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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Transparent objects either possess outlines when none are defined or are completely opaque, depending on export PNG options"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=135910#c11">Comment # 11</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Transparent objects either possess outlines when none are defined or are completely opaque, depending on export PNG options"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=135910">bug 135910</a>
from <span class="vcard"><a class="email" href="mailto:mwtjunkmail@gmail.com" title="mwtjunkmail@gmail.com">mwtjunkmail@gmail.com</a>
</span></b>
<pre>(In reply to Mike Kaganski from <a href="show_bug.cgi?id=135910#c9">comment #9</a>)
<span class="quote">> The problem is that now, when the painting of objects happens on a clear
> transparent vdev, painting the object (e.g. rectangle in case of attachment
> 164477 [details]), happening in two stages (RGB separately, alpha
> separately), only sees white background while drawing RGB. AA makes the
> painting to blend with the background on edges, which results in the borders
> of the shape to become light (and semi-transparent, but the unintended
> *color* change happens anyway).
>
> I suppose that it should instead somehow see that the pixels it blends with
> are completely transparent, and then do not change color, and only apply AA
> to transparency. But I don't yet have an idea how to perform that in out
> weird separated (RGB / Alpha) graphics.
>
> Thorsten, quikee, Lubos: possibly you have some ideas?</span >
Exports using the TIFF format (both whole slide and as a selection) do not
exhibit any of the problems this or my previous bug listed (but I need PNG
files).
Perhaps model the PNG export after however TIFF handles it?</pre>
</div>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Transparent objects either possess outlines when none are defined or are completely opaque, depending on export PNG options"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=135910#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Transparent objects either possess outlines when none are defined or are completely opaque, depending on export PNG options"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=135910">bug 135910</a>
from <span class="vcard"><a class="email" href="mailto:mwtjunkmail@gmail.com" title="mwtjunkmail@gmail.com">mwtjunkmail@gmail.com</a>
</span></b>
<pre>(In reply to Mike Kaganski from <a href="show_bug.cgi?id=135910#c9">comment #9</a>)
<span class="quote">> The problem is that now, when the painting of objects happens on a clear
> transparent vdev, painting the object (e.g. rectangle in case of attachment
> 164477 [details]), happening in two stages (RGB separately, alpha
> separately), only sees white background while drawing RGB. AA makes the
> painting to blend with the background on edges, which results in the borders
> of the shape to become light (and semi-transparent, but the unintended
> *color* change happens anyway).
>
> I suppose that it should instead somehow see that the pixels it blends with
> are completely transparent, and then do not change color, and only apply AA
> to transparency. But I don't yet have an idea how to perform that in out
> weird separated (RGB / Alpha) graphics.
>
> Thorsten, quikee, Lubos: possibly you have some ideas?</span >
Exports using the TIFF format (both whole slide and as a selection) do not
exhibit any of the problems this or my previous bug listed (but I need PNG
files).
Perhaps model the PNG export after however TIFF handles it?</pre>
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