogram in Photoshop with full data sampling (histogram 
>not
>from cache), and I am using a Mac-compiled version of the old libtiff
>"tiff-v3.4beta028," although I have compared the code for libtiff version
>"tiff-v3.4beta037" and not found any major differences.
>
>As an update, I just ran a modified version of "tiffinfo," it verified
that the
>image I have matches what Niles got when he ran it; the problem must be
related
>to the image readers, namely Photoshop. I am also writing some code which
reads
>TIFFs, though, and I have gotten some strange results there as well. Is it
>possible that I am using a valid, but uncommon/problemmatic, set of tags?