This is interesting! Looks like you can control this mode of compression via so-called "graphics extension blocks". Maybe we should respect this directly in the GIF reader?




https://graphicdesign.stackexchange.com/a/114301

Von: Squeak-dev <squeak-dev-bounces at lists.squeakfoundation.org> im Auftrag von Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>
Gesendet: Samstag, 13. Juni 2020, 23:39
An: The general-purpose Squeak developers list
Betreff: Re: [squeak-dev] The Trunk: MorphicExtras-kfr.275.mcz

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.gifTry 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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