| From: | Keith Halstead |
| Date: | 13 Oct 99 at 17:12:22 |
| Subject: | Re: Numeric Transparancy |
From: Keith Halstead <keith@halsteadk.freeserve.co.uk>
Hi Michael,
On 13-Oct-99, you wrote:
>> A palette for a palette-based image is a list of colours. There could be
>> from 2 to 256 colours. (Or more in theory.)
>>
> Your are talking about AGA here, because OCS/ECS can only handle
> colour values upto 15 (for example Red 15, Green 15, Blue 15).
> If you multiply 15x15x15=the answer should be 4096 (4096 colours
> though HAM). The AGA chipset could do 256x256x256= should
> be 16.7 million colours (though HAM ofcourse).
The original email was about transparent GIF images. These can have only up to
256 different colours defined out of a choice of 16.7 million, ie the same as
an 8-bit 256 colour AGA screen. Talk of OCS/ECS/HAM is irrelevant here!
BTW, AGA can only do 262,144 colours at a time through HAM8 as there are only
64 levels of red, green and blue to choose from in this mode (though
undoubtedly there are various software tricks which allow more).
Regards,
Keith
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