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Re: saving a paletted PNG [message #6088 is a reply to message #6080]

Mon, 30 October 2006 07:33

mirek is currently offline

mirek
Messages: 13980
Registered: November 2005

Ultimate Member

OK, I see 3 possible solution:

* Quick fix, without altering U++, little bit ugly

See PalleteCv class, Get. As you are able to set any palette to RasterEncoder, it is possible, based on PalleteCv conversion, to build special palette and

RGBA PaletteIndex(int index);

that will force those shifted values to produce specific index. Later I would add this to U++. Would be a bit slow, but not extremely slow.

* Indexed mode in PaletteCv and/or RasterFormat

Alter conversion routines to use some channel (most likely R Smile

Smile

as direct palette index. E.g. by using (PaletteCv *)1 in Write

* Perfect but complicated solution

Well, this one already happened in Raster - add support for Raw modes in RasterEncoder (RasterEncoder::WriteLine(byte *data)). This is far the most work and paradigm shift too.

Right now I would vote for the first option, in the same time I am afraid that last option would be nice to have too. But these are orthogonal.

Mirek

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[Message index]

		saving a paletted PNG By: lindquist on Sun, 29 October 2006 20:42
		Re: saving a paletted PNG By: lindquist on Sun, 29 October 2006 20:53
		Re: saving a paletted PNG By: mirek on Sun, 29 October 2006 20:55
		Re: saving a paletted PNG By: lindquist on Sun, 29 October 2006 21:02
		Re: saving a paletted PNG By: lindquist on Mon, 30 October 2006 00:10
		Re: saving a paletted PNG By: mirek on Mon, 30 October 2006 00:34
		Re: saving a paletted PNG By: lindquist on Mon, 30 October 2006 01:04
		Re: saving a paletted PNG By: mirek on Mon, 30 October 2006 01:11
		Re: saving a paletted PNG By: lindquist on Mon, 30 October 2006 01:18
		Re: saving a paletted PNG By: mirek on Mon, 30 October 2006 07:33
		Re: saving a paletted PNG By: mirek on Tue, 31 October 2006 11:48
		Re: saving a paletted PNG By: lindquist on Tue, 31 October 2006 15:31
		Re: saving a paletted PNG By: mirek on Sun, 05 November 2006 20:27

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