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Author: Albretch MuellerAlbretch Mueller Date: Jun 14, 2008 06:00
I am coding a tabbed window using java/swing
Why is it that some png pictures somehow blend their backgrounds with their
surroundings' and some other don't?
Take a look at both examples
http://www.geocities.com/tekmonk2005/pix/example00_OK.jpg
http://www.geocities.com/tekmonk2005/pix/example02_BackGroundNotGood.jpg
When users click on "Save" the entire background gets higlighted (including
the png pix' itslef), but when they click on "Q & Ans" the background of
the picture itself doesn't.
How can you make it consistent like "Save"?
If you have, say, a jpeg pix and you converted to png using gimp. What
property of "png" graphix should I look into as I export the file?
Thanks
lbrtchx
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Author: Joshua CranmerJoshua Cranmer Date: Jun 14, 2008 06:32
Albretch Mueller wrote:
> Why is it that some png pictures somehow blend their backgrounds with their
> surroundings' and some other don't?
Transparency, controlled by what can be termed "opacity" or the "alpha
channel."
> If you have, say, a jpeg pix and you converted to png using gimp. What
> property of "png" graphix should I look into as I export the file?
I haven't used gimp in a while, but I believe the feature is named
"Color to Alpha" or something like that; you have to make the pixels
transparent before exporting.
P.S. It's graphics, not "graphix"
--
Beware of bugs in the above code; I have only proved it correct, not
tried it. -- Donald E. Knuth
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Author: Andrew ThompsonAndrew Thompson Date: Jun 14, 2008 06:54
On Jun 14, 11:00Â pm, Albretch Mueller gmail.com> wrote:
...> Â If you have, say, a jpeg pix ...
JPEG is an extremely poor format for storing
simple images with few colors. As an example,
that 'light bulb' icon seems to originate from
a concept that only involved 16-32 colors, yet
the actual area of the screenshot it occupies
now contains 1023 colors.
>..and you converted to png using gimp. What
> property of "png" graphix should I look into as I export the file?
The transparency value of the colors. It is
tricky though, when you might have 22 slight
variants of 'off-white'. Also, that icon was
meant to show partially transparent 'effects'
around the exterior dots. Those pixels need to
be made partially transparent as well, in order
to get the right effect with a different background.
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Date: Jun 14, 2008 07:06
Albretch Mueller wrote:
PNG is a format that supports transparency. In your examples, it seems
that the hard drive icon has a transparent background (that is, the
pixels surrounding the hard drive graphic are transparent). The light
bulb icon doesn't seem to have the same transparent background.
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Date: Jun 14, 2008 07:09
Andrew Thompson wrote:
> The transparency value of the colors. It is
> tricky though, when you might have 22 slight
> variants of 'off-white'. Also, that icon was
> meant to show partially transparent 'effects'
> around the exterior dots. Those pixels need to
> be made partially transparent as well, in order
> to get the right effect with a different background.
>
> How you would achieve all that in gimp (or any way
> other than editing by hand), I do not know.
Color to Alpha, under the Colors menu.
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Author: Roedy GreenRoedy Green Date: Jun 16, 2008 04:43
On Sat, 14 Jun 2008 09:00:57 -0400, Albretch Mueller
gmail.com> wrote, quoted or indirectly quoted someone who
said :
> Why is it that some png pictures somehow blend their backgrounds with their
>surroundings' and some other don't?
try a modern browser like Firefox or Opera. I suspect you will see
the problem only on IE which still has bugs in its PNG rendering.
See http://mindprod.com/applet/masker.html
for a description of the problem as the "doctoring" kludge to make PNG
images work on IE.
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Author: David A. RedickDavid A. Redick Date: Jun 16, 2008 11:58
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