acro bat 7

acro bat 7

[Hans Hagen]

Hi Willy, [cc to context list]

Long ago we mailed about acrobat messing up colors when using transparencies. 
Well, it looks like it happens again. When transparencies are used, all colors 
are affected (become darker).

In previous versions, the pag ecache was the troublemaker, dunno what causes it 
now, since i cannot influence the cache.

Can you test this on your machine as well?

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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Re: acro bat 7

[Henning Hraban Ramm]

Am 06.01.2005 um 21:59 schrieb Hans Hagen:
> Long ago we mailed about acrobat messing up colors when using 
> transparencies. Well, it looks like it happens again. When 
> transparencies are used, all colors are affected (become darker).
> In previous versions, the pag ecache was the troublemaker, dunno what 
> causes it now, since i cannot influence the cache.

Are you sure it isn't only the overprint preview or the color 
management profiles setup?

(acro bat, because it likes the dark?)

Grüßlis vom Hraban!
---
http://www.fiee.net/texnique/
http://contextgarden.net

Re: acro bat 7

[Willi Egger]

[-- Attachment #1: Type: text/plain, Size: 1710 bytes --]

Hi,

Indeed there was upon a time such a discussion ... Though not 
remembering the details, I found a test file and after a small 
adaptation it gives two pages:
- first page: page-background green (as defined by Context)
- second page: page-background as the first page, text area gets a 
transparent color with the values "normal, 0.5, white".

The result in Acrobat Reader 7 is indeed not to expectation. The page 
backround on the second page is still green, though not at all of the 
same colour.

Apparently there is no mistake in the pdftex-PDF-file because viewing 
this file with Acrobat 5 (!) the result is as expected. The 
page-background remains the same green on both pages.

Kind regards Willi

Hans Hagen wrote:
> Hi Willy, [cc to context list]
> 
> Long ago we mailed about acrobat messing up colors when using 
> transparencies. Well, it looks like it happens again. When 
> transparencies are used, all colors are affected (become darker).
> 
> In previous versions, the pag ecache was the troublemaker, dunno what 
> causes it now, since i cannot influence the cache.
> 
> Can you test this on your machine as well?
> 
> Hans
> 
> 
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
> -----------------------------------------------------------------
> 
> _______________________________________________
> ntg-context mailing list
> ntg-context@ntg.nl
> http://www.ntg.nl/mailman/listinfo/ntg-context

[-- Attachment #2: transparentbackground.tex --]
[-- Type: text/plain, Size: 668 bytes --]

% Testfile for transparent colors used as the text-background
% Hans Hagen
% CONTEXT file
% filename: transparentbackground.tex
% W. Egger
% 09-01-2005

\setupoutput[pdftex]

\setupcolors[state=start]

\startuseMPgraphic{tBG}
	path p ;
	p := unitsquare xscaled \overlaywidth yscaled \overlayheight ;
	fill p withcolor transparent("normal",.5,\MPcolor{white}); % This however results in fading of ALL of the colors...
\stopuseMPgraphic

\defineoverlay[textBG][\useMPgraphic{tBG}]

\setupbackgrounds[page][background=color,backgroundcolor=green,state=repeat]

\starttext

\input tufte\page

\setupbackgrounds[text][background=textBG,state=repeat]
\input tufte
\stoptext

[-- Attachment #3: Type: text/plain, Size: 139 bytes --]

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Re: acro bat 7

[h h extern]

Henning Hraban Ramm wrote:

> Are you sure it isn't only the overprint preview or the color management 
> profiles setup?

no, it looks like the usual cache/anti-aliasing mess in zero versions; my guess 
is that at adobe they test at 256 color / 768x1024 displays -)

nothing to do with overprint / proofing / etc since it;s triggered by 
transparencies being present in the file and transparencies somehow influence 
anti aliasing, accuracy (less accurate slopes), hinting, cooltype etc; of course 
we're talking about tricky rendering, but it's strange to see fundamental old 
bugs show up again

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------