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Re: wrong color in images

From: Regina Henschel <RB.Henschel@t-online.de>
Date: Thu, 20 Sep 2001 13:07:46 +0200
Message-ID: <3BA9CE02.EA29621D@t-online.de>
To: www-amaya@w3.org
Irene Vatton schrieb:
> > Hallo,
> >
> > I use amaya-5.1 (11 July 2001) on Win98. I've got the graphic card
> > ASUS V3000 with driver V3.41 Beta 2. When I use high-color (16Bit),
> > Amaya shows wrong colors in the images, when I use true-color
> > (24Bit) or 256 colors, the images are correctly displayed. This
> > error doesn't depend on gif, jpg or png.
> >
> > Can I solve the problem by settings somewhere in amaya or is it a
> > bug, so that I must wait till a bug fix is available?
> The color encoding differs with each platform (Windows or Unix) and each
> screen depth. I tested a lot of these configurations including the
> 16 Bit screen + Windows platform (Win 95/98/NT) and it works correctly
> with tested images (those included in the AmayaPage.html, Annotations.html,
> etc.)
> Do you have troubles with these images?


I experimented on some pictures, perhaps the results can help fixing
the bug. I constructed a picture with pure red, pure green, pure
blue, mixed red-green = yellow, mixed red-blue = magenta, mixed
blue-green = cyan, white, black.
Amaya shows this picture correctly in gif, jpg and png. Then I
transformed the picture to a gray-scaled. The colornumbers (as they
are read in PaintShopPro) are now each identical for the three
color-parts; they are 76, 150, 28, 226, 104, 178, 255, 0 in the
above order. This gray-scaled picture Amaya doesn't show correctly.
In gif and jpg I get dark and light violet for 150, 226, 178 and
olive for 76 and 104. For 28 I get near black. If you need
colornumbers, I can read them from the screenshot. In png the
picture is shown completely wrong or amaya crashes with closing.

with kind regards
Regina Henschel
Received on Thursday, 20 September 2001 07:08:33 UTC

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