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- Path: news-m01.ny.us.ibm.net!usenet
- From: geohei@ibm.net (Georges Heinesch)
- Newsgroups: comp.sys.amiga.graphics
- Subject: Re: 256 color WB
- Date: 27 Feb 1996 07:57:03 GMT
- Message-ID: <1635.6631T534T1917@ibm.net>
- References: <268.6624T1172T391@ibm.net> <19960220.75967C8.12A09@shadow.res.cmu.edu>
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- In a message of 27-Feb-96 00:22:22, Michael van Elst wrote:
-
- MvE> Oh, they are used. But what happens when you need more colors ? The
- MvE> first colors are allocated from free pens (and are precise). The next
- MvE> colors share an already allocated pen and are probably quite wrong.
- MvE> The major problem is that there is no smart decision to what pens are
- MvE> going to be precise and what pens are going to be approximated.
-
- You say that the first colors are allocated to free pens ...
-
- 1. How many colors of a 200 color picture approximately?
- 2. Is it really that the first colors of the backdrop picture are only
- considered, or that the algorithm is looking for colors not yet existing
- on shared pens?
-
- But what can be done about the pens sharing system, that the picture
- datatype is considering *all* the colors, making a color reduction
- according the number of free pens (in my case 240), and then allocates
- those colors simply to the free pens!
-
- ADPro or ImageFX don't do more than that and there it works fine, why not
- here and what can be done on the datatype level (not on the picture level
- with color deductions (with e.g. ADPro) prior using the backdrop picture).
-
- >>You want me to but all those pens to 0,0,0, thus reducing the colors in
- >>the background pricture from 256 to 240 colors, right?
-
- MvE> A simple color reduction (for example with ppmquant) is sufficient.
- ^^^^^^^^
- Sorry but what's ppmquant?
-
- TIA
-
- --
- Georges Heinesch, Luxembourg
- geohei@ibm.net
- PGP 2.6.3i public key available on request and on public servers
-
- ... what goes up, must come down ...
-
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