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. :-)

-- 

Regards
     Stephen

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