Am 29.09.2016 um 13:25 schrieb Ján Kaššovic:
Hi,
thank you for pointing me to that class, it is the first time I see such a
thing work and I hopefully would be able to use it to achieve viable
solution.
I went through the example and you've said that I should have "set the
transparency". I did not noticed such thing anywhere in the example, there
is just straight up load, which creates a BufferedImage with the color
model that has a Transparency type BITMASK. If I load the PNG I've attached
in the same fashion as it is in the LosslessFactoryTest, I get Transparency
type TRANSLUCENT. I have to therefore disable couple of asserts and
validations, but at the end it produces the pdf output as it was with the
gif, with 1 major difference, no transparency kept from PNG.
Why did I made an "inception like" image load? I am actually generating the
PNG programatically as an input. I've met with issues when it came to
achieving transparency, the first thing that worked was
creating a first image that was transparent and use its ImageData as a
source for the final java.awt.Image. Also the stackoverflow comment claimed
it worked after some version. That's just the reasoning why I went for it,
not claiming it is the correct thing to do.
The transparency is set by setting the alpha byte (the highest byte) to
something between 0 and 255. For example, you could decide that
everything with an rgb value close to 255 255 255 should be fully
transparent (0).
Tilman
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