On 26-11-2014 14:12, Stephen wrote:
> On 26/11/2014 12:45, Thomas de Groot wrote:
>> On 26-11-2014 12:36, Stephen wrote:
>>> I am reworking an old globe of the Earth and I see that I used a cloud
>>> map image with 4 bit colour depth. So that I could manage the
>>> transparency (only 16 pallet entries).
>>> It was okay for a small image but now I want something with more
>>> resolution.
>>> Any suggestions?
>>>
>>
>> Could you use this?
>>
>> http://www.shadedrelief.com/natural3/pages/clouds.html
>>
>> Thomas
>
> I am or something like it.
> My understanding is that PovRay uses either an alpha channel or a pallet
> based transparency. With the pallet based method 256 channels are the
> most you can use. I was hoping that someone had devised a way to use the
> greyscale value.
>
> I have an acceptable result by converting the original image to 8 bit
> and blurring it a small bit. Then inputing the pallet entries by hand.
> Or by Excel, actually. :-)
>

What is a pallet-based transparency? The term is unfamiliar to me.

Thomas

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