Op 19-4-2024 om 13:27 schreef William F Pokorny:
> On 4/19/24 02:36, Thomas de Groot wrote:
>> I never used that wiki example though. I wonder if that is not 
>> specifically for GIF image formats only...?
> 
> You've got it Thomas. When you specify an integer rather than 'all' you 
> are asking the 'filter' and 'transmit' keywords to modify an indexed 
> image's filter / transmit value for a particular index 'n'. This is not 
> possible with non-indexed images (probably not too, where indexes are 
> out of range).
> 
> Several image formats support internal formats using indexes / tables of 
> color/grey values. I'm unsure of the complete, working / supported list 
> for POV-Ray? The gif format is always indexed and it's certainly one 
> which works.
> 
> Bill P.

Thank you Bill. I suspected something like this but it has been such a 
long time since I last manipulated gif-format images that the info had 
become ghost-like in my mind...

-- 
Thomas

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