b3ta.com board
You are not logged in. Login or Signup
Home » Messageboard » Message 4606290 (Thread)

# They're scanlines
they half look nice but at the same time they whack a load off the filesize since the optimisation doesn't have as many different coloured pixels to work with.
(I helped save b3ta! Shuya Nanahara Sayonara, Sun 8 May 2005, 0:09, archived)
# to add to that
scanlines don't always have to be horizontal, they can be vertical or even diagonal (making it look more like you're looking through a screen, sometimes it looks better, sometimes it doesn't,)

but diagonal lines don't always cut off as much filesize as horizontals. ah well.
(I helped save b3ta! AgentMuu hentai coordination, Sun 8 May 2005, 0:12, archived)
# Good point.
Never tried it those ways. Just horizontal. Must give it a go sometime for effect's sake ;)
also I think someone posted a link the other night to a PS plugin that does it all for you after you tweak some sliders a bit.
(I helped save b3ta! Shuya Nanahara Sayonara, Sun 8 May 2005, 0:15, archived)
# Gif compression is horizontal (top left to bottom right, moving horizontally first)
and it does quite well at compressing runs of one colour. But it doesn't actually use run-length encoding as some people will tell you. So I've always thought there should be other alternatives to horizontal scanlines, that should work just as well. It's only looking for repeated patterns, after all.
Possibly dashed horizontal lines might work well. In theory the scanlines could be made out of some kind of repeating coloured pattern, if that was in any way desirable.
(_Felix 's school of dance and occult sciences, Sun 8 May 2005, 0:18, archived)
# I've noticed
while using gif movie gear that you can optimise so that repeated, non moving parts are completely removed from the animation. If you look at it frame by frame there's a lot missing. It doesn't affect the animation in any way other than file size but it's a pain should you need to turn the gif back into individual frames again.
(I helped save b3ta! Shuya Nanahara Sayonara, Sun 8 May 2005, 0:22, archived)
# i've wondered if there was a way to do that with imageready
(I helped save b3ta! AgentMuu hentai coordination, Sun 8 May 2005, 0:24, archived)
# Yes,
tick "transparency" on the optimise palette.
Uses transparency to avoid repeating things in subsequent frames.

(from imageready help)
To optimize an animated image:

1. Choose Optimize Animation from the Animation palette menu.
2. Set the following options:
* Bounding Box to crop each frame to the area that has changed from the preceding frame. Animation files created using this option are smaller but are incompatible with GIF editors that do not support the option. (This option is selected by default and is recommended.)
* Redundant Pixel Removal to make transparent all pixels in a frame that are unchanged from the preceding frame. This option is selected by default and is recommended. The Transparency option in the Optimize palette must be selected for redundant pixel removal to work. (See Optimization options for GIF and PNG-8 formats.)

Important: Set the frame disposal method to Automatic when using the Redundant Pixel Removal option.
(_Felix 's school of dance and occult sciences, Sun 8 May 2005, 0:25, archived)