Yes.
But other animated gifs may use transparency for transparency.
Like this:
http://bestanimations.com/Animals/Birds/Penguins/linux-penguin-animation.gif

I guess one could guess that if the first image does not  contain
transparent colors but a later one does, all images should draw opaque.

Best,
Karl

On Sat, Jun 13, 2020 at 11:39 PM Nicolas Cellier <
nicolas.cellier.aka.nice at gmail.com> wrote:

> Ah you mean first image is opaque, then following ones use transparency
> for non moving parts?
>
> Le sam. 13 juin 2020 à 23:31, karl ramberg <karlramberg at gmail.com> a
> écrit :
>
>> Look at this gif:
>> http://bestanimations.com/Nature/spring/tulips-spring-nature-gif-6.gif
>> Try toggling transparency on and off in the menu
>>
>> Best,
>> Karl
>>
>>
>>
>>
>> On Sat, Jun 13, 2020 at 11:06 PM Jakob Reschke <forums.jakob at resfarm.de>
>> wrote:
>>
>>> I don't understand. I thought most gifs used transparency for
>>> transparency and compression is independent from that.
>>>
>>>
>>> karl ramberg <karlramberg at gmail.com> schrieb am Sa., 13. Juni 2020,
>>> 18:28:
>>>
>>>> Most GIFs use transparenty for  compression. So the general use case is
>>>> that you want it opaque. You can turn off transparency in the menu
>>>>
>>>> Best,
>>>> Karl
>>>>
>>>> On Sat, 13 Jun 2020 at 15:26, Stéphane Rollandin <
>>>> lecteur at zogotounga.net> wrote:
>>>>
>>>>> > what's your motivation for this commit? I think transparent gifs
>>>>> should
>>>>> > be displayed transparently in Squeak. You can always add an opaque
>>>>> > background in your application if it does not want this :-)
>>>>>
>>>>> Indeed.
>>>>>
>>>>> +1
>>>>>
>>>>>
>>>>
>>>
>>
>
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